JP2000182568A - Fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent lamp in which clearness of a color of an object to be illuminated can be enhanced without any increase in the kinds of phosphor materials used. SOLUTION: A glass tube is provided at the inner surface thereof with a phosphor layer made of a mixture phosphor including mainly a blue phosphor having a light emitting peak wavelength of 440-470 nm, a red phosphor having a light emitting peak wavelength of 600-670 nm and a green phosphor containing therein at least bivalent manganese and trivalent terbium as a light emitting center and having a ratio IMn/ITb of a light emitting peak height IMn by the bivalent manganese to a light emitting peak height ITb by the trivalent terbium being 0.1 or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp.

[0002]

2. Description of the Related Art In recent years, as fluorescent lamps for general lighting, three-wavelength band fluorescent lamps using a mixture of phosphors having emission peaks in blue, green and red have been mainly used for lighting of houses and stores. Many are used.

The three-wavelength band fluorescent lamp is a rare-earth phosphor whose emission center is an ion of a rare-earth element. A commonly used phosphor is europium-activated aluminate. Barium / magnesium blue phosphor, europium-activated barium / calcium / strontium / magnesium blue phosphor,
Cerium / terbium activated lanthanum phosphate green phosphor, terbium activated cerium / magnesium aluminate green phosphor, europium activated yttrium oxide red phosphor, and the like. Rare earth phosphors are expensive, but calcium halophosphate phosphor Ca ₁₀ (PO ₄ ) _{6 that} emits white light by itself.
Since a fluorescent lamp with a higher luminous flux and higher color rendering can be obtained than in the case where FCl: Sb, Mn is used as the phosphor layer, a three-wavelength band fluorescent lamp using this rare earth phosphor is widely spread and generally used. Has become.

[0004] In this three-wavelength band fluorescent lamp,
Attempts have been made to make the colors of illuminated objects look more vivid. For example, it is often the case that the appearance of the color of an object when illuminated by a lamp is more vividly improved by further adding light emission in a specific wavelength range to three general light emissions of blue, green and red. It has been reported. 6
Deep red wavelength range of 20 nm or more, or 500 to 53
A green wavelength range of 5 nm or the like is known as a typical wavelength range that makes the color appearance of an object more vivid when added to the three light emissions of blue, green, and red.

[0005]

However, in order to achieve the purpose of improving the color vividness of an illuminated object, the common blue, green, and red colors used in three-wavelength band fluorescent lamps are used. In addition to a total of three types of phosphor materials that emit light at a time, it is necessary to use a phosphor material that emits light in a specific wavelength range that improves the vividness of the color appearance of at least one or more types of objects.

When manufacturing a fluorescent lamp for improving the vividness of the color appearance of such an object, the lamp manufacturing process becomes more complicated due to the increase in the types of phosphor materials, and the manufacturing cost increases. Is an unavoidable problem.

The present invention has been made to solve the above problems, and can improve the vividness of the color appearance of an illuminated object without increasing the types of phosphor materials used. It is an object to provide a fluorescent lamp.

[0008]

A fluorescent lamp according to the present invention comprises:
A blue phosphor having an emission peak wavelength of 440 to 470 nm, a red phosphor having an emission peak wavelength of 600 to 670 nm, and a green phosphor containing at least divalent manganese and trivalent terbium as emission centers; And the ratio I _Mn / I _Tb of the peak height I _Mn of light emission by divalent manganese to the peak height I _Tb of light emission by trivalent terbium is
A fluorescent lamp characterized in that a phosphor layer composed of a mixed phosphor containing 0.1 or more green phosphor as a main component is formed on the inner surface of a glass tube.

As a result, a fluorescent lamp capable of improving the vividness of the color appearance of an illuminated object without increasing the types of phosphor materials used is obtained.

According to a second aspect of the present invention, in the fluorescent lamp according to the first aspect, the ratio I _Mn / I _Tb is 0.1 to 0.1.
It has a configuration within the range of 1.0.

As a result, it is possible to improve the vividness of the color appearance of the illuminated object without increasing the types of phosphor materials to be used, and to obtain a fluorescent lamp having a particularly preferable color appearance.

According to a third aspect of the present invention, in the fluorescent lamp according to the first or second aspect, the blue phosphor is activated by divalent europium or divalent europium.
The red phosphor is activated by trivalent europium or 2 or more.
It has a configuration composed of at least one kind of red phosphor activated with manganese or tetravalent manganese.

By using these phosphor materials, it is possible to improve the vividness of the color appearance of the illuminated object without increasing the types of phosphor materials used.

According to a fourth aspect of the present invention, in the fluorescent lamp according to any one of the first to third aspects, the green phosphor containing at least divalent manganese and trivalent terbium as luminescent centers is used. Is a divalent manganese, trivalent terbium-activated aluminate phosphor having a general formula (Ce _{1-a
Tb a) 2 O 3 · x} (Mg 1-b Mn b) O · yAl 2 O 3 ( however, 0.05 ≦ a ≦ 0.6,0 <b ≦ 0.3,1.6
≦ x ≦ 2.4, 8 ≦ y ≦ 16).

As a result, a green phosphor activated with divalent manganese and trivalent terbium is obtained, and the color appearance of the illuminated object is increased without increasing the types of phosphor materials used. Can be improved.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Whether or not the colors of an object can be seen vividly when illuminated by a lamp is generally evaluated by a so-called visual evaluation, in which a space illuminating an object of various colors is observed with the actual eyes. . By this luminous evaluation, it is possible to judge the relative vividness of the vividness of the color appearance of the lamp having various light colors and spectral distributions.

On the other hand, an index that quantitatively indicates the vividness of the color appearance of the illuminated object can also be used to determine the level of the vividness of the color appearance of the lamp.

As a well-known index indicating vividness, there is a color gamut area ratio (symbol: Ga) described in JIS Z 8726-1990. This is because, when eight test colors Nos. 1 to 8 used for calculating the average color rendering index Ra are illuminated by a certain test light source, the visible colors are plotted on a CIE1964U ^* V ^* uniform color space, respectively. It compares the area of an octagon formed on coordinates by connecting two chromaticity points.

FIG. 1 is a diagram plotting chromaticity points when eight test colors are illuminated by a certain test light source in a CIE1964U ^* V ^* uniform color space.

The area of an octagon formed by connecting eight points in the CIE 1964 U ^* V ^* uniform color space is a reference light source (dotted line in FIG. 1) having the same correlated color temperature as the test light source (shown by a solid line in FIG. 1). And Ga = (area of octagon created by test light source) / (area of octagon created by reference light source)
It is calculated by × 100. Note that the reference light source described here is black body radiation having the same correlated color temperature as the test light source, or C
IE combined daylight.

Number 1 used to calculate Ga
The ~ 8 test colors are medium vivid color samples with various hues, all of which have Munsell values of 6. Therefore, Ga is used as an index of average vividness for all colors, and if Ga is 100 or more, it means that the saturation is averagely higher than the reference light source, that is, the vividness is increased. I do.

Therefore, in the present invention, a number of analyzes were performed on the relationship between the color vividness of an illuminated object and the spectral spectrum of a fluorescent lamp. Ga was used as an index indicating the vividness and was visually observed. Used together with the feeling evaluation.

The fluorescent lamp of the present invention comprises a blue phosphor having an emission peak wavelength of 440 to 470 nm, a red phosphor having an emission peak wavelength of 600 to 670 nm, divalent manganese and trivalent terbium. And the ratio I _Mn / I _Tb of the peak height I _Mn of light emission by divalent manganese to the peak height I _Tb of light emission by trivalent terbium is 0.1 or more. This is a fluorescent lamp in which a phosphor layer made of a mixed phosphor containing a certain green phosphor as a main component is formed on the inner surface of a glass tube.
In addition to blue light emission of about 460 nm, green light emission of about 540 to 570 nm, and red light emission of about 600 to 670 nm, 50 emission due to divalent manganese of a green phosphor.
By adding an appropriate amount of light emission in the vicinity of 0 to 535 nm, it is possible to obtain a fluorescent lamp capable of improving the vividness of the color appearance of an illuminated object without increasing the types of phosphor materials used.

According to one embodiment of the present invention, europium-activated barium calcium strontium halophosphate is used.
21% by weight of magnesium blue phosphor, 39% by weight of europium-activated yttrium oxide red phosphor, I _Mn / I
_A manganese / terbium-activated cerium / magnesium aluminate green phosphor having a _Tb of 0.33 was used in an amount of 40% by weight.
A fluorescent lamp having a chromaticity deviation of 0 from the locus of the black body on the uv chromaticity diagram (hereinafter, referred to as a product of the present invention) was produced.

FIG. 2 shows the spectrum of the product of the present invention.
At the same time, two europium-activated barium / calcium / strontium / magnesium blue phosphors were used.
2% by weight, 34% by weight of europium-activated yttrium oxide red phosphor, terbium-activated cerium aluminate
A conventional general three-wavelength band fluorescent lamp manufactured using 44% by weight of a magnesium green phosphor and having the same light color was manufactured for comparison (hereinafter, referred to as a comparative product).

Visual evaluation of the space in which objects of various colors illuminated by the product of the present invention existed revealed that various colors could be illuminated more vividly. The color gamut area ratio Ga was 114.2, and the comparative product Ga = 105.7.
Greatly exceeded.

The product of the present invention has an emission peak wavelength of 440 to 440.
Europium-activated halophosphate barium calcium strontium magnesium blue phosphor to 470nm blue light _{((BaCaSrMg) 10 (PO 4} ) 6: Eu)
Is converted to a europium-activated yttrium oxide red phosphor (Y) for emitting red light having an emission peak wavelength of 600 to 670 nm.
₂ O ₃ : Eu) as a green phosphor and changing the composition
A manganese-terbium-activated cerium magnesium aluminate green phosphor in which the ratio I _Mn / I _Tb of the peak height I _Mn of light emission by trivalent manganese to the peak height I _Tb of light emission by trivalent terbium is varied. Used to make fluorescent lamps of various light colors.

FIG. 3 shows that the correlated color temperature is 3000K, 500.
In a fluorescent lamp of 0K and 7000K, the ratio I of the peak height I _Mn of light emission by divalent manganese of the used green phosphor to the peak height I _Tb of light emission by trivalent terbium is used.
And _Mn / I _Tb, shows the relationship between the increase in the number ΔGa of Ga with respect to the fluorescent lamp of the comparison that the same light color.

As is apparent from FIG. 3, in the fluorescent lamps having any correlated color temperature, ΔGa increases as I _Mn / I _Tb of the green phosphor used together with the blue phosphor and the red phosphor increases. You can see that Further, it can be seen from FIG. 3 that the increase rate of ΔGa varies depending on the correlated color temperature of the fluorescent lamp to be manufactured. This is thought to be because the fluorescent lamp of the present invention uses a phosphor layer containing blue, green, and red phosphors as main components, but the mixing ratio of each phosphor differs depending on the correlated color temperature. Can be

Further, when a space in which objects of various colors illuminated by these fluorescent lamps exist was evaluated by visual evaluation, the colors of the objects appeared more vivid as I _Mn / I _Tb increased.

As a result of detailed observation, a correlation was found between the index Ga, which quantitatively indicates vividness, and the actual visual evaluation,
At ΔGa = 2.5 or more, it was confirmed that various colors appeared more vivid than the comparative product.

In the present invention, in the color temperature region of a general fluorescent lamp, the green phosphor used together with the blue phosphor and the red phosphor, which satisfies ΔGa = 2.5.
_Mn / _ITb was determined to be greater than or _equal to 0.1.

When I _Mn / I _Tb of the green phosphor used together with the blue phosphor and the red phosphor is 0.1 or more, the effect of the present invention can be obtained, and the type of the phosphor material used is not increased. Thus, a fluorescent lamp is obtained in which the vividness of the color appearance of the illuminated object is improved.

As a result of further analysis, ΔGa increases as I _Mn / I _Tb increases, and the color of the illuminated object increases, but the increase of Ga is particularly in the range of 2.5 ≦ ΔGa ≦ 15. It has been found favorable. Even if ΔGa exceeds 15, the vividness increases and the effect of the present invention can be obtained. However, depending on the illuminated object such as an object with a subtle hue, the vividness is strongly felt when the vividness is increased to a certain degree or more. It may look unnatural. Therefore, the color vividness is improved, and the range in which the color appearance is particularly preferable is 2.5 ≦ ΔGa
It was determined to be in the range of ≦ 15.

In the present invention, in the color temperature range of a general fluorescent lamp, I _Mn / I _Tb of the green phosphor used together with the blue phosphor and the red phosphor that satisfies ΔGa = 15 or less is 1. It was determined to be 0 or less.

When the I _Mn / I _Tb of the green phosphor used together with the blue phosphor and the red phosphor is in the range of 0.1 to 1.0, the effect of the present invention can be obtained and the phosphor used can be used. Without increasing the types of materials, the vividness of the color appearance of the illuminated object is improved, and a fluorescent lamp with a particularly favorable color appearance can be obtained.

The present invention has an emission peak wavelength of 440 to 440.
A blue phosphor at 470 nm and an emission peak wavelength of 60
A red phosphor at 0 to 670 nm, a green phosphor containing at least divalent manganese and trivalent terbium as emission centers, and a peak emission height of divalent manganese and an emission peak of trivalent terbium. The fluorescent lamp has a phosphor layer composed of a mixed phosphor mainly composed of a green phosphor and a peak height ratio I _Mn / I _Tb within a predetermined range. In some cases, light emission is added to a specific wavelength range in order to further improve the appearance of colors such as gender. For example, 490 nm
It is well known that the average color rendering index (Ra) can sometimes be increased by adding an appropriate amount of a phosphor having a peak in the vicinity thereof as a phosphor layer together with blue, green and red phosphors. It goes without saying that the above-mentioned means is effective in the present invention and the effect of the present invention is not lost.

The blue phosphor having an emission peak wavelength of 440 to 470 nm for realizing the fluorescent lamp of the present invention is as follows:
What is necessary is just to use the thing made of at least one kind of a bivalent europium activated or divalent europium and divalent manganese activated blue phosphor. As representative phosphors, europium-activated barium / calcium / strontium / magnesium phosphor, europium-activated barium / magnesium aluminate phosphor, europium / manganese-activated barium / magnesium aluminate phosphor, etc. are well known. Have been.

A red phosphor having an emission peak wavelength of 600 to 670 nm for realizing the fluorescent lamp of the present invention is a red phosphor activated by trivalent europium, activated by divalent manganese or activated by tetravalent manganese. At least one kind may be used. As a typical phosphor, a europium-activated yttrium oxide phosphor and the like are well known. If necessary, a europium-activated yttrium oxysulfide phosphor, a manganese-activated cerium / gadolinium borate phosphor, a manganese-activated fluoromagnesium fluoromagnesium phosphor, and the like can also be used in combination.

As a green phosphor for realizing the fluorescent lamp of the present invention, there is a divalent manganese trivalent terbium activated aluminate phosphor. As one phosphor, two emission peaks of emission of about 517 nm by divalent manganese and emission of 543 nm by trivalent terbium are observed. In the present invention, the peak height I _Mn of light emission by divalent manganese of a green phosphor containing at least divalent manganese and trivalent terbium used as an emission center, which is used together with the blue phosphor and the red phosphor, and the trivalent manganese when the ratio I _Mn / I _Tb peak heights I _Tb of the light emission by terbium is within a predetermined range, it is possible to obtain the effect of the present invention, I _Mn / I _Tb of the green phosphor is a phosphor Can be controlled by appropriately setting the contents of divalent manganese and trivalent terbium, which are the luminescent centers of the above.

In general, a phosphor layer formed of a mixed phosphor formed on the inner surface of a fluorescent lamp emits light by receiving the energy of ultraviolet rays emitted from mercury excited by the discharge of the lamp. In a general fluorescent lamp, ultraviolet rays emitted from mercury are mainly ultraviolet rays having a wavelength of 253.7 nm. However, divalent manganese, which is a luminescent center of a green phosphor, for realizing the fluorescent lamp of the present invention and trivalent manganese are used. Terbium both
Due to the energy levels inherent to these ions, the energy of ultraviolet light having a wavelength of 253.7 nm cannot be efficiently absorbed. In a phosphor containing such a luminescent center, ions that function as a sensitizer that efficiently absorbs the energy of ultraviolet light having a wavelength of 253.7 nm are contained in the phosphor composition to transfer energy to the luminescent center. Is generally used, and in a phosphor containing divalent manganese and trivalent terbium as emission centers, trivalent cerium is generally contained as a sensitizer in the phosphor composition.

In the above-described phosphor, since both divalent manganese and trivalent terbium receive energy from trivalent cerium to emit light, the emission spectrum is determined by the content of each other. That is, when the content of manganese is increased, the emission of about 517 nm by divalent manganese is increased, but at the same time, the probability of energy transfer from trivalent cerium to trivalent terbium is reduced. Light emission attenuates. For this reason, in order to obtain a green phosphor having the ratio I _Mn / I _Tb within an appropriate range that can obtain the effect of the present invention, the phosphor crystals of divalent manganese and trivalent terbium should be used. Along with the content,
The control may be performed in consideration of the relative relationship between the contents of divalent manganese and trivalent terbium.

[0043] As the green phosphor to realize a fluorescent lamp of the present invention, specifically the general formula _{(Ce 1-a Tb a)} 2 O 3
_{· X (Mg 1-b Mn} b) O · yAl 2 O 3 ( where 0.0
5 ≦ a ≦ 0.6, 0 <b ≦ 0.3, 1.6 ≦ x ≦ 2.
(4, 8 ≦ y ≦ 16), a divalent manganese trivalent terbium activated aluminate phosphor may be used.

The symbols a, b, x, and y in the general formulas indicate the contents of the compounds constituting the aluminate phosphor, and the respective ranges are designated. This will be described in detail.

In the general formula, the symbol a indicates the content of Tb ₂ O _{3. If} the content is less than a = 0.05, sufficient light emission cannot be obtained, and if the content exceeds 0.6, light emission due to concentration quenching occurs. Since it is remarkably reduced, 0.05 ≦ a ≦ 0.6 is satisfied.

In the general formula, the symbol b indicates the content of MnO, and when the content exceeds b = 0.3, Tb
_{As in} the case of ₂ O ₃ , light emission is significantly reduced by concentration quenching, so that 0 <b ≦ 0.3.

In the general formula, the symbol x indicates the content of MgO, and the symbol y indicates the content of Al ₂ O ₃ .
The symbol x is 1.6 ≦ x ≦ 2.4, and the symbol y is 8 ≦
When y ≦ 16 is satisfied, a phosphor having appropriate emission characteristics can be obtained. On the other hand, when the symbol x is 1.6 ≦ x ≦ 2.4,
When the symbol y does not satisfy 8 ≦ y ≦ 16, both the emission peak height and the luminance are remarkably reduced, and an aluminate phosphor suitable for practical use cannot be obtained.

The general formula _{(Ce 1-a Tb a)} 2 O 3 · x (Mg
_1-b Mn _b ) O.yAl ₂ O ₃ (provided that 0.05 ≦ a ≦
0.6, 0 <b ≦ 0.3, 1.6 ≦ x ≦ 2.4, 8 ≦ y
≦ 16), characterized in that it is represented by the formula:
The trivalent terbium-activated aluminate phosphor can be synthesized as follows. First, as a raw material of the phosphor, (1) Cerium compounds such as cerium oxide and cerium carbonate. (2) Terbium compounds such as terbium oxide and terbium halide. (3) Magnesium compounds such as magnesium oxide, magnesium hydroxide and magnesium carbonate. (4) Manganese compounds such as manganese oxide, manganese carbonate, and manganese halide. (5) Aluminum compounds such as aluminum oxide, aluminum hydroxide, and aluminum halide. Is used.

The above raw materials are weighed, and the mixture is sufficiently pulverized and mixed. This is put in a heat-resistant container such as a crucible made of alumina and fired in air at a temperature of 1100 to 1600 ° C. for several hours. The obtained fired product is once pulverized, put again in a heat-resistant container such as an alumina crucible, and then put in a reducing atmosphere.
Baking at a temperature of 100 to 1600 ° C. for several hours. After crushing the fired product and performing post-treatment such as washing with water, the general formula (Ce) is obtained.
_{1-a Tb a) 2 O} 3 · x (Mg 1-b Mn b) O · yAl 2 O
₃ (However, 0.05 ≦ a ≦ 0.6, 0 <b ≦ 0.3,
1.6 ≦ x ≦ 2.4, 8 ≦ y ≦ 16), whereby a divalent manganese and trivalent terbium-activated aluminate phosphor can be synthesized.

The firing in the air may be repeated several times, and the final firing may be performed in a reducing atmosphere.
If necessary, the sintering in the air may be omitted and only the sintering in the reducing atmosphere may be performed.

Next, an embodiment of the present invention will be described. (Example 1) Europium-activated barium / calcium / strontium / magnesium blue phosphor of halophosphate was treated with 6
Wt%, a europium activated yttrium oxide red phosphor 58 wt%, manganese · I _Mn / I _Tb is 0.64
Using a terbium-activated cerium / magnesium aluminate green phosphor at 36% by weight, a correlated color temperature of 3109K,
A fluorescent lamp having a chromaticity deviation of 0.0011 from the locus of the black body on the CIE 1960uv chromaticity diagram was manufactured.

As Comparative Example 1, 6% by weight of a europium-activated barium / calcium / strontium / magnesium blue phosphor, 53% by weight of a europium-activated yttrium oxide red phosphor, and cerium / magnesium aluminate activated by terbium were used. Using 41% by weight of green phosphor, correlated color temperature of 3093K, CIE1960u
Chromaticity deviation from black body locus on v-chromaticity diagram 0.000
Nine conventional general three-band fluorescent lamps were produced.

The lamp used in the example was the same as the lamp used in the comparative example because of the type of phosphor used.

Using these lamps, the luminous evaluation of the space where objects of various colors exist was made.
Although the lamps of Comparative Example 1 and the lamp of Comparative Example 1 have almost the same light color, the lamp of Example 1 can clearly show the color of the object clearly and favorably as compared with Comparative Example 1. Was. The color gamut area ratio Ga of the lamp of Example 1 was 115.0, and Ga of the lamp of Comparative Example 1 was 107.0.
It greatly exceeded 0.

Therefore, in the fluorescent lamp of the first embodiment,
It was confirmed that a fluorescent lamp capable of improving the color of the illuminated object more vividly was obtained by both the visual evaluation with the actual eyes and an index quantitatively indicating the vividness.

(Example 2) 18% by weight of europium-activated barium magnesium aluminate blue phosphor, 43% by weight of europium-activated yttrium oxide red phosphor, and manganese having an I _Mn / I _Tb of 0.92. 3 terbium activated cerium / magnesium aluminate green phosphor
Using 9% by weight, correlated color temperature 5095K, CIE19
Chromaticity deviation from blackbody locus on 60uv chromaticity diagram-
A 0.0002 fluorescent lamp was produced.

As Comparative Example 2, 20% by weight of europium-activated barium magnesium aluminate blue phosphor and 3% of europium-activated yttrium oxide red phosphor were used.
5% by weight, 45% by weight of a terbium-activated cerium / magnesium aluminate green phosphor, and a correlated color temperature of 5%.
081K, a conventional general three-wavelength fluorescent lamp having a chromaticity deviation of 0.0002 from the locus of the black body on the CIE 1960uv chromaticity diagram was manufactured.

Since the lamps used in the example are the same as the lamps used in the comparative example, the time and effort required for manufacturing the lamps are completely the same.

Using these lamps, visual evaluation was performed on the space where objects of various colors exist.
The lamp of Example 2 and the lamp of Comparative Example 2 have substantially the same light color, but the lamp of Example 2 can clearly show the color of the object clearly and favorably as compared with Comparative Example 2. Was. The color gamut area ratio Ga of the lamp of Example 2 was 117.6, and the lamp of Comparative Example 2 had Ga = 105.
It greatly exceeded 2.

Therefore, in the fluorescent lamp of the second embodiment,
It was confirmed that a fluorescent lamp capable of improving the color of the illuminated object more vividly was obtained by both the visual evaluation with the actual eyes and an index quantitatively indicating the vividness.

Example 3 25% by weight of europium-activated barium magnesium aluminate blue phosphor, 26% by weight of europium-activated yttrium oxide red phosphor, 11% by weight of europium-activated yttrium oxysulfide red phosphor , Manganese / terbium-activated cerium / magnesium aluminate green phosphor having an I _Mn / I _Tb of 0.41 and a correlated color temperature of 6870 K, C
A fluorescent lamp having a chromaticity deviation of 0.0015 from the locus of black body on the IE1960uv chromaticity diagram was manufactured.

As Comparative Example 3, 26% by weight of europium-activated barium magnesium aluminate blue phosphor and 2% of europium-activated yttrium oxide red phosphor were used.
Using 1% by weight, 11% by weight of europium-activated yttrium oxysulfide red phosphor, and 42% by weight of terbium-activated cerium / magnesium aluminate green phosphor, a correlated color temperature of 6891K and a black body on a CIE 1960uv chromaticity diagram A conventional general three-band fluorescent lamp having a chromaticity deviation of 0.0022 from the locus was manufactured.

Since the lamp of the example uses the same kind of phosphor as that of the lamp of the comparative example, the time and labor required for the production were completely the same.

Using these lamps, the luminous evaluation of the space where objects of various colors exist was made.
Although the lamps of Comparative Example 3 and the lamp of Comparative Example 3 have substantially the same light color, the lamp of Example 3 can clearly show the color of the object more clearly and favorably than that of Comparative Example 3. Was. The color gamut area ratio Ga of the lamp of Example 3 was 114.2, and Ga of the lamp of Comparative Example 3 was 103.2.
Greatly exceeded 7.

Therefore, in the fluorescent lamp of the third embodiment,
It was confirmed that a fluorescent lamp that can improve the color of an illuminated object more vividly can be obtained by both the visual evaluation with the actual eyes and an index that quantitatively indicates the vividness.

[0066]

As described above, according to the present invention, it is possible to obtain a fluorescent lamp capable of improving the vividness of the color appearance of an illuminated object without increasing the types of phosphor materials used. Can be. Thus, the present invention is of great industrial value.

[Brief description of the drawings]

FIG. 1 shows CIE1964U ^* illustrating color gamut area ratio Ga
V ^* Uniform color space diagram

FIG. 2 is a spectral distribution diagram of a fluorescent lamp according to one embodiment of the present invention.

FIG. 3 shows correlated color temperatures of 3000K, 5000K, and 7000.
The ratio I _Mn / I _Tb in the fluorescent lamp of the K of the present invention, shows the relationship between the increase in the number ΔGa of Ga with respect to comparative

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09K 11/64 CPM C09K 11/64 CPM 11/73 CPX 11/73 CPX 11/78 CPB 11/78 CPB 11 / 80 CPM 11/80 CPM F-term (reference) 4H001 CA07 XA08 XA13 XA39 YA12 YA25 YA58 YA63 YA65 5C043 AA01 CC09 CD01 CD10 DD28 EA09 EB02 EB04 EC11 EC14

Claims (4)

[Claims] 1. A blue phosphor having an emission peak wavelength of 440 to 470 nm, and a blue phosphor having an emission peak wavelength of 600 to 670 nm.
m, a green phosphor containing at least divalent manganese and trivalent terbium as emission centers, and a peak height I _Mn of light emission by divalent manganese.
When trivalent ratio I _Mn / I _Tb peak heights I _Tb of the light emission by terbium, the phosphor layer comprising a phosphor mixture composed mainly of a green phosphor is 0.1 or more in the glass tube surface A fluorescent lamp characterized by being formed. 2. The method according to claim 1, wherein the ratio I _Mn / I _Tb is 0.1 to 1.0.
The fluorescent lamp according to claim 1, wherein 3. The blue phosphor comprises at least one of divalent europium-activated or divalent europium and divalent manganese-activated blue phosphor, and the red phosphor is trivalent europium-activated or divalent manganese-activated. Live or 4
3. The fluorescent lamp according to claim 1, comprising at least one kind of manganese-activated red phosphor. 4. A green phosphor containing at least divalent manganese and trivalent terbium as emission centers.
Valence manganese, trivalent terbium-activated aluminate phosphor represented by the general formula _{(Ce 1-a Tb a)} 2 O 3 · x (Mg 1-b M
n _b ) O.yAl ₂ O ₃ (provided that 0.05 ≦ a ≦ 0.
6,0 <b ≦ 0.3,1.6 ≦ x ≦ 2.4,8 ≦ y ≦ 1
The fluorescent lamp according to any one of claims 1 to 3, wherein the fluorescent lamp is represented by (6).