JPS5945384A - Preparation of yttrium oxide fluorescent substance activated with europium - Google Patents
Preparation of yttrium oxide fluorescent substance activated with europiumInfo
- Publication number
- JPS5945384A JPS5945384A JP15517982A JP15517982A JPS5945384A JP S5945384 A JPS5945384 A JP S5945384A JP 15517982 A JP15517982 A JP 15517982A JP 15517982 A JP15517982 A JP 15517982A JP S5945384 A JPS5945384 A JP S5945384A
- Authority
- JP
- Japan
- Prior art keywords
- europium
- yttrium oxide
- oxide
- yttrium
- fluorescent substance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【発明の詳細な説明】
(発明の技術分野)
本発明はユーロピウム、イづ活酸化イツトリウムけい光
体の製造法の改良に四−1も。DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention is directed to improvements in the production method of europium and activated yttrium oxide phosphors.
(発明の技術的背景及び七の問題点)
ユーロピウムで付活された赤色発光希土類酸fヒ物螢光
体としてY2O3: Eu %に光(< 、 (壜1
120. : ■y u q6y )Yi体+ L
a! Os ” ” ’12−)’I:I L本、
(Y 、G(1%03 : 、E u イl:
) )t f本。(Technical Background of the Invention and Seven Problems) Y2O3: Eu% as a red-emitting rare earth acid f arsenic phosphor activated with europium (<, (Bottle 1
120. : ■yu q6y) Yi body + L
a! Os ” ” '12-)' I: I L book,
(Y,G(1%03:,EuIl:
) ) t f book.
(Y 、 L a )t 03 : Jb u螢光体等
が知られている。(Y, L a ) t 03 : Jb u phosphor and the like are known.
この中でユーロピウム付活酸化イツトリウム螢光体Y、
0. : Huは主成分であるイツトリウム化合物で
あることと、電F fi泉粋よび紫外線動、INによる
輝度2発光色等の螢光体特性が優れていることからカラ
ーテレビジョン用ブラウン管の赤色発光成分螢光体とし
て、さらに照明用の演色性を改善17たデラックス型の
螢光ランプの赤色発光成分螢光体として賞月さルている
。Among these, europium-activated yttrium oxide phosphor Y,
0. : Hu is a red light-emitting component of cathode ray tubes for color televisions because it is a yttrium compound as a main component and has excellent phosphor properties such as electric flux, ultraviolet rays, and two luminous colors due to IN. It is also being used as a phosphor for red light emitting components in deluxe type fluorescent lamps with improved color rendering properties for illumination.
ユーロピウム付活酸化イツトリウム螢光体は酸化イツト
リウム(Y2O3) ’または炭へで塩、硝酸tH,x
等の高温で容易に酸化イツトリウムに変わるイツトリウ
ム化合物と、酸化ユーロピウムh (Ell、 03)
、または炭酸塩、硝酸塩等の高温で容易に酸化ユーロピ
ウムに変わるユーロピウム化合物をボールミル等の物理
的な方法ご混合しで、この原料混合物金窄気中で焼成す
ることによって得られもが、1υ泳中における付活剤で
あるユーロピウムを均質に分散さすて、発光効率を向」
二さIJ−るたへ′)しζ(−11,ら各Jili原材
料を化学的にit?、合する方法t・ζよ)でも得られ
る。Europium-activated yttrium oxide phosphor is produced by yttrium oxide (Y2O3)' or charcoal salt, nitric acid tH,x
Yttrium compounds that easily convert to yttrium oxide at high temperatures, such as yttrium oxide, and europium oxide h (Ell, 03)
Alternatively, carbonates, nitrates, and other europium compounds that easily convert into europium oxide at high temperatures can be mixed using a physical method such as a ball mill, and this raw material mixture can be fired in a closed atmosphere. Europium, an activator, is homogeneously dispersed to improve luminous efficiency.
It can also be obtained by combining the Jili raw materials chemically (t・ζ).
すなわち、酸化・イツトリウムと酸化ユーロピウムを所
定:4、塩酸または硝酸に溶解しで、この溶液に′fA
酸または蓚酸ジメチル水溶液を加えて、イットリウ11
と二〜ロビウトの共沈蓚酸+1沈澱を生成して、次いで
この共沈蓚酸tiN rt、澱4二r過乾燥後望気中で
800〜1100°Cの温度CノIII熱分解してYl
?+合希二に類酸化物とし、さらにこの原料混α′吻を
′)1v気中で1200〜1500”Cの温度で焼成t
ろことによって混合m土類酸化物と同じ組成の螢光体が
得ら1する。That is, yttrium oxide and europium oxide are dissolved in hydrochloric acid or nitric acid, and 'fA is added to this solution.
Yttrium 11 by adding acid or dimethyl oxalate aqueous solution
Co-precipitated oxalic acid + 1 precipitate of 2~Robiut was produced, and then this coprecipitated oxalic acid tiNrt, 42r sludge was overdried, and then thermally decomposed at a temperature of 800~1100°C in air to yield Yl.
? + synthesized into a secondary oxide, and further calcined this raw material mixture α') at a temperature of 1200 to 1500"C in 1 V air.
By filtering, a phosphor having the same composition as the mixed m-earth oxide is obtained.
この希七類酸化物螢光体の組成+!」: (Y+−8,
Eux)to、(ただし10 ’、<x<2X 10−
’)が好ましく、Xの値が2X10−” を越えた用
倉あるいは101未満の鳴禽は得られた螢光体の輝度&
、t−1′4L <低トしてθftしくない。Composition of this rare hepta-oxide phosphor +! ”: (Y+-8,
Eux) to, (10', <x<2X 10-
) is preferable, and if the value of X exceeds 2
, t-1'4L < θft is not good.
近年、ブラウン管や照明用な)′r7ランプの輝度向上
は業界における大きな課題であシ、−仁のために螢光体
の輝度向上が望まitている。In recent years, improving the brightness of `R7 lamps (for cathode ray tubes and lighting) has been a major issue in the industry, and it is desired to improve the brightness of phosphors for general use.
(発明の目的)
本発明は以上のような要求を満足する輝1.1[I時性
を向上したユーロピウム付活酸化イツトリウム螢光体を
得るための改良さJ’した製造方法を提供することを目
的とする。(Objective of the Invention) The present invention provides an improved manufacturing method for obtaining a europium-activated yttrium oxide phosphor with improved luminescence properties that satisfies the above requirements. With the goal.
(発明の概要)
本発明者等はユーロピウム付活酸化イツトリウム螢光体
の′区子線および紫外線励起下で4F、)’(i効率が
高い螢光体を開発する目的とし−C,種々の融剤を用す
る研究を重ねた結果、融剤とし゛Cホウ酸バリウムを加
えて焼成することにより、目的が達成されることを発見
し、この発明を完成した。(Summary of the Invention) The present inventors have developed a europium-activated yttrium oxide phosphor for the purpose of developing a phosphor with high efficiency under 4F and ultraviolet radiation excitation. As a result of repeated research on using a flux, it was discovered that the objective could be achieved by adding barium C borate as a flux and firing, and this invention was completed.
すなわち、本発明は原料混合物を焼成してユーロピウム
付活酸化イツトリウム螢光体を製造する方法において、
原N混合物はホウ酸バリウムを3有するものであること
を特徴とするユーロピウム付活酸化イツトリウム螢光体
の製造方法である。That is, the present invention provides a method for producing a europium-activated yttrium oxide phosphor by firing a raw material mixture.
This is a method for producing a europium-activated yttrium oxide phosphor, characterized in that the raw N mixture contains 3 barium borate.
本発明により得られるユーロピウム付活酸化イツ) I
Jウム螢光体は電子線励起下で0.5〜3係累外純励起
下で1〜8%の発光効率が向−にするはかりか、付活剤
である酸化:し−ロビウノ□ (E u、0.)の濃度
をトげた場合でも非常に発)Yつ効率の冴れた効果を有
する。なお原料混合物に含有ジ、ろホウ酸バリウノ、の
−は酸化ホウ素(n、os)とじ7− HtI科晶仔物
の0.0010、s
〜1重斌係となる割合が好ましい。Europium activated oxide obtained by the present invention) I
The Jium phosphor has a luminous efficiency of 1-8% under electron beam excitation and 0.5-3% pure excitation. Even when the concentration of u, 0.) is exceeded, it has a very sharp effect with high efficiency. It is preferable that the proportion of di- and baloboric acid contained in the raw material mixture is 0.0010, s to 1 centigrade of boron oxide (n, os).
酸化ホウ素(o、Os)としてfl、fl 01 ij
I?Cチ未満のホウ酸バリウム凌では輝度向−ヒの効
果に認められV、酸化ホウ素(ntO*)としてtl、
5 fj、、 Tht’係を超えるホウ酸バリウム隈
だと発)11;効率がl!: F’ J−るばかりか、
非常に固く焼結しCし中9のr IIf :t 1.、
<なj・)、。fl, fl 01 ij as boron oxide (o, Os)
I? When barium borate is less than C, the effect of increasing brightness is observed.
5 fj,, It is said that barium borate exceeds Tht') 11; Efficiency is l! : Not only F' J-ru,
Very hard sintered C medium 9 r IIf:t 1. ,
<Naj・),.
(発明の実施例)
以丁実施V;IIVCもとI“いて本発明の詳細な説明
する。(Embodiments of the Invention) The present invention will be described in detail in this embodiment.
実施例1
酸化イツトリウム1.、 ”f、(i)、 ) 9.5
モルと酸化−1−−−1’+ピウム(f弓u、0.)
11.5モルを枕HしC硝酸溶液2()p中に投入し十
分攪拌して完全に溶hγする。次に蓚酸13モルを投入
t、 −c 、イツトリウムとニー11ビウムの共沈蓚
酸塩を生成−ノる。この共rL#:酸1藷全1藷にて十
分に洗滌、さらに濾過乾燥後、空気中で900°Cの温
度で加熱分解してイツトリウムとユーロピウムの晶袷希
土類酸化物金得る。この【1も合希土類酸化物のイツト
リウムとユーロピウムの室液分析を行なった結果、(Y
oo5 、 (’+ IIn、o5)t(1*の組成で
あることを確認した。Example 1 Yttrium oxide 1. , “f, (i), ) 9.5
Mol and oxide -1--1'+pium (f bow u, 0.)
11.5 mol of the mixture was added to the nitric acid solution 2()p and thoroughly stirred to completely dissolve it. Next, 13 moles of oxalic acid was added to form a coprecipitated oxalate of yttrium and n-11bium. This rL#: Thoroughly washed with one part of acid and one part of acid, further filtered and dried, and then thermally decomposed in air at a temperature of 900°C to obtain rare earth oxide gold containing crystals of yttrium and europium. This [1] was also analyzed in the chamber fluid for yttrium and europium, which are rare earth oxides.
It was confirmed that the composition was oo5, ('+ IIn, o5)t(1*).
次にこのイツトリウムとユーロピウJ・の混合希土類酸
化物を各200グラム秤礒したものを] 0飼準備し、
こhに酸化ホウ素(B、0、)として0.0005゜0
.001 、 tl、005 、0.01. 、0.0
3 、0.05 、 (1,1、0,5、1,,0、i
、、511j1係となる驕の四ホウ酸バリウム(Ha
11. (、)7 )を秤破して投入17て、それぞれ
を十分にボールミルにて混合する。この混合物をふた付
き石英るつぼJO飼にそれぞれ投入して空気中で130
0°0の温度で5時間焼成する。Next, 200 grams each of the mixed rare earth oxides of yttrium and europium J. were weighed and prepared.
0.0005゜0 as boron oxide (B, 0,)
.. 001, tl, 005, 0.01. , 0.0
3, 0.05, (1,1,0,5,1,,0,i
,, Barium tetraborate (Ha), which is part of 511j1
11. (,)7) are weighed and added (17), and thoroughly mixed in a ball mill. This mixture was put into a quartz crucible with a lid and placed in the air for 130 min.
Bake for 5 hours at a temperature of 0°0.
一方、比較品として、四ホウ酸バリウムが入りていない
前記イツトリウムとユーロピウムのrt4 全希土類酸
化物200グラムをふた付き石英ルツボに投入して、前
記同様空気中で1300°0の温度で5時間焼成する。On the other hand, as a comparative product, 200 grams of the rt4 total rare earth oxides of yttrium and europium containing no barium tetraborate were placed in a quartz crucible with a lid, and fired in air at a temperature of 1300°0 for 5 hours as described above. do.
前記焼成物it個そa−eiを乳鉢で粉砕しU 100
メツンユe 曲+!月−7、温水Vr’−C十分洗滌後
、濾過乾燥しさらに10 Qメツ7/ユを西i1+6後
、紫外]1侘254旧11励起による([1ズ・1発)
Y1輝度、電子線陽fiiTh +#f、圧6KVIj
7り起に訃ける相対発)゛C7輝rs:(t gY価。The baked product (a-ei) was crushed in a mortar to yield U 100
Metsunyu e song+! Moon-7, after thorough washing with hot water Vr'-C, filter drying and further 10
Y1 brightness, electron beam positive fiiTh +#f, pressure 6KVIj
Relative origin that dies on the 7th rise) ゛C7 bright rs: (t gY value.
比中空した。I felt empty.
この結果を第1表に示す。The results are shown in Table 1.
第1喪
第1表かられかるよって紫外線254n+n励起輝度は
比較品に対してH,03とし−Cの一@礒係り、000
5係添加では効果がないが、1月)01〜0.5%添’
Jllで1〜8チの輝度向上が昭められ、0.0 :(
%添加で7iψ高の8%の向上を示した。しかし、添加
液が10幅以−ヒでは比較品より輝度代丁すると同時に
非當に固く焼結してしまった。According to Table 1, the excitation brightness of ultraviolet rays 254n+n is H,03 for the comparative product, and -C is 1 @ 000.
Adding 5% has no effect, but adding 01 to 0.5% (January)
The brightness improvement of 1 to 8 inches was announced in Jll, 0.0 :(
% addition showed an 8% improvement in 7iψ height. However, when the additive liquid exceeded 10%, the brightness was lower than that of the comparative product, and at the same time, the product was sintered extremely hard.
一方、′心子線61(V励起輝度は比較品に対しCB、
03としての重−1*i 61j+)、001%未満の
添加テld 効果力ないが、0.05〜0.5係添加で
0.5〜3係の輝度向」二が認められ、1)o3係添加
で最高の3係の向にを示した。しか1〜添加峻が1.0
4以上では紫外線254n+n励起輝度と同様に輝度低
下した。On the other hand, 'core wire 61 (V excitation brightness is CB compared to the comparative product,
03 as weight -1*i 61j+), addition of less than 001% is not effective, but addition of 0.05 to 0.5% brightness direction of 0.5 to 3% is recognized, 1) When o3 coefficient was added, the highest value was shown towards the third coefficient. Only 1~Additionally 1.0
4 or higher, the brightness decreased in the same way as the ultraviolet 254n+n excitation brightness.
実施例2
付活剤である酸化ユーロピウム(B u 203 )の
濃度を変化させたJA会木本発明螢光体の効果を確認す
るため、前□[2実施例jと同様の方法で(’Iu 9
r、 、I幀f1.05)デOs + (YO,96+
”uo、04 )凸+ (Yo、963 + ”’0
.035 )ToHの組成を有する3種■Iの+14
it希土類酸化物f:得た。Example 2 In order to confirm the effect of the phosphor of the present invention in which the concentration of europium oxide (B u 203 ), which is an activator, was varied, (' Iu 9
r, ,I幀f1.05)deOs + (YO,96+
”uo, 04 ) convex + (Yo, 963 + ”'0
.. 035) 3 types with the composition of ToH■ I +14
It rare earth oxide f: Obtained.
次にこのイツトリウムとユーロピウムの混合希七類酸化
!吻をそれぞ1L5(用ダラム秤縫したものに酸化ホウ
素(B、011)として0.03重i21チとなるht
の四ホウ酸バリウム(B;l 1140. ) を秤
冴し〔それぞ71.に投入し、ボールミルにて十分占師
後、ふた付き石英ルツボに投入する。Next is the mixed dilute heptad oxidation of yttrium and europium! The proboscis was sewn with 1L5 (Durham scale stitch), and as boron oxide (B, 011), it was 0.03 times i21 times.
Barium tetraborate (B; l 1140.) was weighed [71. After thorough testing in a ball mill, the mixture is poured into a quartz crucible with a lid.
一方比較品としC1四ホウ酸バリウノ、の人−)Cいな
い混作希土類酸化物3種類それぞれを5(lf)グラム
をふた付き石英るつぼに投入したものを準備して両者を
同時に空気中で13 (10℃の温度??5時間焼成す
る。さらに、この焼成物′f:!Lぞれを乳鉢で粉砕し
て100メツシユを通過(7、温水にご十分洗滌後、濾
過乾燥し’C100メツシユを11過さすも。On the other hand, as a comparison product, 5 (lf) grams of each of three kinds of mixed rare earth oxides (C1 tetraborate barium, human-C) were put into a quartz crucible with a lid, and both were simultaneously placed in the air for 13 ( Fire at a temperature of 10°C for 5 hours.Furthermore, each of the fired products'f:!L is crushed in a mortar and passed through a 100 mesh. It's already past 11.
L記で得られた本発明のユーロピウム、付活11セ化イ
ツトリウム螢)16体と比軸用螢光体に)bで、実施例
Jと同様に紫外線254 n m l1il)起による
相対発)1(S輝度と電子線陽極颯fE6KV励起に陵
ける相対発光輝度を評価、比較した結果訃よ0−1本発
明の二を一ロビウム付活酸化イツトリウム911. 光
体中のバリウム(Ba)、ホウ素(13)の定則4分析
を行1つだ結果’を第2表に示す。The europium of the present invention obtained in Example L, the activated yttrium 11cetate fluorescein (16) and the phosphor for specific axis (b) were subjected to relative emission by ultraviolet rays of 254 nm lil) in the same manner as in Example J). 1 (The results of evaluating and comparing the relative emission brightness between S brightness and electron beam anode fE6KV excitation are 0-1.) The second aspect of the present invention is mono-robium activated yttrium oxide 911. Barium (Ba) in the light body, The results of Rule 4 analysis of boron (13) in one row are shown in Table 2.
第2表かられかるように本艷明螢)’(: (+、はL
J清削びあるH9化ユ−ロビウノ、(E謁(+、 )
p 19−♀′(化した鳴会でも比−11Q品に対しC
,紫外線’) 54 nm励起輝度で+(、(1〜!1
.3 %の輝1r(向)−1+’lt I′ili:i
! 6f< V bilノ起4HIl ′c2.4〜:
4.0 %の118B HttH向1 k ffJ i
、= 。’I’!Yに紫外線254 nm li、II
rlj;輝度イー’l’> イテ&j睨「A’+ F
]’::、’価1 m 71−1−一【ゴビウム(E
+12”M )をイ1.(1!’1モルかr) il
、fl :(5〔ルと:10ギ・減H,7tさすた鳴r
c cも、酸f);、−・ ロビウl、旧)5モルの
比蚊品に灯L −11=E発明31障)1t fk t
、l: 7チの輝1rt二向1:う;1(畢らJL、発
)+(、効率t、′)1瞭fしたくフ1弔を11する−
1−− Iffffビラ1;1活f’+W 化イツ1.
す+)y /、Km )Y; f本C、is ルCとを
f4tた。fx 、I’;・不発明螢)41体中(、゛
)バリ1゛アノ、(11)、−1(つ素fnl 2定に
分析(7た結果fxハ、 f−’ :?t 2 D 1
1 p pm J、!;ノド+ 、1110 p p
m以ト含イr1.、fいろことをイ1ケ詔した。As shown in Table 2, this is
J clearing H9 version Eurobiuno, (E audience (+, )
p 19-♀' (C for the ratio-11Q product even in the changed Meikai
, ultraviolet ray') at 54 nm excitation brightness +(, (1~!1
.. 3% brightness 1r (direction) - 1+'lt I'ili:i
! 6f< V bil no 4HIl 'c2.4~:
4.0% 118B HttH 1 k ffJ i
, = . 'I'! Ultraviolet light 254 nm li for Y, II
rlj; Luminance E'l'> Ite & j glare "A'+ F
]'::,'Valency 1 m 71-1-1 [Gobium (E
+12”M) to i1.(1!'1 mole or r) il
, fl: (5〔LETO: 10G・Reduced H, 7t Sasuta Ning r
c c also acid f);, - Robiul, old) 5 mol of a light L -11=E invention 31 disorder) 1t fk t
, l: 7 Chi no Hikaru 1 rt Niko 1: U; 1 (Abira JL, departure) + (, efficiency t,') 1 clear f want 1 mourning 11 -
1-- Iffff flyer 1; 1 active f'+W conversion 1.
+)y /, Km)Y; f book C, is le C and f4t. fx, I';・uninvented fireflies) out of 41 bodies (,゛) Bali 1゛ano, (11), -1 (Tsu element fnl 2 constant analysis (7 results fxha, f-':?t 2 D1
1 ppm J,! ; Nodo + , 1110 p p
m or more including r1. , F Irokoto gave an edict.
Claims (2)
トリウム螢光体を輿、6’iする方法に朴いて、 ′
原料混合物はホウ酸バリウムを含有するものであること
を特徴とするユーロピウム、付活酸化イツトリウム螢光
体の製造方法。(1) Using a method of firing a raw material mixture to form a europium-activated yttrium oxide phosphor,
A method for producing a europium-activated yttrium oxide phosphor, characterized in that the raw material mixture contains barium borate.
j料i4 F+ 物<;、+ n、q n 11)、ダ 〜1重は俤となる割合の前記ホウ酸バリウl、を含有す
ることを特徴とする特a′F請求の範囲第1珀閉載のユ
ーロピウムは活酸化イツトリウム帯)16体のl111
!令方法。(2) Boron oxide (yO*) and li',
Claims 1 and 2 are characterized in that they contain the barium borate in a proportion of 1 to 1. Closed europium consists of 16 l111 (active yttrium oxide band)
! Law method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15517982A JPS5945384A (en) | 1982-09-08 | 1982-09-08 | Preparation of yttrium oxide fluorescent substance activated with europium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15517982A JPS5945384A (en) | 1982-09-08 | 1982-09-08 | Preparation of yttrium oxide fluorescent substance activated with europium |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5945384A true JPS5945384A (en) | 1984-03-14 |
JPH0132873B2 JPH0132873B2 (en) | 1989-07-10 |
Family
ID=15600212
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15517982A Granted JPS5945384A (en) | 1982-09-08 | 1982-09-08 | Preparation of yttrium oxide fluorescent substance activated with europium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5945384A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61193656A (en) * | 1985-02-22 | 1986-08-28 | 京セラ株式会社 | Composite implant and its production |
JPS6264884A (en) * | 1985-04-22 | 1987-03-23 | ゼネラル・エレクトリツク・カンパニイ | Fluorescent lamp using fluorescent mixture |
US5585692A (en) * | 1993-02-26 | 1996-12-17 | Kabushiki Kaisha Toshiba | Fluorescent material and fluorescent lamp using same |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55161883A (en) * | 1979-06-04 | 1980-12-16 | Mitsubishi Electric Corp | Production of phosphor |
-
1982
- 1982-09-08 JP JP15517982A patent/JPS5945384A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55161883A (en) * | 1979-06-04 | 1980-12-16 | Mitsubishi Electric Corp | Production of phosphor |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61193656A (en) * | 1985-02-22 | 1986-08-28 | 京セラ株式会社 | Composite implant and its production |
JPS6264884A (en) * | 1985-04-22 | 1987-03-23 | ゼネラル・エレクトリツク・カンパニイ | Fluorescent lamp using fluorescent mixture |
JPH0576982B2 (en) * | 1985-04-22 | 1993-10-25 | Gen Electric | |
US5585692A (en) * | 1993-02-26 | 1996-12-17 | Kabushiki Kaisha Toshiba | Fluorescent material and fluorescent lamp using same |
Also Published As
Publication number | Publication date |
---|---|
JPH0132873B2 (en) | 1989-07-10 |
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