JP2023032473A - Light-emitting device and lighting fixture with them - Google Patents

Abstract

To provide a light-emitting device and a lighting fixture, capable of improving a color reproducibility of a vision target.SOLUTION: A light-emitting device comprises: a light emitting element having an emission peak wavelength within a range of 430nm or more and 470nm or less; and a fluorescent member. The fluorescent member contains: at least one kind of rare-earth aluminate fluophors selected from a group of a first rare-earth aluminate fluophor having a composition expressed by a formula (I) and a second rare-earth aluminate fluophor having a composition expressed by a formula (II); at least one kind of fluoride fluophors selected from a group of a first fluoride fluophor having a composition expressed by a formula (III) and a second fluoride fluophor having a composition expressed by a formula (IV); and at least two kinds of nitride fluophors selected from nitride fluophors having a composition contained in the composition formula expressed by a formula (V). The light-emitting device emits light of which a value Qa calculated by TLCI-2012 recommended by EBU is 90 or more, and light of which the value Q10 is 90 or more.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present disclosure relates to a light emitting device and a lamp having the same.

A light-emitting device using a light-emitting element called a light-emitting diode (hereinafter also referred to as “LED”) includes, for example, a light-emitting device that combines an LED that emits blue light and a phosphor that emits yellow light. This is a light-emitting device that emits white light by mixing blue light from a blue LED and yellow light emitted from a phosphor excited by the light.

A light-emitting device that combines a light-emitting element that emits blue light and a phosphor that emits yellow light has a high radiant intensity in the visible light region, and thus has high luminous efficiency. Furthermore, there are cases where a light-emitting device with a high general color rendering index, which is an index of how colors appear (color rendering properties) of an illuminated object, is required.

In accordance with JIS Z8726, the color rendering property evaluation procedure of a light source is the color difference ΔEi (i is from 1 to 15) when test colors (R1 to R15) having predetermined reflectance characteristics are measured with a test light source and a reference light source. Integer) is calculated by numerical calculation. Here, the upper limit of the color rendering index Ri (i is an integer from 1 to 15) is 100. That is, the smaller the color difference between the test light source and the corresponding color temperature reference light source, the higher the color rendering.

In relation to the above, a light emitting device with good color reproducibility has been proposed using an LED that emits blue light and two types of phosphors that emit yellow to green light (see, for example, Patent Document 1).

Japanese Patent Publication No. 2003-535477

Even if a visual target is illuminated using a light-emitting device with good color reproducibility, when the visual target is photographed by a camera such as a television camera, broadcasted, and displayed on a screen that receives the broadcast, the viewer can see through the screen. Color reproducibility of visual objects may not be maintained.

One aspect of the present disclosure is to provide a light-emitting device capable of improving color reproducibility of a visual target and a lamp including the same.

The present disclosure includes the following aspects.
A first aspect is a light-emitting device comprising a light-emitting element having an emission peak wavelength in the range of 430 nm or more and 470 nm or less, and a fluorescent member, wherein the fluorescent member has a composition represented by the following formula (I): and at least one rare earth aluminate phosphor selected from the group consisting of a first rare earth aluminate phosphor having a composition represented by the following formula (II): A salt phosphor, a first fluoride phosphor having a composition included in a composition formula represented by the following formula (III), and a second fluoride having a composition included in a composition formula represented by the following formula (IV) At least one fluoride phosphor selected from the group consisting of phosphors and at least two nitrides selected from nitride phosphors having a composition included in the composition formula represented by the following formula (V) A phosphor and a TLCI value Qa calculated by the Television Lighting Consistency Index (TLCI)-2012 recommended by the European Broadcasting Union (EBU) is 90 or more, and the value Q10 This is a light-emitting device that emits light with a λ of 90 or more.
_{Lu3Al5O12 :} Ce( _I )
_{Y3 (} Al1 _{-aGaa ) 5O12} :Ce (II)
(In formula (II), a satisfies 0≤a≤0.5.)
_{Ac [} ^M21 _- bMn4 ⁺ _bFd ] (III)
(In formula (III), A contains at least one selected from the group consisting of K ⁺ , Li ⁺ , Na ⁺ , Rb ⁺ , Cs ⁺ and NH ₄ ⁺ ; M ² is a Group 4 element and containing at least one element selected from the group consisting of Group 14 elements, b satisfies 0<b<0.2, and c is the [M ²¹ _-b Mn ⁴⁺ _b F _d ] ion is the absolute value of electric charge, and d satisfies 5<d<7.)
A'c _' [ ^M2'1 _-b'Mn4 ⁺ _{b'Fd '} ] (IV)
(In formula (IV), A' includes at least one selected from the group consisting of K ⁺ , Li ⁺ , Na ⁺ , Rb ⁺ , Cs ⁺ and NH ₄ ⁺ , and M ² ' is Group 4 At least one element selected from the group consisting of elements, group 13 elements and group 14 elements, b' satisfies 0<b'<0.2, and c' is [M ^2' _{1 -b'} Mn ⁴⁺ _b' F _d' ] is the absolute value of the charge of the ion, and d' satisfies 5<d'<7.)
_{SrqCasAltSiuNv : Eu ( V} )
(In formula (V), q, s, t, u and v are 0 ≤ q < 1, 0 < s ≤ 1, q + s ≤ 1, 0.9 ≤ t ≤ 1.1, 0.9 ≤ u ≤ 1.1, 2.5 ≤ v ≤ 3.5 are satisfied.)

A second aspect is a lamp including the light emitting device.

According to one aspect of the present disclosure, it is possible to provide a light-emitting device capable of improving color reproducibility of a visual target and a lamp including the same.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows an example of the light-emitting device which concerns on embodiment. FIG. 5 is a diagram showing values Q10 of the light emitting devices according to Examples 1 to 6 and the light emitting devices according to Comparative Examples 1 to 6, which emit light of each correlated color temperature; 3A and 3B are diagrams showing an emission spectrum of a light emitting device according to Example 1, an emission spectrum of a light emitting device according to Comparative Example 1, and a spectrum of a reference light source with a correlated color temperature of 6500K; FIG. 11 shows the emission spectrum of a light emitting device according to Example 2, the emission spectrum of a light emitting device according to Comparative Example 2, and the spectrum of a reference light source with a correlated color temperature of 5000K; 10A and 10B are diagrams showing an emission spectrum of a light emitting device according to Example 3, an emission spectrum of a light emitting device according to Comparative Example 3, and a spectrum of a reference light source with a correlated color temperature of 4000K; FIG. FIG. 10 shows the emission spectrum of a light emitting device according to Example 4, the emission spectrum of a light emitting device according to Comparative Example 4, and the spectrum of a reference light source with a correlated color temperature of 3500K; FIG. 11 shows the emission spectrum of a light emitting device according to Example 5, the emission spectrum of a light emitting device according to Comparative Example 5, and the spectrum of a reference light source with a correlated color temperature of 3000K. FIG. 11 shows the emission spectrum of a light emitting device according to Example 6, the emission spectrum of a light emitting device according to Comparative Example 6, and the spectrum of a reference light source with a correlated color temperature of 2700K.

Hereinafter, a light-emitting device according to the present disclosure and a lamp including the same will be described based on embodiments. However, the embodiments shown below are for embodying the technical idea of the present invention, and the present invention is not limited to the following. In this specification, the relationship between color names and chromaticity coordinates, and the relationship between wavelength ranges of light and color names of monochromatic light conform to JIS Z8110. The content of each component in the composition means the total amount of the plurality of substances present in the composition unless otherwise specified when there are multiple substances corresponding to each component in the composition. The average particle size of the phosphor is a numerical value called Fisher Sub Sieve Sizer's No., which is measured using an air permeation method.

Light-Emitting Device A light-emitting device includes a light-emitting element having an emission peak wavelength in the range of 430 nm or more and 470 nm or less, and a fluorescent member. The fluorescent member includes a first rare earth aluminate phosphor having a composition included in the composition formula represented by the following formula (I) and a second rare earth phosphor having a composition included in the composition formula represented by the following formula (II) At least one rare earth aluminate phosphor selected from the group consisting of aluminate phosphors, a first fluoride phosphor having a composition included in the composition formula represented by the following formula (III), and the following formula A fluoride phosphor containing at least one selected from the group consisting of a second fluoride phosphor having a composition included in the composition formula represented by (IV), and a composition formula represented by the following formula (V) and at least two nitride phosphors selected from nitride phosphors having a composition contained in. In addition, the light emitting device is recommended by the European Broadcasting Union (hereinafter referred to as "EBU") according to the Television Lighting Consistency Index (hereinafter referred to as "TLCI")-2012. Light having a calculated TLCI value Qa of 90 or more and a value Q10 of 90 or more is emitted.

_{Lu3Al5O12 :} Ce( _I )
_{Y3 (} Al1 _{-aGaa ) 5O12} :Ce (II)
_{Ac [} ^M21 _- bMn4 ⁺ _bFd ] (III)
A'c _' [ ^M2'1 _-b'Mn4 ⁺ _{b'Fd '} ] (IV)
_{SrqCasAltSiuNv : Eu ( V} )

In formula (II), a satisfies 0≤a≤0.5.
In formula (III), A contains at least one selected from the group consisting of K ⁺ , Li ⁺ , Na ⁺ , Rb ⁺ , Cs ⁺ and NH ₄ ⁺ , and M ² is a Group 4 element and It contains at least one element selected from the group consisting of Group 14 elements, A is preferably K ⁺ and M ² is preferably Si. b satisfies 0<b<0.2, c is the absolute value of the charge of the [M ² _1-b Mn ⁴⁺ _b F _d ] ion, and d satisfies 5<d<7. A composition included in the compositional formula represented by formula (III) may be expressed as, for example, K ₂ SiF ₆ :Mn (hereinafter also referred to as “KSF”).
In formula (IV), A' includes at least one selected from the group consisting of K ⁺ , Li ⁺ , Na ⁺ , Rb ⁺ , Cs ⁺ and NH ₄ ⁺ , and M ² ' is a Group 4 element , and at least one element selected from the group consisting of Group 13 elements and Group 14 elements, A is preferably K ⁺ and M ² is preferably Si and Al. b′ satisfies 0<b′<0.2, c′ is the absolute value of the charge of the [M ^2′ _1-b′ Mn ⁴⁺ _b′ F _d′ ] ion, and d′ is 5 <d'<7 is satisfied. As a composition that is included in the composition formula represented by formula (IV) and contains Si and Al, for example, a composition that is also described as “KSAF” can be mentioned.
In formula (V), q, s, t, u and v are 0≤q<1, 0<s≤1, q+s≤1, 0.9≤t≤1.1, 0.9≤u≤ 1.1, 2.5≤v≤3.5. In addition, as a composition included in the compositional formula represented by the formula (V), for example, (Sr, Ca)AlSiN ₃ :E
u (hereinafter also referred to as “SCASN”) and CaAlSiN ₃ :Eu (hereinafter also referred to as “CASN”).

TLCI (also abbreviated as “Q”)-2012 recommended by the EBU is a visual target that is an illuminated object, for example, captured by a television camera and broadcasted, and the illuminated object when projected on the screen that receives the broadcast. It is a color rendering index. In addition, when shooting with a portable camera and displaying the shooting content on the screen of the mobile camera, or shooting with a computer camera and displaying the shooting content on the screen of the computer display, the above "Q" , can be the color rendering index of the illuminated object. The higher the TLCI value Q, the higher the color reproducibility. The TLCI value Q calculated according to TLCI-2012 recommended by the EBU has a test sample from Q1 to Q24 in which 6 patches of each color of 24 colors are arranged in 4 rows. The value Qa is the average value from Q1 to Q18. The TLCI value Q calculated by the TLCI-2012 is sometimes referred to as the TLCI value Q. The upper limit of each of Q1 to Q24 of TLCI is 100. The closer each value of Q1 to Q24 of TLCI is to 100, the more excellent color reproducibility the image of the illuminated object projected on the screen is. The TLCI test samples included grayscales Q19 through Q24 with a value of White Q19, and the grayscales were not included in the TLCI analysis. The TLCI value Q10 is a value representing purple. The higher the value Qa, which is the average value of TLCI Q1 to Q18, the more light is emitted with improved color reproducibility of the visual object regardless of how the visual object is viewed.

By having the above structure, the light-emitting device suppresses an emission spectrum of bluish-violet to blue in the range of 430 nm or more and 470 nm or less in the emission spectrum of the light-emitting device so that it does not have a high intensity. The emission intensity of the emission spectrum in the wavelength region can be greatly improved. In particular, in the emission spectrum of the light-emitting device, only the emission spectrum in the blue-violet to blue wavelength region is suppressed so as not to have a high intensity, and the emission spectrum in the yellow to green emission wavelength region is approximated by the reference light source. , it is possible to increase the luminous component of green luminescence with high luminosity, so that it is possible to achieve excellent color rendering properties and high luminous efficiency. By using a red-emitting fluoride phosphor and two kinds of nitride phosphors, the light-emitting device can greatly improve the emission intensity near 650 nm in the emission spectrum of the light-emitting device. The light-emitting device uses a fluoride phosphor to maintain high luminous efficiency, and further uses two kinds of nitride phosphors to achieve a TLCI value Qa of 90 or more and a value Q10 of 90 or more. It can emit some light. The light emitting device emits light with a TLCI value Qa of 90 or more, preferably emits light with a value Qa of 91 or more, more preferably emits light with a value Qa of 92 or more, and the value Qa is 93. It is particularly preferable to emit light that is above. The upper limit of the value Qa of light emitted from the light emitting device is 100, and the light emitting device may emit light with a TLCI value Qa of 100 or less, or may emit light with a TLCI value Qa of 99 or less. good. The light-emitting device emits light with a TLCI value Q10 of 90 or more, preferably emits light with a TLCI value Q10 of 91 or more, more preferably emits light with a TLCI value Q10 of 92 or more, and the value Q10 is 93. It is particularly preferable to emit light that is above. Note that the upper limit of the value Q10 of light emitted from the light emitting device is 100, and the light emitting device may emit light with a TLCI value Q10 of 100 or less, or may emit light with a TLCI value Q10 of 99 or less. good. A light-emitting device that emits mixed white light with a high color rendering property and is used for general illumination tends to have a TLCI value Q10 of less than 90. When the TLCI value Q10 shows a high numerical value of 90 or more, the value Qa, which is the average value of Q1 to Q18 including the value Q10, also shows a high numerical value of 90 or more, close to 100, and is displayed on the screen. Also, light with improved color reproducibility is emitted. The value Qa, which is the average of Q1 to Q24 and Q1 to Q18 of the TLCI recommended by the EBU, is based on the TLCI-2012 recommended by the EBU ("TECH 3355 METHOD FOR THE ASSESSMENT OF THE COLORIMETRIC PROPERTIES OF (TLCI-2012) AND THE TELEVISION LUMINAIRE MATCHING FACTOR (TLMF-2013)", Euorpean Broadcasting Union, Geneva, March, 2017).

It is preferable that the light-emitting device emit light that is excellent in the appearance of an irradiated object (hereinafter also referred to as “color rendering”).
The procedure for evaluating the color rendering properties of light emitted from a light source such as a light emitting device is based on JIS Z8726, in which test colors (R1 to R15) having predetermined reflectance characteristics are measured using a test light source and a reference light source. It is determined that the color rendering index is calculated by numerically calculating the color difference ΔEi (where i is an integer from 1 to 15). The upper limit of the color rendering index Ri (i is an integer from 1 to 15) is 100. The smaller the color difference between the test light source and the corresponding color temperature reference light source, the higher the color rendering index, approaching 100. Of the color rendering indices, the average value of R1 to R8 is defined as a general color rendering index (hereinafter also referred to as “Ra”), and R9 to R15 are defined as special color rendering indices. In 1986, the CIE (International Commission on Illumination) published guidelines for color rendering that fluorescent lamps should possess. 60 or more and less than 80 in factories that carry out color rendering; 80 or more and less than 90 in houses, hotels, restaurants, shops, offices, schools, hospitals, and factories that perform precision work; 90 or more.

The light-emitting device emits light with Ra of 80 or more, preferably Ra of 90 or more, and more preferably Ra of 92 or more. In addition, the light emitting device preferably emits light with a higher R15 value, preferably 85 or more R15, more preferably 90 or more R15, and more preferably 92 R15. It is more preferable to emit light having R15 of 93 or more, and it is particularly preferable to emit light having R15 of 93 or more.

The light emitted by the light-emitting device is a mixed color of the light emitted by the light-emitting element and the fluorescence emitted by each of the phosphors described above. and light within the range of y = 0.20 to 0.50, and light within the range of x = 0.30 to 0.50 and y = 0.30 to 0.45 can also
The correlated color temperature of light emitted by the light emitting device can be, for example, 2000K or higher, or can be 2500K or higher. Also, the correlated color temperature can be 7000K or less.

A light-emitting device 100, which is an example of a light-emitting device, will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing a light emitting device 100. FIG.
The light-emitting device 100 has a light-emitting element 10 made of a gallium nitride-based compound semiconductor having an emission peak wavelength in the range of 430 nm or more and 470 nm or less, and a molded body 40 on which the light-emitting element 10 is mounted. The molded body 40 is formed by integrally molding the first lead 20, the second lead 30, and a resin portion 42 containing a thermoplastic resin or a thermosetting resin. The molded body 40 forms a recess having a bottom surface and a side surface, and the light emitting element 10 is placed on the bottom surface of the recess. The light emitting element 10 has a pair of positive and negative electrodes, and the pair of positive and negative electrodes are electrically connected to the first lead 20 and the second lead 30 via wires 60, respectively. The light emitting element 10 is covered with a fluorescent member 50 . The fluorescent member 50 includes, for example, a rare earth aluminate phosphor 71, a fluoride phosphor 72, and two kinds of nitride phosphors 73 as phosphors 70 for wavelength-converting light from the light emitting element 10, and a resin. Contain. The phosphor 70 contained in the fluorescent member 50 may contain two or more phosphors.

The fluorescent member 50 not only converts the wavelength of the light emitted by the light emitting element 10, but also functions as a member for protecting the light emitting element 10 from the external environment. In FIG. 1, the phosphors 70 are unevenly distributed in the phosphor member 50 . By arranging the phosphor 70 close to the light emitting element 10 in this way, the wavelength of the light from the light emitting element 10 can be efficiently converted, and a light emitting device with excellent luminous efficiency can be obtained. In addition, the arrangement of the fluorescent member 50 including the fluorescent substance 70 and the light emitting element 10 is not limited to a form in which they are arranged close to each other. The light-emitting element 10 and the phosphor 70 can be arranged in the space 50 . Further, by mixing the phosphor 70 in the entire fluorescent member 50 at a substantially uniform ratio, it is possible to obtain light with more suppressed color unevenness.

Light-emitting element The light-emitting element has an emission peak wavelength in the range of 430 nm or more and 470 nm or less, and from the viewpoint of luminous efficiency and color rendering properties, preferably has an emission peak wavelength in the range of 440 nm or more and 465 nm or less. It is more preferable to have an emission peak wavelength within the following range, more preferably have an emission peak wavelength within a range of 445 nm or more and 460 nm or less, even if it has an emission peak wavelength within a range of 450 nm or more and 460 nm or less good. Using such a light-emitting element as an excitation light source, a light-emitting device that emits mixed-color light of light from the light-emitting element and fluorescence from the phosphor is configured.

The full width at half maximum of the emission spectrum indicating the maximum emission intensity of the light emitting element may be, for example, 30 nm or less.
As the light emitting element, it is preferable to use, for example, a semiconductor light emitting element using a nitride-based semiconductor. By using a semiconductor light-emitting element as a light source, it is possible to obtain a stable light-emitting device with high efficiency, high output linearity with respect to input, and resistance to mechanical impact.
In this specification, the full width at half maximum refers to the wavelength width at which the emission intensity is 50% of the emission intensity at the emission peak wavelength showing the maximum emission intensity in the emission spectrum.

The phosphor light-emitting device includes at least one phosphor that absorbs part of the light emitted from the light-emitting element and emits light of a wavelength different from that of the light emitted from the light-emitting element, thereby reducing the luminous flux of the light-emitting device. can be increased while increasing the TLCI value Qa.

Rare earth aluminate phosphor The first rare earth aluminate phosphor having a composition included in the compositional formula represented by the formula (I) has an emission peak wavelength in the emission spectrum of 500 nm or more and 540 nm or less, It is preferable to include a first rare earth aluminate phosphor having a full width at half maximum of 95 nm or more and 105 nm or less. A first rare earth aluminate phosphor having a composition included in the compositional formula represented by the formula (I), wherein the emission peak wavelength in the emission spectrum is in the range of 500 nm or more and 540 nm or less, and the full width at half maximum is 95 nm or more. The first rare earth aluminate phosphor having a wavelength of 105 nm or less includes, for example, a rare earth aluminate phosphor denoted as LAG.

The second rare earth aluminate phosphor having a composition included in the compositional formula represented by the formula (II) has an emission peak wavelength in the emission spectrum of the second rare earth aluminate phosphor in the range of 520 nm or more and 550 nm or less. and a full width at half maximum of 95 nm or more and 115 nm or less. A second second compound having a composition included in the composition formula represented by the formula (II), having an emission peak wavelength in the range of 520 nm or more and 550 nm or less in the emission spectrum, and having a full width at half maximum of 95 nm or more and 115 nm or less The third rare earth aluminate phosphor contained in the rare earth aluminate phosphor includes rare earth aluminate phosphors denoted as GYAG1 or GYAG2 having different emission peak wavelengths and full widths at half maximum.

The second rare earth aluminate phosphor having a composition included in the compositional formula represented by the formula (II) has an emission peak wavelength in the emission spectrum of the second rare earth aluminate phosphor in the range of 535 nm or more and 555 nm or less. and a full width at half maximum of 100 nm or more and 120 nm or less. A second second compound having a composition included in the composition formula represented by the formula (II), an emission peak wavelength in the emission spectrum of 535 nm or more and 555 nm or less, and a full width at half maximum of 100 nm or more and 120 nm or less. The fourth rare earth aluminate phosphor contained in the rare earth aluminate phosphor includes a rare earth aluminate phosphor denoted as YAG.

The maximum excitation wavelength of the rare earth aluminate phosphor is preferably in the range of 380 nm or more and 490 nm or less, more preferably 430 nm or more and 470 nm or less, and 440 nm or more and 460 nm or less, in consideration of luminous efficiency. is more preferably within the range of

The average particle diameter of the rare earth aluminate phosphor is, for example, in the range of 5 μm or more and 30 μm or less, and in the range of 20 μm or more and 25 μm or less, in consideration of the improvement of luminous intensity and workability in the manufacturing process of the light emitting device. is preferred. The light-emitting device may contain a single rare earth aluminate phosphor, or may contain a combination of two or more rare earth aluminate phosphors having different compositions. Hereinafter, the average particle size of the phosphor refers to the cumulative 50% particle size (volume average particle size) in the volume-based particle size distribution measured by the laser diffraction particle size distribution measurement method. The volume average particle diameter can be measured using a laser diffraction particle size distribution analyzer (MASTER SIZER 3000, manufactured by MALVERN), and is a volume average particle diameter measured by a laser diffraction particle size distribution measurement method. If there is, it may be a catalog value.

Fluoride phosphor The first fluoride phosphor having a composition included in the composition formula represented by the formula (III) has an emission peak wavelength in the emission spectrum of the first fluoride phosphor in the range of 620 nm or more and 640 nm or less. It is preferable that the first fluoride phosphor is included in. A first fluoride phosphor having a composition included in the composition formula represented by the formula (III), having an emission peak wavelength in the range of 620 nm or more and 640 nm or less in an emission spectrum, and having a full width at half maximum of 14 nm or less , and KSF.

The second fluoride phosphor having a composition included in the compositional formula represented by the formula (IV) has an emission peak wavelength in the emission spectrum of the second fluoride phosphor in the range of 620 nm or more and 640 nm or less. It preferably contains a fluoride phosphor. A second fluoride phosphor having a composition included in the composition formula represented by the formula (IV), having an emission peak wavelength in the range of 620 nm or more and 640 nm or less in an emission spectrum, and having a full width at half maximum of 14 nm or less , and KSAF.

The full width at half maximum in the emission spectrum of the fluoride phosphor is preferably small, and may be, for example, 10 nm or less. The full width at half maximum in the emission spectrum of the fluoride phosphor may be, for example, 1 nm or more. The maximum excitation wavelength of the fluoride phosphor is preferably in the range of 430 nm or more and 470 nm or less, and more preferably in the range of 440 nm or more and 460 nm or less, in consideration of luminous efficiency.

The average particle size of the fluoride phosphor may be, for example, in the range of 5 μm or more and 50 μm or less, and may be in the range of 10 μm or more and 30 μm or less, in consideration of the improvement of the light emission intensity and workability in the manufacturing process of the light emitting device. preferable. The light-emitting device may contain a single fluoride phosphor, or may contain a combination of two or more fluoride phosphors having different compositions.

Nitride phosphor Nitride phosphor having a composition included in the compositional formula represented by the formula (V) has an emission peak wavelength in the range of 600 nm or more and 630 nm or less in the emission spectrum of the nitride phosphor. It preferably contains a nitride phosphor having a full width of 80 nm or less, and examples thereof include a nitride phosphor denoted by SCASN. The nitride phosphor may have a full width at half maximum of 40 nm or more in the emission spectrum. The nitride phosphor contains at least one selected from the group consisting of Sr and Ca, and preferably contains both Sr and Ca. It is more preferable to have

The nitride phosphor having a composition included in the composition formula represented by the formula (V) has an emission peak wavelength in the range of 640 nm or more and 680 nm or less in the emission spectrum of the nitride phosphor, and a full width at half maximum of 100 nm or less. and a nitride phosphor denoted by CASN, for example. The third nitride phosphor may have a full width at half maximum of 40 nm or more in the emission spectrum.

Considering luminous efficiency, the excitation wavelength of the nitride phosphor preferably has a peak intensity within the range of 380 nm or more and 490 nm or less, more preferably 430 nm or more and 470 nm or less, and 440 nm or more and 460 nm or less. is more preferably within the range of

The average particle size of the nitride phosphor is, for example, in the range of 5 μm or more and 35 μm or less, and preferably in the range of 15 μm or more and 25 μm or less, in consideration of the improvement of the light emission intensity and workability in the manufacturing process of the light emitting device. preferable.
The light-emitting device has a composition included in the compositional formula represented by the formula (V) and contains two or more kinds of nitride phosphors having different emission peak wavelength ranges or different full widths at half maximum.

Other Phosphors The light-emitting device may optionally contain phosphors other than the rare earth aluminate phosphors, fluoride phosphors, and nitride phosphors described above. Other phosphors include (Sr, Ba, Ca) ₁₀ (PO ₄ ) ₆ (Br, Cl) ₂ :Eu, (Y, Gd, Tb, Lu) ₃ (Al, Ga) ₅ O ₁₂ :Ce ( However, excluding the first rare earth aluminate phosphor _{and the} second rare earth aluminate phosphor _{) , Ca3Sc2Si3O12} :Ce, _{CaSc2O4 :} Ce, (La, Y) _{3Si6 N11} :Ce, (Ca, _{Sr ,} Ba) _{3Si6O9N4 :Eu, (Ca,Sr,Ba)3Si6O12N2 : Eu , (} Ba _, Sr,Ca) _{Si2O2 N2} :Eu, ( _Ca ,Sr,Ba) _2Si5N8 :Eu, (Ca,Sr,Ba)S:Eu, (Ba,Sr,Ca) _Ga2S4 :Eu and the _like can be mentioned _. . When the light-emitting device contains other phosphors, the content thereof is appropriately adjusted so as to obtain specific light-emitting properties.

A commercially available phosphor can be used as the phosphor. Further, for example, a fluoride phosphor can be manufactured by referring to the manufacturing methods described in Japanese Patent Application Nos. 2014-202266 and 2020-212532 previously filed by the applicant. Further, other phosphors can be produced, for example, as follows. Elements contained in the composition of the phosphor, oxides, carbonates, nitrides, chlorides, fluorides, sulfides, and the like are used as raw materials, and these raw materials are weighed so as to obtain a predetermined composition ratio. Further, additive materials such as flux are added to the raw materials as appropriate, and the mixture is wet- or dry-mixed using a mixer. This makes it possible to promote the solid phase reaction and form particles of uniform size. Further, as the mixer, in addition to a ball mill that is usually used industrially, a pulverizer such as a vibration mill, a roll mill, and a jet mill may be used. The specific surface area can be increased by pulverizing with a pulverizer. In addition, in order to keep the specific surface area of the obtained phosphor particles within a certain range, a settling tank, a hydrocyclone, a wet separator such as a centrifugal separator, a dry classification such as a cyclone, an air separator, etc., which are usually used industrially, etc. can also be used for classification. The above mixed raw materials are packed in a crucible such as SiC, quartz, alumina, BN, etc., and fired in an inert atmosphere such as argon or nitrogen or a reducing atmosphere containing hydrogen. Firing is performed at a predetermined temperature and time. The calcined material is pulverized, dispersed, filtered, and the like to obtain the target phosphor powder. Solid-liquid separation can be carried out by a method commonly used industrially, such as filtration, suction filtration, pressure filtration, centrifugation, decantation, and the like. Drying can be carried out by means of an apparatus commonly used industrially, such as a vacuum dryer, a hot-air heating dryer, a conical dryer, a rotary evaporator, and the like.

In order to increase the TLCI value Qa and the value Q10, the content rate of each of the phosphors described above is adjusted according to the desired correlated color temperature of the light emitted by the light emitting device, as described in (1) to (5) below. You may choose to

(1) Content ratio of total content of fluoride phosphor to total content of rare earth aluminate phosphor The content ratio of the total content (mass) of the fluoride phosphor to the total content (mass) of the phosphor (total content of fluoride phosphor/total content of rare earth aluminate phosphor) is 0.35 or more It is preferably within the range of 0.70 or less, more preferably within the range of 0.40 or more and 0.65 or less, and further preferably within the range of 0.42 or more and 0.60 or less. Hereinafter, the content of the phosphor refers to mass.

In the case of a light emitting device that emits light with a correlated color temperature in the range of 2500 K or more and less than 4750 K, the content ratio of the total content of fluoride phosphors to the total content of rare earth aluminate phosphors (total content of fluoride phosphors content/total content of rare earth aluminate phosphor) is preferably within the range of 0.60 or more and 1.30 or less, more preferably within the range of 0.65 or more and 1.20 or less, More preferably, it is in the range of 0.68 or more and 1.00 or less.

(2) Content ratio of total content of fluoride phosphor to total content of rare earth aluminate phosphor, fluoride phosphor and nitride phosphor Emit light with a correlated color temperature in the range of 4750K or more and 7000K or less In the case of a light emitting device, the content ratio of the total content of the fluoride phosphor to the total content of the rare earth aluminate phosphor, fluoride phosphor and nitride phosphor (total content of fluoride phosphor/rare earth aluminum total content of acid salt phosphor, fluoride phosphor and nitride phosphor) is preferably in the range of 0.25 or more and 0.45 or less, and is in the range of 0.26 or more and 0.40 or less. is more preferable, and more preferably within the range of 0.28 or more and 0.34 or less.

In the case of a light emitting device that emits light with a correlated color temperature in the range of 2500 K or more and less than 4750 K, the total content of fluoride phosphors relative to the total content of rare earth aluminate phosphors, fluoride phosphors and nitride phosphors (total content of fluoride phosphor/total content of rare earth aluminate phosphor, fluoride phosphor and nitride phosphor) is in the range of 0.35 or more and 0.60 or less It is preferably in the range of 0.36 or more and 0.55 or less, and more preferably in the range of 0.38 or more and 0.53 or less.

(3) Content ratio of total content of rare earth aluminate phosphor to total content of rare earth aluminate phosphor, fluoride phosphor and nitride phosphor Light with a correlated color temperature in the range of 4750K or more and 7000K or less In the case of a light-emitting device that emits Total content/total content of rare earth aluminate phosphor, fluoride phosphor and nitride phosphor) is preferably in the range of 0.50 or more and 0.75 or less, and 0.60 or more and 0.72 It is more preferably within the following range, and further preferably within the range of 0.62 or more and 0.70 or less.

In the case of a light-emitting device that emits light with a correlated color temperature in the range of 2500 K or more and less than 4750 K, the total content of rare earth aluminate phosphors relative to the total content of rare earth aluminate phosphors, fluoride phosphors, and nitride phosphors Content ratio (total content of rare earth aluminate phosphor/total content of rare earth aluminate phosphor, fluoride phosphor and nitride phosphor) is in the range of 0.40 or more and 0.60 or less is preferably in the range of 0.45 or more and 0.59 or less, and more preferably in the range of 0.50 or more and 0.58 or less.

(4) Content ratio of total content of fluoride phosphor and nitride phosphor to total content of rare earth aluminate phosphor, fluoride phosphor and nitride phosphor Correlated color temperature range of 4750K or more and 7000K or less In the case of a light emitting device that emits light within, the content ratio of the total content of the fluoride phosphor and nitride phosphor to the total content of the rare earth aluminate phosphor, fluoride phosphor and nitride phosphor (fluorine The total content of the compound phosphor and the nitride phosphor/the total content of the rare earth aluminate phosphor, the fluoride phosphor and the nitride phosphor) is in the range of 0.25 or more and 0.50 or less. It is preferably in the range of 0.28 or more and 0.45 or less, and more preferably in the range of 0.30 or more and 0.40 or less.

In the case of a light emitting device that emits light with a correlated color temperature in the range of 2500 K or more and less than 4750 K, the total content of the rare earth aluminate phosphor, the fluoride phosphor and the nitride phosphor relative to the fluoride phosphor and nitride phosphor The content ratio of the total content of the body (total content of fluoride phosphor and nitride phosphor / total content of rare earth aluminate phosphor, fluoride phosphor and nitride phosphor) is 0.40 or more 0 It is preferably within the range of 0.60 or less, more preferably within the range of 0.41 or more and 0.55 or less, and further preferably within the range of 0.42 or more and 0.50 or less.

(5) Content ratio of total content of fluoride phosphor to total content of fluoride phosphor and nitride phosphor The content ratio of the total content of the fluoride phosphor to the total content of the fluoride phosphor and the nitride phosphor (total content of the fluoride phosphor/total content of the fluoride phosphor and the nitride phosphor) is 0 It is preferably within the range of 0.80 or more and 0.99 or less, more preferably within the range of 0.85 or more and 0.98 or less, and further preferably within the range of 0.90 or more and 0.95 or less. preferable.

In the case of a light emitting device that emits light with a correlated color temperature in the range of 2500 K or more and less than 3250 K, the content ratio of the total content of the fluoride phosphor with respect to the total content of the fluoride phosphor and the nitride phosphor (fluoride fluorescence (total content of solids/total content of fluoride phosphor and nitride phosphor) is preferably in the range of 0.80 or more and 0.95 or less, and in the range of 0.82 or more and 0.93 or less more preferably 0.85 or more and 0.92 or less.

Emission Spectrum The emission spectrum of a light-emitting device is represented by a spectral distribution having wavelength on the horizontal axis and emission intensity on the vertical axis. In the emission spectrum of the light-emitting device, the emission peak intensity ratio of the emission peak of the fluoride phosphor to the emission peak of the light-emitting element is determined according to the correlated color temperature intended for the light-emitting device in order to increase the TLCI values Qa and Q10. It is preferable to select
In the case of a light-emitting device that emits light with a correlated color temperature in the range of 4750K to 7000K, the emission peak intensity ratio of the emission peak of the fluoride phosphor to the emission peak of the light-emitting element in the emission spectrum of the light-emitting device is 1. It is preferably within the range of 00 or more and 2.00 or less, more preferably within the range of 1.10 or more and 1.80 or less, and further preferably within the range of 1.20 or more and 1.70 or less. .

In the case of a light-emitting device that emits light with a correlated color temperature in the range of 3250K or more and less than 4750K, the emission peak intensity ratio of the emission peak of the fluoride phosphor to the emission peak of the light-emitting element in the emission spectrum of the light-emitting device is 2. It is preferably within the range of 00 or more and 4.50 or less, more preferably within the range of 2.20 or more and 4.00 or less, and further preferably within the range of 2.50 or more and 3.75 or less. .

In the case of a light emitting device that emits light with a correlated color temperature in the range of 2850 K or more and less than 3250 K, the emission peak intensity ratio of the emission peak of the fluoride phosphor to the emission peak of the light emitting element in the emission spectrum of the light emitting device is 4. It is preferably within the range of 00 or more and 6.00 or less, more preferably within the range of 4.20 or more and 5.50 or less, and further preferably within the range of 4.80 or more and 5.40 or less. .

When the light emitting device emits light with a correlated color temperature in the range of 2500 K or more and less than 2850 K, the emission peak intensity ratio of the emission peak of the fluoride phosphor to the emission peak of the light emitting element in the emission spectrum of the light emitting device is 5. It is preferably within the range of 50 or more and 9.00 or less, more preferably within the range of 6.00 or more and 8.50 or less, and further preferably within the range of 7.00 or more and 8.40 or less. .

Fluorescent Member The light-emitting device includes, for example, a fluorescent member that contains a phosphor and a resin and covers the light-emitting element. Thermoplastic resins and thermosetting resins are examples of resins that constitute the fluorescent member. Specific examples of thermosetting resins include epoxy resins, silicone resins, and modified silicone resins such as epoxy-modified silicone resins.

The fluorescent member may optionally contain other components in addition to the fluorescent material and resin. Other components include fillers such as silica, barium titanate, titanium oxide and aluminum oxide, light stabilizers, colorants and the like. When the fluorescent member contains other components, the content thereof is not particularly limited and can be appropriately selected according to the purpose. For example, when a filler is included as another component, the content thereof can be in the range of 0.01% by mass or more and 60% by mass or less with respect to the resin.

Lamp The lamp should include at least one of the light emitting devices described above. Furthermore, the lamp may be equipped with a combination of at least one of the light emitting devices described above and a known light emitting device that emits mixed white light. In addition to the light emitting device described above, the lamp may further include a reflecting member, a protective member, a device for supplying power to the light emitting device, and the like. Note that the lamp may include a plurality of the light emitting devices described above. When the lamp has a plurality of light emitting devices, it may have a plurality of identical light emitting devices, or may have a plurality of light emitting devices with different correlated color temperatures, for example. Further, a driving device may be provided that can individually drive a plurality of light emitting devices to adjust brightness and correlated color temperature according to preference. The lighting fixture may be used in any of a direct mounting type, an embedded type, and a hanging type.

Examples of the present disclosure will be specifically described below.

Phosphor Before manufacturing the light-emitting device, the following phosphors were prepared as phosphors used in Examples and Comparative Examples.
First rare earth aluminate phosphor: LAG, an emission peak wavelength of 521 nm and a full width at half maximum of 100 nm in the emission spectrum of the first rare earth aluminate phosphor,
Second rare earth aluminate phosphor: GYAG1, an emission peak wavelength of 535 nm and a full width at half maximum of 106 nm in the emission spectrum of the second rare earth aluminate phosphor,
Second rare earth aluminate phosphor: GYAG2, an emission peak wavelength of 541 nm and a full width at half maximum of 107 nm in the emission spectrum of the second rare earth aluminate phosphor,
Second rare earth aluminate phosphor: YAG, an emission peak wavelength of 546 nm and a full width at half maximum of 110 nm in the emission spectrum of the second rare earth aluminate phosphor,
First fluoride phosphor: KSF, an emission peak wavelength of 630 nm in the emission spectrum of the first fluoride phosphor, a full width at half maximum of 14 nm,
Nitride phosphor: SCASN, an emission peak wavelength in the range of 600 nm or more and 630 nm or less in the emission spectrum of the nitride phosphor, full width at half maximum of 80 nm,
Nitride phosphor: CASN, an emission peak wavelength in the range of 640 nm or more and 680 nm or less in the emission spectrum of the nitride phosphor, full width at half maximum of 100 nm.

Furthermore, as a phosphor used in the light emitting device of the comparative example, chlorosilicate fluorescence having a composition included in the composition formula represented by the following formula (VI), an emission peak wavelength of 521 nm, and a half width of 63 nm prepared the body.
_{Ca8MgSi4O16Cl12 : Eu (} VI)
The emission peak wavelength and full width at half maximum of each phosphor described above can be adjusted by changing the production conditions and composition of the phosphor.

A gallium nitride-based semiconductor light-emitting device having an emission peak wavelength of 450 nm was prepared as the light-emitting device.

Examples 1 to 6
Fabrication of Light-Emitting Device A light-emitting element having an emission peak wavelength of 450 nm was combined with any one of LAG, GYAG1, GYAG2, YAG, KSF, SCASN, and CASN as shown in Table 1, and a phosphor was produced. A light-emitting device including a fluorescent member including The "-" symbol in the table indicates that the corresponding phosphor is not included or there is no corresponding unit value.
Each phosphor and the content of each phosphor are adjusted to the values shown in Table 2 below so that the correlated color temperature is around each of the correlated color temperatures of 6500K, 5000K, 4000K, 3500K, 3000K and 2700K. , the phosphor-containing resin composition was obtained by adding the blended phosphor to the silicone resin, mixing and dispersing the mixture, and then defoaming. Next, this phosphor-containing resin composition was injected and filled on the light emitting element, and the resin composition was cured by heating to produce a fluorescent member. A light-emitting device was manufactured through such steps.

Comparative Examples 1 to 6
Fabrication of Light-Emitting Device A light-emitting element having an emission peak wavelength of 450 nm was combined with any of the GYAG2, SCASN, and chlorosilicate phosphors without containing a fluoride phosphor as shown in Table 2, and the phosphor was A light-emitting device including a fluorescent member including
Each phosphor and the content of each phosphor were adjusted to the values shown in Table 4 below so that the correlated color temperature is around each of the correlated color temperatures of 6500K, 5000K, 4000K, 3500K, 3000K and 2700K. A light-emitting device was fabricated in the same manner as the light-emitting devices according to Examples 1 to 6, except for the above.

Each light emitting device according to the example and each light emitting device according to the comparative example were measured as follows. The results are shown in Tables 3 and 4.

Emission Peak Intensity Ratio The emission spectrum of each light emitting device according to Examples and each light emitting device according to Comparative Example was measured using a spectrofluorophotometer. Also, from the emission spectrum of the light emission from each light emitting device, the emission peak intensity ratio of the emission peak intensity of the emission peak of the fluoride phosphor around 630 nm to the emission peak intensity of the emission peak of the light emitting element around 450 nm was determined. 3 to 8 show the emission spectrum of each light emitting device according to Examples 1 to 6 and each light emitting device according to Comparative Examples 1 to 6 and the spectrum of the reference light source at each correlated color temperature. The emission spectrum of each light emitting device and the spectrum of the reference light source shown in FIGS.

Correlated color temperature, chromaticity coordinates (x, y), color rendering index (Ra, R15), relative luminous flux (%)
The chromaticity coordinates of the emitted color, the correlated color temperature (K), the general color rendering index (Ra), and the special color rendering index (R15) were measured for each light emitting device according to the example and each light emitting device according to the comparative example. Specifically, for each light-emitting device used in Examples and Comparative Examples, a light measurement system combining a spectrophotometer (PMA-12, Hamamatsu Photonics Co., Ltd.) and an integrating sphere was used to measure the color of the CIE 1931 chromaticity diagram. Chromaticity coordinates (x, y), correlated color temperature (K), general color rendering index Ra, special color rendering index R15 and luminous flux in the degree coordinate system were measured. The relative luminous flux of light emitted from each light-emitting device according to the example was obtained by setting the luminous flux of each light-emitting device according to the comparative example at each correlated color temperature as 100%.

TLCI value Qa, value Q10
Each light-emitting device according to the example and each light-emitting device according to the comparative example was measured by EBU as described above using an optical measurement system combining a spectrophotometer (PMA-12, Hamamatsu Photonics Co., Ltd.) and an integrating sphere. Based on the formula described in the recommended TLCI-2012, the TLCI values Qa and Q10 were calculated.

As shown in Tables 3 and 4, when comparing the average color change index Ra and the TLCI value Qa of the light emitting devices of Examples and Comparative Examples having substantially the same correlated color temperature, the average color rendering index Ra Almost the same values were obtained in Examples and Comparative Examples. On the other hand, for the TLCI value Qa, the light emitting device of the example obtained a higher numerical value than the comparative example at each correlated color temperature. Also, regarding R15, at each correlated color temperature, the light emitting device of the example obtained a higher numerical value than that of the comparative example. It can be seen that the light emitting device of the example has a high TLCI value Qa, and emits light with improved color reproducibility of the visual object regardless of how the visual object is viewed. Also, as shown in Tables 3 and 4, the relative luminous flux of each light-emitting device of the example is determined by using the luminous flux of each comparative example as a reference (100%), and the light-emitting device of the example having substantially the same correlated color temperature. When comparing the light emitting devices of the comparative example and the comparative example, a high luminous flux was obtained in each of the light emitting devices of the examples.
From the above, it can be seen that the light emitting device according to the example has a high luminous flux, improved color reproducibility of a visual target, and excellent color rendering.

FIG. 2 is a diagram showing Q10 of TLCI of a light emitting device of an example and a light emitting device of a comparative example which emit light having approximately the same correlated color temperature. As shown in FIG. 2, at each correlated color temperature, each light-emitting device of each example emitted light having a value Q10 higher than that of each light-emitting device of the comparative example, and having a value Q10 of 90 or more.

3 to 8 show the emission spectrum of the light emitting device according to the example, the emission spectrum of the light emitting device according to the comparative example, and the emission spectrum of the reference light source at each correlated color temperature.
In the emission spectra of the light emitting devices of Examples 1 to 6, the emission intensity of the emission peak in the range of 430 nm or more and 470 nm or less is The color balance was maintained without exceeding the luminescence intensity of the reference light source and without the luminescence intensity of bluish-purple to blue being significantly high. The light emitting devices according to Examples 1 to 6 had a high TLCI value Q10 of 90 or more, and emitted light with a high TLCI value Qa of 90 or more while maintaining the color balance of each color.

In the emission spectra of the light emitting devices of Comparative Examples 1 to 6, the emission intensity of the emission peak in the range of 430 nm or more and 470 nm or less is The emission intensity of the reference light source is equal to or exceeds the emission intensity of the reference light source, the emission intensity of bluish purple to blue color increases, the color balance is lost, the TLCI value Q10 decreases, and the correlated color temperature Some speculated that the TLCI value Qa would be lower than 90.

The light-emitting device of the present disclosure can be used for lighting fixtures, LED displays, camera flashlights, and the like, which have excellent light-emitting properties. Furthermore, it can be used as a lamp equipped with this light emitting device.

10: Light emitting element, 50: Fluorescent member, 70: Phosphor, 71: Rare earth aluminate phosphor, 72: Fluoride phosphor, 73: Nitride phosphor, 100: Light emitting device.

Claims (14)

A light-emitting device comprising a light-emitting element having an emission peak wavelength in the range of 430 nm or more and 470 nm or less, and a fluorescent member,
The fluorescent member includes a first rare earth aluminate phosphor having a composition included in a composition formula represented by the following formula (I) and a second rare earth aluminate phosphor having a composition included in a composition formula represented by the following formula (II) at least one rare earth aluminate phosphor selected from the group consisting of rare earth aluminate phosphors;
A group consisting of a first fluoride phosphor having a composition included in the composition formula represented by the following formula (III) and a second fluoride phosphor having a composition included in the composition formula represented by the following formula (IV) at least one fluoride phosphor selected from
At least two nitride phosphors having a composition included in the composition formula represented by the following formula (V),
Emitting light having a value Qa of 90 or more and a value Q10 of 90 or more calculated according to the Television Lighting Consistency Index (TLCI)-2012 recommended by the European Broadcasting Union (EBU); Luminescent device.
_{Lu3Al5O12 :} Ce( _I )
_{Y3 (} Al1 _{-aGaa ) 5O12} :Ce (II)
(In formula (II), a satisfies 0≤a≤0.5.)
_{Ac [} ^M21 _- bMn4 ⁺ _bFd ] (III)
(In formula (III), A contains at least one selected from the group consisting of K ⁺ , Li ⁺ , Na ⁺ , Rb ⁺ , Cs ⁺ and NH ₄ ⁺ ; M ² is a Group 4 element and containing at least one element selected from the group consisting of Group 14 elements, b satisfies 0<b<0.2, and c is the [M ²¹ _-b Mn ⁴⁺ _b F _d ] ion is the absolute value of electric charge, and d satisfies 5<d<7.)
A'c _' [ ^M2'1 _-b'Mn4 ⁺ _{b'Fd '} ] (IV)
(In formula (IV), A' includes at least one selected from the group consisting of K ⁺ , Li ⁺ , Na ⁺ , Rb ⁺ , Cs ⁺ and NH ₄ ⁺ , and M ² ' is Group 4 At least one element selected from the group consisting of elements, group 13 elements and group 14 elements, b' satisfies 0<b'<0.2, and c' is [M ^2' _{1 -b'} Mn ⁴⁺ _b' F _d' ] is the absolute value of the charge of the ion, and d' satisfies 5<d'<7.)
_{SrqCasAltSiuNv : Eu ( V} )
(In formula (V), q, s, t, u and v are 0 ≤ q < 1, 0 < s ≤ 1, q + s ≤ 1, 0.9 ≤ t ≤ 1.1, 0.9 ≤ u ≤ 1.1, 2.5 ≤ v ≤ 3.5 are satisfied.) The content ratio of the total content of the fluoride phosphor to the total content of the rare earth aluminate phosphor is
When the correlated color temperature emits light within the range of 4750 K or more and 7000 K or less, it is within the range of 0.35 or more and 0.70 or less,
2. The light emitting device according to claim 1, wherein the correlated color temperature is in the range of 0.60 to 1.30 when emitting light in the range of 2500K or more and less than 4750K. The content ratio of the total content of the fluoride phosphor to the total content of the rare earth aluminate phosphor, the fluoride phosphor and the nitride phosphor is
When the correlated color temperature emits light within the range of 4750 K or more and 7000 K or less, it is within the range of 0.25 or more and 0.45 or less,
2. The light-emitting device according to claim 1, wherein the correlated color temperature is in the range of 0.35 to 0.60 when emitting light in the range of 2500K or more and less than 4750K. The content ratio of the total content of the rare earth aluminate phosphor to the total content of the rare earth aluminate phosphor, the fluoride phosphor and the nitride phosphor is
When the correlated color temperature emits light within the range of 4750 K or more and 7000 K or less, it is within the range of 0.50 or more and 0.75 or less,
2. The light emitting device according to claim 1, wherein the correlated color temperature is in the range of 0.40 to 0.60 when emitting light in the range of 2500K or more and less than 4750K. The content ratio of the total content of the fluoride phosphor and the nitride phosphor to the total content of the rare earth aluminate phosphor, the fluoride phosphor and the nitride phosphor is
When the correlated color temperature emits light within the range of 4750 K or more and 7000 K or less, it is within the range of 0.25 or more and 0.50 or less,
2. The light emitting device according to claim 1, wherein the correlated color temperature is in the range of 0.40 to 0.60 when emitting light in the range of 2500K or more and less than 4750K. The content ratio of the total content of the fluoride phosphor with respect to the total content of the fluoride phosphor and the nitride phosphor is
When the correlated color temperature emits light within the range of 3250 K or more and 7000 K or less, it is within the range of 0.80 or more and 0.99 or less,
2. The light-emitting device according to claim 1, wherein the correlated color temperature is in the range of 0.80 to 0.95 when emitting light in the range of 2500K to 3250K. The emission peak intensity ratio of the emission peak of the fluoride phosphor to the emission peak of the light emitting element in the emission spectrum of the light emitting device is
When the correlated color temperature emits light within the range of 4750 K or more and 7000 K or less, it is within the range of 1.00 or more and 2.00 or less,
When the correlated color temperature emits light within the range of 3250 K or more and less than 4750 K, it is in the range of 2.00 or more and 4.00 or less,
When the correlated color temperature emits light within the range of 2850 K or more and less than 3250 K, it is in the range of 4.00 or more and 6.00 or less,
2. The light-emitting device according to claim 1, wherein the correlated color temperature is in the range of 5.50 to 9.00 when emitting light in the range of 2500K or more and less than 2850K. The light-emitting device according to any one of claims 1 to 7, wherein the light-emitting element has an emission peak wavelength within a range of 440 nm or more and 460 nm or less. The first rare earth aluminate phosphor includes a first rare earth aluminate phosphor having an emission peak wavelength in the range of 500 nm or more and 540 nm or less in an emission spectrum and a full width at half maximum of 95 nm or more and 105 nm or less. The light emitting device according to any one of claims 1 to 8. The second rare earth aluminate phosphor includes a third rare earth aluminate phosphor having an emission peak wavelength in the range of 520 nm or more and 550 nm or less in an emission spectrum and a full width at half maximum of 95 nm or more and 115 nm or less. The light emitting device according to any one of claims 1 to 8. The second rare earth aluminate phosphor includes a fourth rare earth aluminate phosphor having an emission peak wavelength in the range of 535 nm or more and 555 nm or less in an emission spectrum and a full width at half maximum of 100 nm or more and 120 nm or less. The light emitting device according to any one of claims 1 to 8. 12. The nitride phosphor according to any one of claims 1 to 11, wherein the nitride phosphor includes a nitride phosphor having an emission peak wavelength in the range of 600 nm or more and 630 nm or less in an emission spectrum and a full width at half maximum of 80 nm or less. Luminescent device. 13. The nitride phosphor according to any one of claims 1 to 12, wherein the nitride phosphor includes a nitride phosphor having an emission peak wavelength in the range of 640 nm or more and 680 nm or less in an emission spectrum and a full width at half maximum of 100 nm or less. Luminescent device. A lamp comprising the light emitting device according to any one of claims 1 to 13.

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