JPS59226087A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To obtain a fluorecent lamp having high luminance, good appearance and suppressed blackening tendency at the tube ends and furnished with a fluorescent layer composed of a specific aluminate fluorescent material doped with Eu and a specific rare earth silicophosphate fluorescent material codoped with Ce and Tb, etc. CONSTITUTION:The objective fluorescent lamp is furnished with a fluorescent layer composed of (A) an aluminate fluorescent material of formula I (M is Zn, Mg, Ca, Sr, Ba, Li2, Rb2 or Cs2; anot equal to 0; bnot equal to 0) doped with Eu<2+> and/or an aluminate fluorescent material of formula II doped with Eu<2+> and/or an aluminate fluorescent material of formula II doped with Eu<2+> and Mn<2+>, (B) green light- emitting fluorescent material composed of a rare earth silicophosphate fluorescent material of formula III (LnI is Y, La, Gd, Lu or Sm; dnot equal to 0; enot equal to 0; fnot equal to 0) doped with Ce and Tb and/or a rare earth phosphate fluorescent material of formula IVdoped with Ce and Tb, and (C) a rare earth oxide fluorescent material of formula V (LnII is Y, La, Gd, Ge, Tb or Sm) doped with Eu.

Description

[Detailed description of the invention] [Technical field of invention] This invention relates to improvements in fluorescent lamps.

[Technical background of the invention and its problems]

One way to improve the color rendering properties without sacrificing the efficiency of fluorescent lamps is to increase the peak wavelength of the emission spectrum to 450 nIn, 540 nm, and 610 nm, respectively.
A so-called three-wavelength method using three types of phosphors whose emission spectrum has a relatively narrow half-width in the vicinity of nm has been proposed. Jin's three-wavelength method uses 2 as a blue-emitting phosphor whose emission spectrum has a peak wavelength near 450 nm+i.
For example, sium, calcium, and cerium phosphors have an emission peak wavelength of 540 nm.
Ce and Tb coactivated silicophosphate phosphors, such as Ce and Tb coactivated lanthanum silicate phosphors, or Ce and Tb coactivated phosphate phosphors such as Ce and The Tb-coactivated lanthanum phosphate phosphor has a peak wavelength of around 610 nm (the peak wavelength of the two emission spectra is around 610 nm).
IJum phosphor is used.

In addition, in recent years, there has been a trend to reduce the length of the lamp tube in order to reduce the price of fluorescent lamps and improve luminous efficiency. General C
：As the lamp tube diameter becomes smaller, the load on the lamp tube wall becomes larger (2. The end of the lamp tube becomes black while the lamp is on, which is a so-called blackening phenomenon. 9. Fluorescent lamps are brighter. The quality decreases.

The conventional three-wavelength fluorescent lamp using blue, green, and red light-emitting phosphors has the disadvantage that blackening begins to appear and the brightness decreases, especially when the lamp tube length becomes 26 mm or less. Ta.

[Purpose of the invention]

The present invention has been made in order to improve the above-mentioned drawbacks, and an object of the present invention is to provide a bright fluorescent lamp that does not cause blackening at the tube end.

[Summary of the invention]

In order to achieve the above objective, the inventors developed phosphors for each color of light (two), and through various experiments, discovered that they had developed a conventional blue-emitting phosphor, divalent Eu-activated halofluoride, as a blue-emitting phosphor. Instead of a phosphate phosphor (at least one type of aluminate phosphor activated with divalent Hu or Eu and manganese (Mn) is selected, and this blue-emitting phosphor is combined with the conventional green-emitting and red-emitting Combined with a phosphor, a 7'C3 wavelength fluorescent lamp (the 3rd dimension of the lamp is 26 mmφ)
It was discovered that the tube end blackening phenomenon does not occur even under the following conditions, and this invention was completed.

This blue-emitting phosphor has a general formula a(M,Eu)O-bAJlo, or a(M,Eu
, Mn) O-bk120゜(However, fvltIi
Zn, Mg, Ca, Sr, Ba, Li, , Rb, , Cs
, O at least one gutter, a jealous o, b4 o) 2
It is at least one kind of aluminate phosphor activated with nu or Mn of nu and Mn, and is disclosed in JP-A-56-1!12882.
It is known from Japanese Patent Laid-Open No. 56-152883 and 9% Publication No. 56-52072.

The general formula of the green-emitting phosphor is d(Lni, Ce, Tb)ρ
,.

es io, -fP, O, (However, Lni is Y, L
a, Gd, Lu, Sm at least t, d'', O,
Ce expressed as e 'Ki, O, f 'qO): J6
and Tb coactivated rare earth silicate phosphor, whose general formula is (Ln
It is at least one type of Ce and Tb co-activated rare earth phosphate fluorescent material represented by I, Ce, Tb)PO.

The general formula of red-emitting phosphor is (LnIr: , Eu)
20. (However, Ln[ is Ce, La, Gd, Y, T
b, Sm) of the nuu active rare earth oxide phosphor.

That is, in this invention, the general formula is a(M,Eu)0-bAl! 20. (however,
M is Zn.

-Mg, Ca, Sr, Ba, Li, , Rb, , Cs,
At least one type of CD, a divalent Eu-activated aluminate evening-emitting phosphor represented by a at least one type of Eu and Mn co-activated aluminate blue-green emitting phosphor having a general formula of a(LnI,
Ce.

Tb),'0. - e8102- fP, O, (However, Lni is Y, La, Gd.

At least one of Lu, Sm, d40. e+0. ,
Ce and Tb co-activated rare earth silicophosphate green emitting phosphor with the general formula (LnI,Ce,Tb
) P.O.

A green-emitting phosphor which is at least one kind of Ce and Tb co-activated rare earth phosphate green-emitting phosphor represented by
iy.

The fluorescent lamp is equipped with a fluorescent film comprising an ELI-activated rare earth oxide red-emitting phosphor represented by at least one of La, Gd, Ce, Tb, and Sm.

In the phosphor film, when the total amount of each color light-emitting phosphor is 100% by weight, the blue-emitting phosphor is 40% by weight, the green-emitting phosphor is 20-73% by weight, and the red-emitting phosphor is 5-65% by weight. It is preferable that the composition be composed of heavy ffi%.

The fluorescent lamp of the present invention improves tube end blackening of the three-wavelength fluorescent lamp.

Tube end blackening refers to a so-called blackening phenomenon in which the tube end of a fluorescent lamp becomes black during lighting, and this phenomenon occurs.

This significantly impairs the appearance of the lamp and significantly reduces its commercial value.

Blackening at the tube end varies depending on the type of phosphor, substances scattered from the electrodes, and impurity gas in the tube under the activated state of discharge, but the position where it occurs is always at a fixed position near the electrode.

To evaluate tube end blackening, it is sufficient to cut out a certain area including the glass and fluorescent film at the position where the blackening occurs, and measure the visible light transmittance of the glass and fluorescent film. As the degree of tube end blackening progresses, the visible light transmittance decreases.

The 40 watt type fluorescent lamp (tube diameter 25 mφ) of the present invention equipped with such a fluorescent film body was measured for visible light transmittance indicating the degree of blackening at the end of the tube. Activated haloborophosphate strontium, calcium, magnesium, cerium, phosphor (comparative example fluorescent lamp with two changes) was compared.

In this case, the visible light transmittance of the comparative example fluorescent lamp is ioo s
In contrast, the visible light transmittance of the fluorescent lamp of the present invention is 115 cm, and the degree of blackening is 15 cm of the comparative lamp.
It has been reduced by -. However, the measurement of tube end blackening was carried out for both the Example and Comparative Example lamps (=, 130 watts of the rated load of the 40 watt fluorescent lamp) in order to obtain the same blackening state with a relatively short period of lighting. 1500 under high load condition
I went after leaving the lights on for an hour. Vertical 15B from the tube end blackening occurrence area, that is, 45m from the 3011I+ site from the end of the lamp light emitting part.

A sample piece was cut out from a 15-inch section, and the visible light transmittance was measured using a Beckman transmittance meter C:.

Three-wavelength fluorescent lamps are put into practical use as high color rendering fluorescent lamps (for two-speed performance, the average color rendering index (A) is 80 or more and the lamp efficiency is 801!m/w or more). In order to satisfy this performance, the ratio of the blue-emitting phosphor, green-emitting phosphor, and red-emitting phosphor is 100% by weight, and the blue-emitting phosphor is o, i to 4.0% by weight.
, the composition should be comprised of 20-73% by weight of green-emitting phosphor and 5-65% by weight of red-emitting phosphor.

Furthermore, it is known that small amounts of alkali metals, boron oxide, gallium oxide, etc. are introduced into blue 2M color and red light-emitting phosphors, but even in such phosphors, the effects of the present invention are not affected in any way. Not affected by it.

[Embodiments of the invention]

Hereinafter, this invention will be explained in detail with reference to Examples.

Example (1) 3 (Ba, Mg, Eu) 0.8A as a blue-emitting phosphor
l! 2Q.

A divalent Eu-activated barium/magnesium aluminate phosphor shown in is used. After this phosphor (
5). The phosphor (A) exhibits narrow band emission with a peak wavelength at 452%m, and is suitable for a three-wavelength blue-emitting phosphor.

Comparative example lamp tray, Te3 (Sr, A(g, Eu, C
e) 0-Q,92P,O,-0,31CaC/, .0.
09B, 0. A divalent Eu-activated strontium-magnesium-cerium haloborophosphate blue-emitting phosphor represented by is used. This phosphor is hereinafter referred to as (B).

As a blue-emitting phosphor, a phosphor (Hewo 11 is used), a green-emitting phosphor (La, Ce, Tb) 20.-U, 2S
67% by weight of Ce and Tb co-activated lanthanum silicate phosphor denoted by iO, -0,9P2O, (Y, Ru) as a red-emitting phosphor, Eu-activated fluorocarbon IJ phosphor denoted by Using 22% by weight of the phosphor, a 40-watt, 5oooK white fluorescent lamp of this example with a tube diameter of 5 mm was prepared according to a conventional method, and the visible light transmittance was measured after lighting for 1500 hours.

In addition, a blue-emitting phosphor (two-phosphor type) was used as a comparative example fluorescent lamp, and a red-emitting phosphor was added to a Ce- and Tb-coactivated lanthanum silicate phosphate green-emitting phosphor, an Eu-activated fluorine oxide IJ, and a red-emitting phosphor. Similarly, a white fluorescent lamp of 40 watts and 5,000 watts with a diameter of 25 mm was used.

The emission spectrum distribution of this example fluorescent lamp at the initial stage of lighting is as shown in FIG. The visible light transmittance of this example fluorescent lamp was 115% compared to 100% of the comparative example fluorescent lamp, which is an improvement of 15 points.

In addition, the average color rendering index (fLa) at the initial stage of lighting is 84.
, the lamp efficiency shows a value of 90 /m/w.

The above results are summarized again in the table.

Examples 2 to 7 Fluorescent lamps were manufactured in the same manner as in Example 1 by changing the combination of phosphors within the scope of the present invention.

The comparative fluorescent lamp was 3 (S'IM) as a blue-emitting phosphor.
g, Eu, Ce) 0-0.92P, O, -0,31Ca
Cj and -0,09BtOs were used, but the other conditions were exactly the same as in each example. Visible light transmittance of each example,
Average color rendering index, lamp efficiency, etc. are shown in the table. For the visible light transmittance, the visible light transmittance of the comparative product was taken as 100%.

(Margin below)

[Brief explanation of the drawing]

FIG. 1 is an emission spectrum distribution diagram of the fluorescent lamp of the example at the initial stage of lighting. Representative Patent Attorney Kensuke Norichika (and 1 other person) Procedural amendment (voluntary) Commissioner of the Japan Patent Office 1, Indication of the case Patent Application No. 1982-100201 2, Name of the invention fluorescent lamp 3, Person making the amendment Case Relationship with Patent Applicant (307) Tokyo Shibaura Electric Co., Ltd. 4, Agent Address: 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo 100 Tokyo Shibaura Electric Co., Ltd. Tokyo Office Full text of the specification 6. Contents of amendments Corrections as per attached sheet Description 1, Title of the invention Fluorescent lamp 2, Claims (1) The general formula is a (M, Eu)ObAA! 1
01 (However, M is zinc (Zn) # magnesium (
Mg) e Calcium (Ca). Strontium <sr>#Barium (Ba),
Lithium (Lit), rubidium (i't'b t )
- Cesium (at least one type of C11, a~0.b~
0), a divalent europium (F!u) activated aluminate phosphor with the general formula a(M,Eu,Mn)Ob
A120g (However, M is at least one of zinc and manganese (Mn) activated aluminate phosphors, and the general formula is d(Ln,,ce,'rb), o, -esto
, -fp,o, (However, LnI is yttrium (Yl
, Lantern (La), Gadrimu, Mu11 (Xl+
4) $) L'u, Samari Ram (8m
), at least one of d~O, e~o + /←0
) Green-emitting La, Gd, which is at least one of the cerium and terbium coactivated rare earth phosphors represented by cerium and terbium coactivated rare earth phosphors;
1. A fluorescent lamp comprising a fluorescent film body comprising a europium-activated rare earth oxide phosphor represented by at least one of Ce, Tb, and am. 3. Detailed Description of the Invention [Technical Field of the Invention] This invention relates to improvements in fluorescent lamps. [Technical background of the invention and its problems] One method of improving the color rendering properties without making the efficiency of a fluorescent lamp a priority is to improve the emission spectrum by adjusting the peak wavelengths of the emission spectrum to around 450 nm, 540 nm, and 610 nm, respectively. A so-called three-wavelength method is known that uses three types of phosphors whose half-values are relatively narrow. In this three-wavelength method, the "peak wavelength" of the emission spectrum is 450 nm.
As a blue-emitting phosphor near m, a divalent Bu-activated octaboborophosphate phosphor, for example, a divalent Eu-activated haloborostrontium, magnesium, calcium, cerium phosphor, is used. Ce and Tb co-activated silicophosphate phosphor as a green-emitting phosphor with a wavelength around 540 nm;
For example, a Ce and Tb coactivated lanthanum silicate phosphor, or a Ce and Tb coactivated phosphate phosphor, such as a Ce and Tb coactivated lanthanum phosphate phosphor, further has an emission spectrum with a peak wavelength of around 610 nm. An Eu-activated fluorine oxide 9-luminescent phosphor is used as the red-emitting phosphor. In addition, in recent years, there has been a trend to reduce the diameter of the lamp tube in order to reduce the cost and improve the luminous efficiency of fluorescent lamps. Generally, as the diameter of the lamp tube decreases, the load on the tube wall of the lamp increases, so that the so-called blackening phenomenon, in which the end of the lamp tube becomes black during lamp operation, is more likely to occur. The brightness of a fluorescent lamp that exhibits a blackening phenomenon decreases. In the conventional three-wavelength fluorescent lamp using blue, green, and red light-emitting phosphors, a blackening phenomenon begins to appear when the special lamp tube diameter becomes 26 mm or less, resulting in a significant loss of commercial value. This had the disadvantage that not only did the brightness increase, but also the brightness decreased. [Object of the Invention] The present invention has been made in order to improve the above-mentioned drawbacks, and an object of the present invention is to provide a fluorescent lamp which is bright and has a high commercial value, in which the blackening of the tube end is significantly improved. [Summary of the Invention] In order to achieve the above object, the inventors conducted various experiments on phosphors of various emission colors, and found that a bivalent phosphor, which is a conventional blue-emitting phosphor, was used as a blue-emitting phosphor. Divalent Nu or Eu and manganese (
A three-wavelength type fluorescent lamp in which at least one type of aluminate phosphor activated with Mn) is selected, and this blue-emitting phosphor is combined with the conventional green-emitting and red-emitting phosphors. It was discovered that the phenomenon of tube end blackening can be significantly improved even when the tube diameter of the lamp is 26 mm or less due to a synergistic effect, and this invention was completed. All of the phosphors used in the present invention are known, and when used alone in a fluorescent lamp, a tube end blackening phenomenon occurs in the working cone. However, when specific phosphors are combined as in the present invention, With use, the darkening phenomenon is reduced to an extent that cannot be predicted. This is considered to be due to the synergistic effect of the combination of the various color phosphors shown in the present invention. ,・The blue-emitting phosphor used in the present invention has a general formula a(M, Eu
)0・bA120B or a(M, Eu, Mn)0*bA
J203 (M is Zn, Mg, Ca, 8r, Ba, L
It, Rb! At least one type of y"!, a←0.b~
At least one kind of divalent Bu or divalent Bu and Mn-activated aluminate phosphor represented by
Publication No. 6-152882. Japanese Patent Application Publication No. 56-152883, Japanese Patent Publication No. 56-520
It is known from Publication No. 72. The general formula of the green-emitting phosphor is d(Lnl, Ce, Tb)
20B・e8i01・/P10g (However, LnI is Y
, La, Gd, Lu, at least one of 8m, d~O,
Ce and Tb co-activated rare earth silicophosphate phosphor represented by O,/~0), whose general formula is (Lnl,Ce,Tb)
At least one Ce and Tb coactivated rare earth phosphate phosphor represented by PO4. The general formula of the red-emitting phosphor is (Lnl, Eu)tos (
However, Lnl is at least one type of Eu-activated rare earth oxide phosphor represented by at least one of Ce, La, Gd, Y, Tb, and Sm. That is, the present invention has a general formula of a(M, Eu)O.bA40g (where M is at least one of Zn, Mg, Ca, 8r, Ba, Li2.Rbl, Csl, a+0, b~0). Divalent Bu expressed
Activated aluminate blue-emitting phosphor, general formula is a(M, Eu, Mn)O・bAA! 10B
At least one type of divalent Bu and Mn coactivated aluminate blue-green emitting phosphor represented by
nl, Ce, Tb) 10B ・e8102-/P, OI
Ce and Tb co-activated rare earth-silicon phosphate green luminescence represented by l, (where Lnl is at least one of Y, ha, Gd, Lu, am, d~0.e~O,/toO) A green-emitting phosphor, which is at least one type of Ce and Tb co-activated rare earth phosphate green-emitting phosphor, whose general formula is (LnI,Ce,Tb)PO+;
n1, Ell)! O3 (However, Ln, is Y, La
, Gd, Ce. The present invention is a fluorescent lamp equipped with a fluorescent film body comprising a Fiu-activated rare earth oxide red-emitting phosphor represented by at least one of Tb and am. A particularly preferred combination is that the blue-emitting phosphor is a(M.Eu,Mn)O'' bA1203 and the green-emitting phosphor is a(Lnl, Ce, Tb)z08・eSI02・fP.
20. A combination of (Lnl, En)A with red light-emitting phosphors produces a bright fluorescent lamp with the least amount of blackening at the tube end. When the total amount of each color emitting phosphor is 100% by weight, the phosphor film contains 0.1-40% by weight of blue-emitting phosphor, 20-73% by weight of green-emitting phosphor, and 1% by weight of red-emitting phosphor. 5 to 6 phosphors
A composition comprising 5% by weight is preferred. The fluorescent lamp of the present invention improves tube end blackening of the three-wavelength fluorescent lamp. Tube end blackening is a so-called blackening phenomenon in which the end of the lamp tube becomes black while the fluorescent lamp is on.When this phenomenon occurs, the appearance of the lamp is significantly damaged, and the product value is significantly reduced. . Blackening at the tube end varies depending on the type of phosphor, substances scattered from the cathode, and impurity gas in the tube under the activated state of discharge, but the position where it occurs is always at a fixed position near the electrode. In order to evaluate this tube end blackening, it is sufficient to cut out a certain area including the glass and the fluorescent film at the position where the blackening occurs and measure the visible light transmittance of the glass and the fluorescent film. As the degree of tube end blackening progresses, the visible light transmittance decreases. The visible light transmittance, which indicates the degree of tube end blackening, was measured for the 40 watt type fluorescent lamp (tube diameter: 25 mm) of the present invention equipped with such a fluorescent film body, and the two of the blue-emitting phosphors were measured. A comparison was made with a comparative example fluorescent lamp in which the fluorescent material was changed to Eu-activated strontium/calcium/magnesium/cerium haloborophosphate. In this case, the visible light transmittance of the comparative example fluorescent lamp is 100%, while the visible light transmittance of the fluorescent lamp of the present invention is 115%, and the degree of blackening is 15% of that of the comparative example lamp.
It has been reduced by that amount. However, in order to measure the blackening at the end of the tube, in order to obtain the blackening state caused by long-time lighting with a relatively short lighting time, both the Example and Comparative Example lamps were used at a high temperature of 130% of the rated load of the 40 Watt fluorescent lamp. The test was carried out after being lit for 1500 hours under load. A sample piece was obtained by cutting off a section measuring 15 mm vertically and 15 mm horizontally from the area where blackening occurred at the tube end, that is, from the area 301 m from the end of the lamp light emitting part to 45 mm.
The visible light transmittance is a value measured using a Beckman transmittance meter. For a three-wavelength fluorescent lamp to be suitable for practical use as a high color rendering fluorescent lamp, it is generally assumed that the average color rendering index (Ra) is 80 or more and the lamp efficiency is 801rrv'w or more. In order to satisfy this performance, the ratio of the blue-emitting phosphor, green-emitting phosphor, and red-emitting phosphor is 100% by weight, and the blue-emitting phosphor is 0.1 to 40% by weight.
The composition should be comprised of 20-73% by weight of the green-emitting phosphor and 5-65% by weight of the red-emitting phosphor. Furthermore, it is known that small amounts of alkali metals, boron oxide, gallium oxide, etc. are introduced into blue, green, and red light-emitting phosphors, but even in such phosphors, the effects of the present invention are not affected in any way. Not affected. [Examples of the Invention] The present invention will be described in detail below with reference to Examples. Example (1) 3 (Ba, Mg, Eu) 0.8A as a blue-emitting phosphor
A divalent Eu-activated barium/magnesium aluminate phosphor weighing 120 g shall be used. This phosphor is hereinafter referred to as (A). The phosphor exhibits narrow band light emission with a peak wavelength at 452 mm, making it suitable for use as a three-wavelength blue-emitting phosphor. 3 (8r, Mg, Eu, Ce) 0 for comparative lamps
・0.92p, o, ・0.31 CaCJff, 6
A divalent Eu-activated strontium-magnesium-cerium borophosphate blue-emitting phosphor represented by o, o 9 B2O5 is used. This phosphor is hereinafter referred to as (B). 11% by weight of phosphor (4) as a blue-emitting phosphor and 101 m 0 as a green-emitting phosphor (La, Ce, Tb)
．． 67% by weight of a Ce and Tb co-activated lanthanum silicate phosphor represented by 28402 eo, 9PtO, as a red-emitting phosphor (E, represented by Y p Bu% 01).
Using 22% by weight of a activated yttrium oxide phosphor, the tube diameter in this example is 25 mm (40 mm) 500 mm according to the usual method.
A white fluorescent lamp was prepared at 0, and the visible light transmittance at 0 was measured after being lit for 1500 hours. In addition, as a comparative fluorescent lamp, a blue-emitting phosphor and a phosphor (
B), a 25M11d 40 watt tube using Ce and Tb co-activated lanthanum silicate green emitting phosphor and Eu activated indium oxide red emitting phosphor.
5000 using a white fluorescent lamp. The emission spectrum distribution of this example fluorescent lamp at the initial stage of lighting is as shown in FIG. The visible light transmittance of the fluorescent lamp of this example was 115% compared to 1.00% of the fluorescent lamp of the comparative example, which is a 15% improvement. Incidentally, when we manufactured fluorescent lamps of the same type using each phosphor alone and measured the zero visible light transmittance after 1500 hours of lighting, we found that phosphor (A) was 92%, phosphor (B> is 90%
(La, Ce, Tb) 203 ・0.25i02 ・0
．． 9 P2O6 is 104%, (Y, Eu) 20g
was 101%. If we predict the visible light transmittance of a three-wavelength fluorescent lamp from these values and the weight of the phosphor used, it will be around 102% at most, but for an actual lamp it will be 115%.
%, it is thought that this is due to the unique effect of the combination of the three phosphors. The average color rendering index (Ra) at the initial stage of lighting is 84.
, the lamp efficiency shows a value of 901rrv'w. Now, gather the testicles together again and skewer them outward. Examples 2 to 7 Fluorescent lamps were manufactured in the same manner as in Example 1 by changing the combination of phosphors within the scope of the present invention. A comparative fluorescent lamp uses 3(Sr. Mg, Bu, Ce)O” 0.92 P2()1 as a blue-emitting phosphor.
"0.31 CaC4" 0.09 B103 was used, but the other conditions were exactly the same as in each example. The visible light transmittance, average color rendering index, lamp efficiency, etc. of each example are listed. For the visible light transmittance, the visible light transmittance of the comparative product was taken as 100%. 4. Brief Description of the Drawings FIG. 1 is a diagram showing the emission spectrum distribution of the fluorescent lamp of the example at the initial stage of lighting. Agent Patent attorney Noriyuki Chika Procedural amendment (voluntary) ■, Indication of the case Patent application No. 58-100201 No. 2, Name of the invention Fluorescent lamp 8, Person making the amendment Relationship to the case Patent applicant (307) Tokyo Shibaura Kamek Co., Ltd. No. 0 Agent Address: 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo 100, Tokyo Shibaura Electric Co., Ltd. Tokyo Office 1) Between lines 15 and 16 of page 3 of the specification, there is a ``three-wavelength system''. Other examples of fluorescent lamps include blue-emitting phosphors (
Ba, Mg, Eu)O・bA120. A combination of MgO-B as a green-emitting phosphor, 03:Ce, Tb, and (Y.IFXu)t% as a red-emitting phosphor is also known. (Japanese Unexamined Patent Publication No. 128778/1983). ” is extracted. 2) Line 3 of the 12th Sada. ``... was 01%.'' followed by ``As another comparative example, the Hashiki luminescent material and the red luminescent phosphor were the same as in Example 1, and the green luminescent phosphor contained Mg.
O-B20. : When a fluorescent lamp using Ce and Tb was similarly evaluated, the visible light transmittance after being lit for 1500 hours was 99%. ” is inserted. More than 539-

Claims (1)

[Claims] (1) The general formula is a(M, Eu)0-bAl! 20.
(However, M is zinc (Zn), magnesium (Mg)
e Calcium (Ca) #Stayium (Sr), Valium A (Ba). A divalent europium (Eu)-activated aluminate phosphor represented by at least one of lithium ("t), rubidium (Rb), and cesium (CSz), a (0, b'40), whose general formula is a (M, Eu, Mn)0-bA/, 0. At least one kind of divalent europium and manganese (Mn) activated aluminate phosphor represented by d(LnI, Ce, 'rb) and ), o3-e
sio, -fP, 0. (However, LnI is yttrium (1), lanthanum (La), gadolinium (Gd), lutetium (Lu), samarium (Sm), at least one cD, d(0,e)O
. Cerium and terbium Tb) expressed as f-0)
A green-emitting phosphor that is at least one of cerium and terbium coactivated rare earth phosphate phosphors represented by PO, and a green-emitting phosphor having the general formula (LnlI, Nu)tOs (where Lnl is Y, La, Gd, Ce, Tb, Sm (D
What is claimed is: 1. A fluorescent lamp comprising a fluorescent film comprising a europium-activated earth oxide phosphor represented by at least one compound.