JPH0430432B2 - - Google Patents
Info
- Publication number
- JPH0430432B2 JPH0430432B2 JP12452184A JP12452184A JPH0430432B2 JP H0430432 B2 JPH0430432 B2 JP H0430432B2 JP 12452184 A JP12452184 A JP 12452184A JP 12452184 A JP12452184 A JP 12452184A JP H0430432 B2 JPH0430432 B2 JP H0430432B2
- Authority
- JP
- Japan
- Prior art keywords
- oxide
- rare earth
- europium
- mixed
- phosphor
- 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.)
- Expired
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 28
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims description 28
- 238000010304 firing Methods 0.000 claims description 14
- 229910052693 Europium Inorganic materials 0.000 claims description 10
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 229910001940 europium oxide Inorganic materials 0.000 claims description 6
- AEBZCFFCDTZXHP-UHFFFAOYSA-N europium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Eu+3].[Eu+3] AEBZCFFCDTZXHP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 229910052727 yttrium Inorganic materials 0.000 claims description 6
- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 claims description 5
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims description 5
- 238000010298 pulverizing process Methods 0.000 claims description 5
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 4
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 claims description 4
- 229910000154 gallium phosphate Inorganic materials 0.000 claims description 4
- LWFNJDOYCSNXDO-UHFFFAOYSA-K gallium;phosphate Chemical compound [Ga+3].[O-]P([O-])([O-])=O LWFNJDOYCSNXDO-UHFFFAOYSA-K 0.000 claims description 4
- 229910001938 gadolinium oxide Inorganic materials 0.000 claims description 3
- 229940075613 gadolinium oxide Drugs 0.000 claims description 3
- CMIHHWBVHJVIGI-UHFFFAOYSA-N gadolinium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[Gd+3].[Gd+3] CMIHHWBVHJVIGI-UHFFFAOYSA-N 0.000 claims description 3
- 150000002259 gallium compounds Chemical class 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 3
- -1 yttrium compound Chemical class 0.000 claims description 3
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims description 2
- 150000002178 europium compounds Chemical class 0.000 claims description 2
- 229910052733 gallium Inorganic materials 0.000 claims description 2
- 229910001195 gallium oxide Inorganic materials 0.000 claims description 2
- 150000002251 gadolinium compounds Chemical class 0.000 claims 1
- 239000002245 particle Substances 0.000 description 13
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 150000001340 alkali metals Chemical class 0.000 description 3
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 3
- 150000001342 alkaline earth metals Chemical class 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910005191 Ga 2 O 3 Inorganic materials 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000012190 activator Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001339 alkali metal compounds Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Luminescent Compositions (AREA)
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付活希土類酸化物蛍光体
の製造方法に係り、特に粒子結晶が良好、輝度が
高く、更に焼成・粉砕後の後処理を必要としない
赤色に発光するユーロピウム付活希土類酸化物蛍
光体の製造方法に関するものである。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method for producing a europium-activated rare earth oxide phosphor, which has particularly good particle crystallinity, high brightness, and further requires post-treatment after firing and pulverization. The present invention relates to a method for producing a europium-activated rare earth oxide phosphor that emits a red color.
ユーロピウム付活希土類酸化物蛍光体、その中
でも（Ｙ，Eu）2O3＝Y2O3：Eu蛍光体はガドリウ
ムに比較してイツトリウムが安価であるという理
由から三波長型蛍光ランプの赤色発光成分蛍光体
として現在広く実用されている。
Europium-activated rare earth oxide phosphors, among them (Y, Eu) 2 O 3 = Y 2 O 3 :Eu phosphors are used to emit red light in three-wavelength fluorescent lamps because yttrium is cheaper than gadolinium. It is currently widely used as a component phosphor.
このY2O3：Eu蛍光体の製造方法はEu2O3xモル
に対してY2O3が（１−ｘ）モルとなる割合で混
合し、混合希土類酸化物の組成が（Y1-x，Eux）
2O3で表わされる混合希土類酸化物を形成したの
ち、この混合希土類酸化物を焼成後粉砕して得ら
れる。 This Y 2 O 3 :Eu phosphor is produced by mixing Y 2 O 3 in a ratio of (1-x) moles to x moles of Eu 2 O 3 , and the composition of the mixed rare earth oxide is (Y 1 -x , Eu x )
It is obtained by forming a mixed rare earth oxide represented by 2 O 3 and then pulverizing this mixed rare earth oxide after firing.
この混合希土類酸化物はそれぞれの原料の所定
量をボールミル、ミキサーミル等によつて物理的
に混合する製造方法を使用してもよいが、母体中
における付活剤の分散を良くするために化学的に
混合する製造方法が一般に採用されている。 This mixed rare earth oxide may be manufactured by physically mixing predetermined amounts of each raw material using a ball mill, mixer mill, etc., but in order to improve the dispersion of the activator in the matrix, chemical Generally, a manufacturing method is adopted in which the components are mixed separately.
即ち、それぞれの原料を所定量ずつ塩酸または
硝酸により溶解し、この溶液に水溶液を加えて
Euとの共沈蓚酸塩沈澱を生成する。次に、この
共沈蓚酸塩沈澱を空気中で800℃乃至1100℃の温
度で加熱分解して（Y1-x，Eux）2O3で表わされる
混合希土類酸化物とする製造方法である。 That is, a predetermined amount of each raw material is dissolved in hydrochloric acid or nitric acid, and an aqueous solution is added to this solution.
Co-precipitation with Eu produces oxalate precipitate. Next, this coprecipitated oxalate precipitate is thermally decomposed in air at a temperature of 800°C to 1100°C to produce a mixed rare earth oxide represented by (Y 1-x , Eu x ) 2 O 3 . .
従来、この混合希土類酸化物を焼成する蛍光体
の製造方法には次の２つの方法がある。 Conventionally, there are the following two methods for producing phosphors by firing mixed rare earth oxides.
第１の製造方法は混合希土類酸化物を空気中で
1300℃乃至1500℃の温度で２時間乃至10時間焼成
後粉砕する方法である。 The first production method is to prepare mixed rare earth oxides in air.
This method involves firing at a temperature of 1300°C to 1500°C for 2 to 10 hours and then pulverizing.
しかしながら、このようにして得られた蛍光体
は蛍光体粒子が微細かつ不規則形状で蛍光体粒子
同志が凝集しているため、次のような問題点を有
している。 However, the phosphor thus obtained has the following problems because the phosphor particles are fine and irregularly shaped and the phosphor particles aggregate together.
第１に蛍光体粒子が不規則であり、粒子結晶が
良くない。 First, the phosphor particles are irregular and have poor particle crystallinity.
第２に蛍光体粒子同志が凝集しているため粒子
分布が不均一である。 Second, since the phosphor particles are aggregated together, the particle distribution is non-uniform.
第３に蛍光体粒子が微細なため輝度が低い。 Thirdly, the brightness is low because the phosphor particles are fine.
第２の製造方法は混合希土類酸化物の原料に微
量のLi2B4O7、NaF2などのアルカリ金属化合物
及びBa2B4O7などのアルカリ土類化合物を融剤と
して添加混合しこの混合希土類酸化物を空気中で
1100℃から1400℃の温度で２時間乃至10時間焼成
後粉砕する方法である。 The second production method involves adding and mixing small amounts of alkali metal compounds such as Li 2 B 4 O 7 and NaF 2 and alkaline earth compounds such as Ba 2 B 4 O 7 as fluxes to the mixed rare earth oxide raw materials. Mixed rare earth oxides in air
This method involves firing at a temperature of 1100°C to 1400°C for 2 to 10 hours and then pulverizing.
しかしながら、このようにして得られた蛍光体
は蛍光体粒子の結晶性は改善されるが次のような
問題点を有している。 However, the phosphor thus obtained has the following problems, although the crystallinity of the phosphor particles is improved.
第１に蛍光ランプに悪影響をおよぼすアルカリ
金属及びアルカリ土類金属が蛍光体中に混入して
いるため、焼成、粉砕後、このアルカリ金属及び
アルカリ土類金属を除去する後処理が必要であ
る。 First, since alkali metals and alkaline earth metals, which have an adverse effect on fluorescent lamps, are mixed into the phosphor, post-treatment is required to remove these alkali metals and alkaline earth metals after firing and crushing.
第２にアルカリ金属及びアルカリ土類金属が焼
成中に蛍光体焼成容器と反応し、容器の破損が著
しい。 Second, alkali metals and alkaline earth metals react with the phosphor firing container during firing, resulting in significant damage to the container.
本発明は上述した諸問題点に鑑みてなされたも
のであり、蛍光体の粒子結晶を改善し、後処理を
必要としないばかりでなく、紫外線励起により輝
度の高い赤色に発光するユーロピウム付活希土類
酸化物蛍光体の製造方法を提供することを目的と
している。
The present invention was made in view of the above-mentioned problems, and it is a europium-activated rare earth that not only improves the particle crystal of the phosphor and does not require post-treatment, but also emits a bright red color when excited by ultraviolet rays. The present invention aims to provide a method for manufacturing an oxide phosphor.
即ち、本発明は、酸化イツトリウムもしくはイ
ツトリウム化合物および酸化ガドリニウム化合物
のうち少くともいずれか１つと、酸化ユーロピウ
ムもしくはユーロピウム化合物とを酸化ユーロピ
ウムｘモルに対して酸化イツトリウムもしくは酸
化ガドリニウムのうちの少くとも１つが（１−
ｘ）モルとなるような割合で混合し、全酸化物に
換算した時の混合希土類酸化物の組成が（L1-x，
Eux）2O3で表わされる混合希土類酸化物を形成
し、この混合希土類酸化物１モルに対し、ガリウ
ムとして２×10-3モル乃至３×10-2モルの範囲と
なる割合の酸化ガリウム、燐酸ガリウムもしくは
ガリウム化合物のうちの少くとも１つを添加混合
し、空気中もしくは酸化性雰囲気中で1200℃乃至
1500℃の温度で焼成したのち、粉砕することを特
徴としている。但しＬはイツトリウム、ガドリニ
ウムのうちの少くとも１つ、ｘは10-3＜ｘ＜２×
10-1を満足する数である。
That is, in the present invention, at least one of yttrium oxide or a yttrium compound and a gadolinium oxide compound, and europium oxide or a europium compound are combined in a ratio of at least one of yttrium oxide or gadolinium oxide to x moles of europium oxide. (1-
x) The composition of the mixed rare earth oxide when converted to total oxide is (L 1-x ,
Eu x ) 2 O 3 forms a mixed rare earth oxide, and gallium oxide in a proportion ranging from 2 x 10 -3 mol to 3 x 10 -2 mol as gallium per 1 mol of this mixed rare earth oxide. , at least one of gallium phosphate or a gallium compound is added and mixed, and heated to 1200°C in air or an oxidizing atmosphere.
It is characterized by being fired at a temperature of 1500℃ and then crushed. However, L is at least one of yttrium and gadolinium, and x is 10 -3 <x<2×
This is a number that satisfies 10 -1 .
発明者らは先に述べた混合希土類酸化物を焼成
し蛍光体とするに際し、酸化ガリウム（Ga2O3）、
燐酸ガリウム（GaPO4）などのガリウム化合物
のうちの少くとも１つの所定量を添加混合し、酸
化性雰囲気（空気も含む）中で所定温度で焼成す
ることにより目的が達成されることを見出した。
The inventors used gallium oxide (Ga 2 O 3 ),
It has been discovered that the objective can be achieved by adding and mixing at least a predetermined amount of at least one gallium compound such as gallium phosphate (GaPO 4 ) and firing at a predetermined temperature in an oxidizing atmosphere (including air). .
実験の結果、Ga2O3、GaPO4の中のGaの添加
量（モル）と出来上つた蛍光体の相対輝度との関
係はそれぞれ第１図の曲線１，２となり、Gaの
添加量は２×10-3モル乃至３×10-2モルが良好で
あることがわかつた。 As a result of the experiment, the relationship between the amount of Ga added (in moles) in Ga 2 O 3 and GaPO 4 and the relative brightness of the finished phosphor is shown by curves 1 and 2 in Figure 1, respectively, and the amount of Ga added is It has been found that 2×10 −3 mol to 3×10 −2 mol is good.
これはGaが融剤として作用すると共に母体の
例えばY2O3に浸入してY3+に歪を与え、Eu3+の
Y3+へのドーピングを容易にさせるためと思われ
る。 This is because Ga acts as a flux and also penetrates into the matrix , e.g.
This seems to be to facilitate doping to Y 3+ .
しかし焼成温度と蛍光体の相対輝度との関係は
第２図の曲線３に示すようになり、1200℃以下で
は急激な輝度低下が起る。これはY3+へのGa3+の
ドーピングが起りEu3+の置換が行なわれないと
考えられる。 However, the relationship between the firing temperature and the relative brightness of the phosphor is as shown by curve 3 in FIG. 2, and a sharp drop in brightness occurs below 1200°C. This is considered to be because Ga 3+ is doped into Y 3+ and Eu 3+ is not substituted.
次に実施例により本発明を説明する。 Next, the present invention will be explained with reference to examples.
実施例 １
酸化イツトリウム（Y2O3）277.5ｇと酸化ユー
ロピウム（Eu2O3）22.5ｇとを濃硝酸（70％）
600c.c.を純水600c.c.に薄めた硝酸に溶解し、充分撹
拌する。次に、この溶液に蓚酸（C2O4H2・
2H2O）600ｇを添加し、充分にかく拌しながら
希土類似素と蓚酸塩を共沈させる。この沈澱物を
純水により充分洗浄し、脱水後200℃で乾燥した
のち、石英容器に入れて1000℃で２時間加熱分解
し、混合希土類酸化物を作る。Example 1 277.5 g of yttrium oxide (Y 2 O 3 ) and 22.5 g of europium oxide (Eu 2 O 3 ) were added to concentrated nitric acid (70%).
Dissolve 600 c.c. in nitric acid diluted with 600 c.c. of pure water and stir thoroughly. Next, add oxalic acid (C 2 O 4 H 2
Add 600 g of 2H 2 O) and co-precipitate the rare earth analog and oxalate while stirring thoroughly. This precipitate is thoroughly washed with pure water, dehydrated, dried at 200°C, placed in a quartz container, and heated and decomposed at 1000°C for 2 hours to produce a mixed rare earth oxide.
次にこの混合希土類酸化物１モルに対し、酸化
ガリウム（Ga2O3）を0.005モル添加し、ボール
ミルで充分混合した後、石英ルツボに詰めめて
1400℃で５時間電気炉により焼成したのち粉砕し
た。以上のようにして蛍光体粒子の結晶のよい高
揮度なユーロピウム付活希土類酸化物蛍光体が得
られた。 Next, 0.005 mole of gallium oxide (Ga 2 O 3 ) was added to 1 mole of this mixed rare earth oxide, mixed thoroughly in a ball mill, and then packed in a quartz crucible.
After firing in an electric furnace at 1400°C for 5 hours, it was pulverized. As described above, a europium-activated rare earth oxide phosphor with high volatility and good crystallization of phosphor particles was obtained.
実施例 ２
実施例１の混合希土類酸化物１モルに対し燐酸
ガリウム（GaPO4）0.01モルを添加し、ボールミ
ルで充分混合した後、石英ルツボに詰めて1350℃
で５時間電気炉により焼成したのち粉砕した。以
上のようにして蛍光体粒子の結晶のよい高輝度な
ユーロピウム付活希土類酸化物蛍光体が得られ
た。Example 2 0.01 mole of gallium phosphate (GaPO 4 ) was added to 1 mole of the mixed rare earth oxide of Example 1, and after thorough mixing in a ball mill, the mixture was packed in a quartz crucible and heated at 1350°C.
After firing in an electric furnace for 5 hours, the mixture was pulverized. In the manner described above, a high-brightness europium-activated rare earth oxide phosphor with good crystallization of phosphor particles was obtained.
実施例 ３
酸化ガドリニウム（Gd2O3）445.5ｇと酸化ユ
ーロピウム（Eu2O3）22.5ｇを実施例１と同様な
方法を用いて混合希土類酸化物を作る。この混合
希土類酸化物１モルに対し、酸化ガリウム
（Ga2O3）を0.005モル添加し、ボールミルで充分
混合した後、石英ルツボに詰めて1350℃で５時間
で電気炉により焼成したのち粉砕した。以上のよ
うにして蛍光体粒子の結晶のよい高輝度なユーロ
ピウム付活希土類酸化物蛍光体が得られた。Example 3 A mixed rare earth oxide is prepared using 445.5 g of gadolinium oxide (Gd 2 O 3 ) and 22.5 g of europium oxide (Eu 2 O 3 ) in the same manner as in Example 1. To 1 mol of this mixed rare earth oxide, 0.005 mol of gallium oxide (Ga 2 O 3 ) was added, thoroughly mixed in a ball mill, packed in a quartz crucible, fired in an electric furnace at 1350°C for 5 hours, and then pulverized. . In the manner described above, a high-brightness europium-activated rare earth oxide phosphor with good crystallization of phosphor particles was obtained.
上述のように本発明の製造方法によれば粒子結
晶がよく後処理を必要としないばかりでなく、輝
度の高い赤色に発光するユーロピウム付活希土類
酸化物蛍光体を提供できる。
As described above, according to the manufacturing method of the present invention, it is possible to provide a europium-activated rare earth oxide phosphor that not only has good crystal grains and does not require post-treatment, but also emits red light with high brightness.
第１図及び第２図は本発明の実験過程における
実験結果を示す図であり、第１図はGaの添加量
による蛍光体の相対輝度を示すグラフ、第２図は
焼成温度により蛍光体の相対輝度を示すグラフで
ある。
１……Ga2O3中のGaの添加量と相対輝度の関
係を示す曲線、２……GaPO4中のGaの添加量と
相対輝度の関係を示す曲線、３……焼成温度と相
対輝度の関係を示す曲線。
Figures 1 and 2 are diagrams showing experimental results in the experimental process of the present invention. Figure 1 is a graph showing the relative brightness of the phosphor depending on the amount of Ga added, and Figure 2 is a graph showing the relative brightness of the phosphor depending on the firing temperature. It is a graph showing relative brightness. 1... Curve showing the relationship between the amount of Ga added in Ga 2 O 3 and relative brightness, 2... Curve showing the relationship between the amount of Ga added in GaPO 4 and relative brightness, 3... Curve showing the relationship between the amount of Ga added in GaPO 4 and relative brightness. A curve that shows the relationship between
Claims (1)
物および酸化ガドリニウムもしくはガドリニウム
化合物のうち少くともいずれか１つと、酸化ユー
ロピウムもしくはユーロピウム化合物とを前記酸
化ユーロピウムｘモルに対して前記酸化イツトリ
ウムもしくは前記ガドリニウムのうちの少くとも
１つが（１−ｘ）モルとなるような割合で混合
し、全酸化物に換算した時の混合希土類酸化物の
組成が（L1-x，Eux）2O3で表わされる混合希土類
酸化物を形成し、この混合希土類酸化物１モルに
対し、ガリウムとして２×10-3モル乃至３×10-2
モルの範囲となる割合の酸化ガリウム、燐酸ガリ
ウムなどのガリウム化合物のうちの少くとも１つ
を添加混合し、空気中もしくは酸化性雰囲気中で
1200℃乃至1500℃の温度で焼成したのち、粉砕す
ることを特徴とするユーロピウム付活希土類酸化
物蛍光体の製造方法。 但しＬはイツトリウム、ガドリニウムのうちの
少くとも１つ、ｘは10-3＜ｘ＜２×10-1を満足す
る数である。[Scope of Claims] 1. At least one of yttrium oxide or a yttrium compound, and gadolinium oxide or a gadolinium compound, and europium oxide or a europium compound, based on x moles of the europium oxide, of the yttrium oxide or the gadolinium. The composition of the mixed rare earth oxide when converted to total oxide is expressed as (L 1-x , Eu x ) 2 O 3 A mixed rare earth oxide is formed, and 2×10 -3 mol to 3×10 -2 gallium is added to 1 mol of the mixed rare earth oxide.
At least one of gallium compounds such as gallium oxide and gallium phosphate is added and mixed in a molar ratio, and the mixture is mixed in air or in an oxidizing atmosphere.
A method for producing a europium-activated rare earth oxide phosphor, which comprises firing at a temperature of 1200°C to 1500°C and then pulverizing it. However, L is at least one of yttrium and gadolinium, and x is a number satisfying 10 −3 <x<2×10 −1 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12452184A JPS614783A (en) | 1984-06-19 | 1984-06-19 | Production of europium-activated rare earth element oxide phosphor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12452184A JPS614783A (en) | 1984-06-19 | 1984-06-19 | Production of europium-activated rare earth element oxide phosphor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS614783A JPS614783A (en) | 1986-01-10 |
| JPH0430432B2 true JPH0430432B2 (en) | 1992-05-21 |
Family
ID=14887539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12452184A Granted JPS614783A (en) | 1984-06-19 | 1984-06-19 | Production of europium-activated rare earth element oxide phosphor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS614783A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0794658B2 (en) * | 1986-02-14 | 1995-10-11 | 化成オプトニクス株式会社 | High color rendering fluorescent lamp |
-
1984
- 1984-06-19 JP JP12452184A patent/JPS614783A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS614783A (en) | 1986-01-10 |
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