JP2000021353A - Fluorescent lamp and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a red color faithfully and vividly visible while restraining reduction in the whole light flux by applying a mixed phosphor by adding a deep red light emitting phosphor by a prescribed quantity to blue, green and red light emitting phosphors having respectively specific light emitting peak wave lengths, to the glass bulb surface. SOLUTION: A phosphor mainly composed of four kinds by mixing a deep red light emitting phosphor such as manganese activating fluorogermanate having the light emitting peak of 650 to 670 nm and a phosphor having 10 to 25% output energy of output energy of a blue light emitting phosphor in blue, green and red light emitting phosphors having respectively the light emitting peaks existing in the vicinity of 440 to 460 nm, 550 to 570 nm and 611 nm, is used as a material constituting a phosphor coating film 4 formed on the inside surface of a bulb 1 of a lamp L. At this time, when a mixing rate of the deep red light emitting phosphor is set to 5 to 30 wt.%, desirably, 10 to 25%, a visible way of a red object can be made vivid, and reduction in the whole light flux can be restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp and a lighting fixture equipped with the fluorescent lamp, which show red, flesh color, etc. more vividly.

[0002]

2. Description of the Related Art Recently, many fluorescent lamps having excellent luminous efficiency and long life have been used in place of incandescent lamps.

[0003] A fluorescent lamp has an electrode in which a coiled tungsten filament coated with an electron-emitting substance is mounted in a glass tube bulb having a phosphor film coated on its inner surface, and a rare gas such as argon for facilitating the start of discharge. Gas and an appropriate amount of mercury are enclosed.

When the electrode (cathode) is preheated by applying an electric current, thermoelectrons are emitted from the filament into the bulb, and the thermoelectrons are attracted by the high pressure of the opposite electrode (anode) and move, so that the thermoelectrons move between the two electrodes. Discharge begins. The electrons moving by the discharge collide with mercury atoms in the bulb to generate ultraviolet rays, and the ultraviolet rays excite a phosphor on the bulb inner surface to emit visible light outside the bulb. Depending on the type of the applied phosphor, daylight colors, daylight whites, warm whites, bulb colors, and the like are obtained.

In general fluorescent lamps, for example, an antimony / manganese-activated halophosphate phosphor is applied to obtain daylight or daylight white color light. In recent years, three wavelengths having improved efficiency and color rendering have been obtained. Fluorescent lamps called shapes are becoming widely used.

This three-wavelength fluorescent lamp is, for example, a europium-activated barium magnesium aluminate phosphor that emits blue light having an emission peak near 450 nm (Japanese Patent Application Laid-open No. Sho.
It is disclosed in detail in JP-A-6-152882. ), Europium-activated barium calcium strontium halophosphate phosphor (disclosed in detail in JP-A-48-33159), cerium terbium-activated lanthanum phosphate emitting a green light having an emission peak near 545 nm. Phosphors (disclosed in JP-A-54-56086), cerium / terbium-activated magnesium aluminate phosphors (disclosed in JP-A-52-22836), and emission peaks Is 611n
A mixture of three colors of fluorescent material such as europium-activated yttrium oxide fluorescent material that emits red light in the vicinity of m is applied in the appropriate ratio and applied to the inside of the bulb. It has an excellent effect of making it look beautiful and bright.

However, a fluorescent lamp having a coating film in which the above-mentioned phosphors are mixed at an appropriate ratio is a red special color rendering index R9.
Has a correlated color temperature of 2600-3150K
(Kelvin) was insufficient when adjusted to the vicinity, and the color tended to look a bit dull when looking closely at red objects.

The lamp which makes this red thing look vivid is
There is a demand for lighting such as interiors such as curtains and rugs (carpets), human skin, fresh food stores such as meat, fish and fruits, and plant appreciation. Equivalent to.

Therefore, the fluorescent substance of this bulb color fluorescent lamp is a deep red phosphor having an emission peak longer than 611 nm. (1) A manganese-activated magnesium fluorogermanate fluorescence having an emission peak near 655 nm. (2) Europium-activated yttrium vanadate phosphor having an emission peak near 619 nm, (3) Europium-activated yttrium vanadate phosphor also having (4) europium-activated yttrium oxysulfide having an emission peak near 626 nm It has been reported that a special color rendering index R9 (red) is improved by adding a phosphor or the like.

[0010] Of the above deep red phosphors, (1)
(2) and (3) have the effect of making the red color more vivid, but the addition significantly reduces the total luminous flux. On the other hand, (4), when used in a lamp, had a problem in practical use because it was blackened early due to liberation of sulfur (S) contained therein.

[0011]

The present inventors have further studied the above-described deep red phosphor, and have obtained the ratio of the output energy intensity with other kinds of phosphor to be mixed, and the acquisition and manufacture of materials among the deep red phosphor. It was further investigated about the addition of the manganese-activated magnesium fluorogermanate phosphor (1), which has the following advantages, and it was found that the special color rendering index can be increased by regulating the material and the amount added.

The present invention has been made on the basis of the above, and has a fluorescent lamp which minimizes a decrease in the total luminous flux while showing the appearance of a red object more faithfully and vividly, and which has no problem in mass production. It is an object to provide a lighting device using a fluorescent lamp.

[0013]

According to a first aspect of the present invention, there is provided a fluorescent lamp comprising: a glass bulb provided with electrodes; and a light emission peak formed on a surface of the bulb having a light emission peak of 440 to 460 n.
m, the first phosphor that emits blue light and has an emission peak of 5
A second phosphor that emits green light at 35 to 570 nm,
The third emission peaking around 611 nm and emitting red light
And a fourth phosphor having an emission peak at 650 to 670 nm, emitting deep red light, and having an output energy of 10 to 25% of the output energy of the first phosphor. It is characterized by comprising a phosphor coating made of a mixed phosphor as a component, and a discharge medium sealed in the bulb.

By adding a predetermined amount of a phosphor emitting deep red light to the phosphors emitting blue, green and red light, 620 to 670 can be obtained.
The reduction in the total luminous flux can be suppressed while enhancing the emission in the red region of nm to make the appearance of the red object more vivid.

The bulb shape of the fluorescent lamp of the present invention may be a bent bulb, a straight tube bulb or a plate bulb, and may be a lamp having a built-in lighting circuit device or a lamp not having a built-in lighting circuit device. Can also be applied.

A fluorescent lamp according to a second aspect of the present invention comprises:
The first phosphor is a europium-activated barium magnesium aluminate (BaMgAl ₁₆ O ₂₇ ; Eu) phosphor, a europium-manganese co-activated barium magnesium aluminate ((BaMg ₂ Al ₁₆ O ₂₇ ; Eu, M)
n) Phosphor, europium-activated barium calcium halophosphate strontium magnesium ((BaCa
SrMg) ₁₀ (PO ₄ ) ₆ Cl ₂ ; Eu) phosphor, europium activated strontium calcium barium halophosphate ((SrCaBa) ₅ (PO ₄ ) ₃ Cl; E
u) Phosphor or strontium pyrophosphate activated with tin (S
rP ₂ O ₇ ; Sn) at least one of phosphors,
The second phosphor is a cerium-terbium-activated lanthanum phosphate (LaPO ₄ ; Ce, Tb) phosphor or a cerium-terbium-activated magnesium aluminate ((CeT
b) At least one kind of MgAl ₁₁ O ₁₉ ) phosphor, the third phosphor is a europium-activated yttrium oxide (Y ₂ O ₃ ; Eu) phosphor, and the fourth phosphor is a manganese-activated phosphor. Floroger Mate (3.5Mg
_{O · 0.5MgF 2 · GeO 2;} Mn) characterized by comprising the phosphor.

By using the above-mentioned phosphor as a main component, the same effect as described in the first aspect can be obtained.

[0018] The fluorescent lamp according to claim 3 of the present invention comprises:
A glass bulb provided with electrodes, and a first bulb which emits blue light with an emission peak at 440 to 460 nm on the bulb surface.
A second phosphor having an emission peak at 535 to 570 nm and emitting green light, a third phosphor having an emission peak near 611 nm and emitting red light, and an emission peak at 650 to 670 nm and having a deep red color. Manganese activated magnesium fluormagnate emitting light (3.5MgO.
0.5MgF ₂ · GeO _2; 4 the fourth phosphor Mn)
A phosphor coating formed of a mixed phosphor mainly composed of various kinds of phosphors and adjusted so that the chromaticity is below the blackbody radiation locus (the deviation is on the negative side); And a sealed discharge medium.

The same operation as that of the first aspect is obtained.

A fluorescent lamp according to a fourth aspect of the present invention comprises:
The first phosphor is a europium-activated barium magnesium aluminate (BaMgAl ₁₆ O ₂₇ ; Eu) phosphor, a europium-manganese co-activated barium magnesium aluminate ((BaMg ₂ Al ₁₆ O ₂₇ ; Eu, M)
n) Phosphor, europium-activated barium calcium halophosphate strontium magnesium ((BaCa
SrMg) ₁₀ (PO ₄ ) ₆ Cl ₂ ; Eu) phosphor, europium activated strontium calcium barium halophosphate ((SrCaBa) ₅ (PO ₄ ) ₃ Cl; E
u) Phosphor or strontium pyrophosphate activated with tin (S
rP ₂ O ₇ ; Sn) at least one of phosphors,
The second phosphor is a cerium-terbium-activated lanthanum phosphate (LaPO ₄ ; Ce, Tb) phosphor or a cerium-terbium-activated magnesium aluminate ((CeT
b) At least one kind of MgAl ₁₁ O ₁₉ ) phosphor, wherein the third phosphor is a europium-activated yttrium oxide (Y ₂ O ₃ ; Eu) phosphor.

By using the above-mentioned phosphor as a main component, the same effect as described in the third aspect can be obtained.

A fluorescent lamp according to a fifth aspect of the present invention comprises:
The total amount of the first to third phosphors is 70% by weight or more of the total amount.

By controlling the mixed weight of the first to fourth phosphors, the same effect as described in the first to fourth aspects can be obtained.

If the mixing ratio of the fourth phosphor which emits deep red light, which is the main object of the present invention, is less than 5% by weight, the vividness of the appearance of a red object is reduced, and 30% by weight. Is exceeded, the total luminous flux is greatly reduced and the mixing ratio is 5 to 3
In the range of 0% by weight, preferably about 10 to 25% was good.

In experiments conducted by the present inventors, when the above-mentioned phosphors are mixed and used, if the total amount of the first to third phosphors is 70% by weight or more of the total amount, the appearance of a red object is observed. I was able to look more vivid.

[0026] The fluorescent lamp according to claim 6 of the present invention comprises:
The lighting fixture according to claim 7 of the present invention, wherein the bulb has a bent shape and is supported in a cover containing a lighting circuit device. A lighting device characterized in that the fluorescent lamp of (1) is mounted on a socket.

The radiated light from the luminaire using the fluorescent lamp having the functions described in the first to sixth aspects is:
Although the total luminous flux is slightly reduced, it has the effect of enhancing light emission in the red region to make the appearance of red objects more vivid.

The lighting apparatus can be used not only for general lighting, but also for lighting of commodities and for ornamental plants in fresh food stores such as meat, fish, fruits and the like.

[0029]

Embodiments of the present invention will be described below. FIG. 1 is an enlarged sectional view of a main part of the bulb-type fluorescent lamp L and a partially cutaway front sectional view, and FIG.
FIG. In FIG. 1, reference numeral 1 denotes a single continuous discharge path 12 in which three glass tubes 11, 11, and 11 bent in a U-shape are arranged in a triangular shape, connected at adjacent portions, and both ends are sealed. It is a formed valve. Reference numerals 2 and 2 denote coil-shaped electrodes constituting an electrode formed by winding a tungsten wire connected to a stem sealed at the end of the bulb 1 or a lead wire (not shown) implanted in the sealed portion. It is a filament. Reference numeral 3 denotes a protective coating made of aluminum (aluminum oxide) or the like formed on the inner surface of the valve 1.
Is a phosphor film described later formed on the protective film 3.

Reference numeral 5 denotes a holder for supporting the end of the bulb 1 and fixing a wiring board 61. The wiring board 61 includes circuit components 6 such as a ballast, a capacitor and a resistor.
There is provided a lighting circuit device 6 to which the electrodes 2, 2 are connected. The output of the lighting circuit device 6 supplies predetermined power to the electrodes 2, 2. Reference numeral 7 denotes a glove, and a portion facing the bulb 1 on the lower side in the figure has a transparent or light-transmitting portion 71 provided with light diffusing means, and an upper side accommodates the lighting circuit device 6 therein and has a light shielding means. Cover part 72 taken
It has become.

The holder 5 and the cover 72
Are fixedly supported by a base 8 to constitute a bulb-type fluorescent lamp L. A rare gas such as argon and mercury are sealed in the bulb 1 as a discharge medium. In the drawing, reference numeral 75 denotes a light-shielding plate that covers the mounting portion of the bulb 1 and the lighting circuit device 6.

In this lamp L, the phosphor material constituting the phosphor coating 4 formed on the inner surface of the bulb 1 is a europium-activated strontium halophosphate having a peak wavelength near 453 nm and emitting blue light as a first phosphor.・
Calcium barium ((SrCaBa) ₅ (PO ₄ )
₃ Cl; Eu) 3.2% by weight of a phosphor, and cerium / terbium-activated lanthanum phosphate (LaP) which emits green light with a peak wavelength near 544 nm as a second phosphor.
Europium-activated yttrium oxide (Y ₂ O _3), which emits red light with a peak wavelength near 611 nm as a third phosphor, containing 25.4% by weight of an O ₄ : Ce, Tb) phosphor.
Eu) a manganese-activated magnesium fluorogermanate having a peak wavelength of around 658 nm and emitting deep red light with the phosphor being 61.4% by weight and a fourth phosphor.
_{5MgO · 0.5MgF 2 · GeO 2;} Mn) and phosphor and component 4 or 10 wt%.

Then, these four kinds of phosphor powders are mixed together with a binder solution to prepare a phosphor suspension, and this solution is made to have a tube diameter of about 10 mm and a total length of about 250 m as usual.
m, coated and dried on the inner surface of the bent glass tube bulb 1 to form a phosphor coating 4, and then the stems are sealed at both ends. Then, the interior of the bulb 1 is evacuated to fill a rare gas and mercury. The lamp is manufactured.

The fluorescent lamp L has a spectral energy distribution as shown in FIG. In FIG. 3, the horizontal axis represents the emission wavelength (nm), and the vertical axis represents the ratio (relative) energy (%). As shown in FIG.
Manganese-activated magnesium Fluorochemicals germanate Nate in the vicinity 8nm (3.5MgO · 0.5MgF ₂ · Ge
The emission energy ratio of deep red emission color is increased by increasing the number of O ₂ ; Mn) phosphors.

The fluorescent lamp L according to the present invention
Table 1 shows the light emission characteristics of the conventional fluorescent lamp R and that of the current fluorescent lamp R. (Note that the phosphor film of the current fluorescent lamp R is a europium-activated strontium calcium barium halophosphate ((SrCaBa)) as a phosphor that emits blue light.
₅ (PO ₄ ) ₃ Cl; Eu) 4% by weight of phosphor, 28% by weight of cerium / terbium-activated lanthanum phosphate (LaPO ₄ : Ce, Tb) phosphor as a phosphor emitting green, emitting red light 67.5% by weight of a europium-activated yttrium oxide (Y ₂ O ₃ : Eu) phosphor as a phosphor that emits light, and a manganese-activated magnesium fluorogermanate (3.5MgO.0.5M) as a phosphor that emits deep red light
gF ₂ .GeO ₂ ; Mn) The phosphor contains 0.5% by weight of four kinds of components and has the same specifications as the lamp of the present invention except for the phosphor coating. )

[Table 1] As is clear from Table 1, the same color temperature was set (28).
00K), the lamp L of the present invention has a reduction in the total luminous flux, but has an average color rendering index Ra and special color rendering indexes R9 to R9.
15 is equivalent or lower in some cases, but shows excellent results in most evaluations.

According to the experiments conducted by the present inventors, the emission peak wavelength was around 658 nm (650 to 670 nm).
The energy intensity of m) is related to the energy intensity at which the emission peak wavelength for emitting green light is 535 to 570 nm, and the emission intensity for emitting deep red light with respect to the output energy intensity (as 100%) at the peak wavelength of 535 to 570 nm. When the output energy intensity at a peak wavelength of 650 to 670 nm is 10
By setting the content within the range of ２５25%, preferably 15-20%, the fluorescent lamp L with a good visibility of the red region was obtained.

The chromaticity of the fluorescent lamp L is (x = 0.344, y = 0.341) in the x, y chromaticity diagram, and the deviation from the blackbody locus at the correlated color temperature of 5000 K (Kelvin). Is 0.005 units in the minus (-) direction (-0.00
5uv). The average color rendering index Ra is 86,
The special color rendering index R9 is 20, and the total luminous flux (lighting 0 hour) is 3
It was 100 Lm.

It should be noted that the characteristic evaluation of the lamp cannot be evaluated simply by using only the above-mentioned average color rendering index Ra or the special color rendering indexes R9 to R15, and the visual appearance at the time of actual lighting is important. In the example, red was clearly seen in the visual evaluation.

Further, the lamp coated with the above-mentioned mixed phosphor has no blackening at the beginning of lighting, and has the same luminous flux maintaining characteristics as the conventional product during lighting, and is therefore suitable for mass production.

In the present invention, the first phosphor emitting blue light is a europium-activated barium magnesium aluminate (BaMgAl ₁₆ O ₂₇ ; Eu) phosphor (B
In addition to 1), europium and manganese co-activated barium magnesium aluminate (BaMg ₂ Al ₁₆ O ₂₇ ; Eu,
Mn) phosphor (B2), europium-activated halophosphate barium calcium strontium magnesium _{((BaCaSrMg) 1 0 (PO} 4) 6 Cl 2; E
u) Phosphor (B3), europium-activated strontium calcium barium halophosphate ((SrCaBa)
₅ (PO ₄ ) ₃ Cl; Eu) phosphor (B4) or tin-activated strontium pyrophosphate (SrP ₂ O ₇ ; Sn) phosphor (B5).

The second phosphor that emits green light is cerium / terbium-activated lanthanum phosphate (LaP).
O ₄ ; Ce, Tb) phosphor (G1) or cerium / terbium activated magnesium aluminate ((CeTb) M
gAl ₁₁ O ₁₉ ) phosphor (G1).

As the third phosphor that emits red light, europium-activated yttrium oxide (Y ₂ O ₃ ; E
u) A phosphor (R) can be used.

Further, as the fourth phosphor which emits deep red light, manganese-activated fluorogermanate (3.5 M) is used.
gO · 0.5MgF ₂ · GeO ₂ ; Mn) phosphor (R
1) can be used.

These phosphors may be used alone or as a mixture with the above-mentioned phosphors, or other phosphors containing these phosphors as a main component may be added. In addition, the effect of making the red substance more vivid with the addition of the fourth phosphor that emits deep red light was obtained.

Tables 2 and 3 show the results (Examples of the present invention and conventional examples) of the first to fourth phosphor materials, which were tested by changing the combination and the mixing amount.
Shown in

[0046]

[Table 2]

[Table 3] Considering the results of Tables 2 and 3, the first
Or the total amount of the third phosphor is 70% by weight of all the phosphors
It was found that it was sufficient to mix as described above to form a coating on the inner surface of the glass bulb.

When the mixing ratio of the fourth phosphor which emits deep red light, which is the main object of the present invention, is less than 5% by weight, the vividness of the appearance of a red object is reduced, and 30% by weight. Is exceeded, the total luminous flux is greatly reduced and the mixing ratio is 5 to 3
In the range of 0% by weight, preferably about 10 to 25% was good.

The fluorescent lamp is used by being mounted on a normal lighting fixture (not shown). This lighting device has an effect that, for example, a lamp is turned on in a hall of a hotel where a red curtain or a carpet is arranged, so that the red color of the curtain or the carpet is reflected and looks more beautiful.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, a bulb-shaped fluorescent lamp incorporating a lighting circuit device using a bulb with a bent glass tube has been described. However, the present invention is not limited to this. A fluorescent lamp having a shaped bulb, a straight tube bulb, or a plate-shaped bulb may be used, and of course, the present invention can be applied to a lamp having no built-in lighting circuit device.

The fluorescent lamp has an average color rendering index Ra and special color rendering indexes R9 to R even when the total luminous flux is slightly reduced.
As a result of the improved 15, it can be used not only for general lighting, but also for lighting of products and plants at a grocery store such as meat, fish, fruits, etc. Can be increased.

[0051]

According to the first to fifth aspects of the present invention, although the total luminous flux is slightly reduced, the blackening is small and the luminous flux maintenance characteristics during lighting are the same as those of the conventional product. Ra and the special color rendering index R9 to R15 can be improved, and there is an advantage that a fluorescent lamp can be provided which has an effect of making the appearance of a red object clearer even in the evaluation based on the visual sensation at the time of actual lighting.

According to the sixth aspect of the present invention, the same effect as described in the first to fifth aspects can be obtained by applying the present invention to a compact fluorescent lamp in which a lamp and a lighting circuit device are integrated. .

Further, according to the invention of claim 7,
7. A lighting device using a fluorescent lamp having the effects described in the above claims 1 to 6, which makes it possible to make objects in the red region more vivid, and is used not only for general lighting but also for fresh food such as meat, fish, fruits and the like. There is an advantage that it is possible to provide a lighting device suitable for lighting a product in a store or the like or for ornamental plants.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing an embodiment of a fluorescent lamp (bulb-shaped fluorescent lamp) according to the present invention, in which a main part cross section is enlarged and a part is cut away.

FIG. 2 is a bottom view of the fluorescent lamp of FIG. 1;

FIG. 3 is a spectral energy distribution diagram of the fluorescent lamp of the present invention,
The horizontal axis shows the emission wavelength (nm), and the vertical axis shows the ratio (relative) energy (%).

[Explanation of symbols]

 L: fluorescent lamp 1: glass bulb 4: phosphor coating 6: lighting circuit device 7: globe

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuhisa Ogishi 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo F-term in Toshiba Lighting & Technology Corporation (reference) 5C043 CC09 DD28 EB02 EC14 EC16 EC17 EC18

Claims (7)

[Claims] 1. A glass bulb provided with electrodes; an emission peak formed on the bulb surface is 440 to 460 nm.
The first phosphor that emits blue light and has an emission peak of 53
A second phosphor that emits green light at 5 to 570 nm, a third phosphor that emits red light with an emission peak near 611 nm, and a second phosphor that emits deep red light with an emission peak at 650 to 670 nm and the second phosphor A phosphor coating made of a mixed phosphor mainly composed of four kinds of phosphors of a fourth phosphor having an output energy of 10 to 25% of the output energy of the phosphor; a discharge medium sealed in the bulb; A fluorescent lamp comprising: 2. The method according to claim 1, wherein the first phosphor is europium-activated barium magnesium aluminate (BaMgAl).
₁₆ O ₂₇ ; Eu) phosphor, europium, manganese co-activated barium magnesium aluminate (BaMg ₂ Al ₁₆
O ₂₇ ; Eu, Mn) phosphor, europium activated barium calcium strontium magnesium halophosphate ((BaCaSrMg) ₁₀ (PO ₄ ) ₆ Cl ₂ ; E
u) phosphor, europium-activated strontium calcium barium halophosphate ((SrCaBa) ₅ (PO
_{4) 3} Cl; Eu) phosphor or Suzuzukekatsu pyrophosphate strontium (SrP ₂ O _7; Sn) comprising at least one phosphor, also, the second phosphor is a cerium-terbium-activated lanthanum phosphate ( LaPO ₄ ; Ce, Tb) phosphor or cerium / terbium-activated magnesium aluminate ((CeTb) MgAl ₁₁ O ₁₉ ) phosphor, and the third phosphor is europium-activated yttrium oxide ( Y ₂ O _3; Eu) a fluorescent substance, further, the fourth phosphor manganese activated fluorosilicone germanate Nate _{(3.5MgO · 0.5MgF 2 · GeO 2} ;
2. The fluorescent lamp according to claim 1, comprising a Mn) phosphor. 3. A glass bulb provided with electrodes; a first phosphor which emits blue light with an emission peak at 440 to 460 nm on the surface of the bulb; and an emission peak of 535 to 570.
a second phosphor that emits green light at 370 nm, a third phosphor that emits red light with an emission peak near 611 nm, and manganese-activated magnesium fluorogermanate that emits deep red light with an emission peak at 650 to 670 nm (3.5MgO.0.5MgF ₂ .GeO ₂ ; Mn) The fourth phosphor is a mixed phosphor mainly composed of four kinds of phosphors, and the chromaticity is below the black body radiation locus (deviation). The phosphor lamp comprises: a phosphor coating formed so as to be adjusted to-side; and a discharge medium sealed in the bulb. 4. The method according to claim 1, wherein said first phosphor is europium-activated barium magnesium aluminate (BaMgAl).
₁₆ O ₂₇ ; Eu) phosphor, europium, manganese co-activated barium magnesium aluminate ((BaMg ₂ Al
₁₆ O ₂₇ ; Eu, Mn) phosphor, europium activated barium calcium strontium magnesium halophosphate ((BaCaSrMg) ₁₀ (PO ₄ ) ₆ Cl ₂ ;
Eu) phosphor, europium-activated strontium calcium barium halophosphate ((SrCaBa) ₅ (P
O ₄ ) ₃ Cl; Eu) or at least one of tin-activated strontium pyrophosphate (SrP ₂ O ₇ ; Sn) phosphor, and the second phosphor is cerium / terbium-activated lanthanum phosphate. (LaPO ₄ ; Ce, Tb) phosphor or cerium / terbium-activated magnesium aluminate ((CeTb) MgAl ₁₁ O ₁₉ ) phosphor, and the third phosphor is europium-activated yttrium oxide. (Y ₂ O _3; Eu) fluorescent lamp according to claim 3, characterized in that it consists of a phosphor. 5. The method according to claim 1, wherein the total amount of the first to third phosphors is 70% by weight or more of the total amount.
5. The fluorescent lamp according to any one of items 1 to 4. 6. The fluorescent lamp according to claim 1, wherein the bulb has a bent shape and is supported in a cover containing a lighting circuit device. 7. A lighting device comprising the fluorescent lamp according to claim 1 mounted on a socket.