JPH0238482A - Coated electroluminescent phosphor - Google Patents
Coated electroluminescent phosphorInfo
- Publication number
- JPH0238482A JPH0238482A JP1142296A JP14229689A JPH0238482A JP H0238482 A JPH0238482 A JP H0238482A JP 1142296 A JP1142296 A JP 1142296A JP 14229689 A JP14229689 A JP 14229689A JP H0238482 A JPH0238482 A JP H0238482A
- Authority
- JP
- Japan
- Prior art keywords
- copper
- phosphor
- zinc sulfide
- coating
- activated zinc
- 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.)
- Granted
Links
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 238000000576 coating method Methods 0.000 claims abstract description 20
- 229910052802 copper Inorganic materials 0.000 claims abstract description 20
- 239000010949 copper Substances 0.000 claims abstract description 20
- 239000011248 coating agent Substances 0.000 claims abstract description 19
- -1 copper-activated zinc sulfide Chemical class 0.000 claims abstract description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 239000011572 manganese Substances 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims description 10
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 7
- 238000009792 diffusion process Methods 0.000 abstract description 5
- 230000006866 deterioration Effects 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 2
- 229910052593 corundum Inorganic materials 0.000 abstract 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 2
- 229910001868 water Inorganic materials 0.000 description 7
- 239000005083 Zinc sulfide Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000002243 precursor Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910052984 zinc sulfide Inorganic materials 0.000 description 5
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 238000002144 chemical decomposition reaction Methods 0.000 description 4
- 229940046892 lead acetate Drugs 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000011253 protective coating Substances 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005401 electroluminescence Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000001198 high resolution scanning electron microscopy Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/88—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing selenium, tellurium or unspecified chalcogen elements
- C09K11/881—Chalcogenides
- C09K11/883—Chalcogenides with zinc or cadmium
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
- C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/58—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing copper, silver or gold
- C09K11/582—Chalcogenides
- C09K11/584—Chalcogenides with zinc or cadmium
Abstract
Description
【発明の詳細な説明】
１１上立１−玉Ｉ
本発明は、湿分に対して耐性があり且つ比較的化学的に
不活性であるコーティング付きエレクトロルミネセンス
蛍光体に関する。特には、本蛍光体は、非粒状でありそ
して微視的に均質な酸化アルミニウムコーティングで被
覆される。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to coated electroluminescent phosphors that are resistant to moisture and relatively chemically inert. In particular, the phosphor is coated with a non-particulate and microscopically homogeneous aluminum oxide coating.
ｉ吋至１１
エレクトロルミネセンス蛍光体として、銅賦活硫化亜鉛
、銅及びマンガン賦活硫化亜鉛、銅賦活硫化亜鉛−セレ
ン化亜鉛等に代表される物質が知られている。絶縁媒体
中に埋設されそして交流電界により励起される粉末状の
これら硫化亜鉛蛍光体のエレクトロルミネセンスは、最
初の輝度からほぼ双曲線をなして劣化するのが普通であ
る。輝度対時間曲線が最初の輝度の半分で引かれた水平
線と交差する時点が半減期である。As electroluminescent phosphors, substances typified by copper-activated zinc sulfide, copper and manganese-activated zinc sulfide, copper-activated zinc sulfide-zinc selenide, and the like are known. The electroluminescence of these zinc sulfide phosphors in powder form embedded in an insulating medium and excited by an alternating electric field typically deteriorates approximately hyperbolically from the initial brightness. The half-life is the point at which the luminance versus time curve intersects a horizontal line drawn at half the initial luminance.
良土技韮
これまで、銅賦活硫化亜鉛エレクトロルミネセンス蛍光
体を対象として、その輝度劣化を目的として対策が考慮
されたことはなかった。Until now, no countermeasures have been considered for copper-activated zinc sulfide electroluminescent phosphors to reduce their brightness.
が しよ とする 題
硫化亜鉛エレクトロルミネセンス蛍光体における劣化は
、硫化亜鉛結晶を通して発現する欠陥からの賦活剤とし
ての銅の拡散により起こるものと考えられる。この拡散
は欠陥の線に沿っての電気抵抗の増大をもたらし、その
結果として輝度が減少する。The deterioration in zinc sulfide electroluminescent phosphors is thought to occur due to the diffusion of copper as an activator from defects developed through zinc sulfide crystals. This diffusion results in an increase in electrical resistance along the defect line, resulting in a decrease in brightness.
銅の拡散は、水及び電界の存在下で硫化亜鉛表面の電気
分解により発生する硫化物イオン空孔の存在により起こ
る。Copper diffusion occurs due to the presence of sulfide ion vacancies generated by electrolysis of the zinc sulfide surface in the presence of water and an electric field.
エレクトロルミネセンス蛍光体の半減期を増大するため
には、銅原子の拡散を阻止することが必要である。In order to increase the half-life of electroluminescent phosphors, it is necessary to inhibit the diffusion of copper atoms.
本発明の目的は、銅賦活硫化亜鉛エレクトロルミネセン
ス蛍光体を対象として、その輝度劣化を延長する対策を
講じることである。An object of the present invention is to take measures to prolong the brightness deterioration of copper-activated zinc sulfide electroluminescent phosphors.
・８を ゛するための １
本発明者は、こうした課題が酸化アルミニウムのコーテ
ィングにより有効に防止し得ることを見出した。・To achieve 8.1 The present inventor has found that such problems can be effectively prevented by coating with aluminum oxide.
本発明に従えば、銅賦活硫化亜鉛、銅及びマンガン賦活
硫化亜鉛或いは銅賦活硫化亜鉛−七しン化亜鉛でありそ
して約５μｍ未満直径から約８０μｍ直径の粒寸を有す
るコーティング付きエレクトロルミネセンス蛍光体が提
供される。該コーティングは約１００〜４００人厚さで
あり、実質上酸化アルミニウムから成り、湿分に対して
耐性があり且つ比較的化学的に不活性である。In accordance with the present invention, the coated electroluminescent fluorescent material is copper-activated zinc sulfide, copper and manganese-activated zinc sulfide, or copper-activated zinc sulfide-zinc heptadide and has a particle size of less than about 5 μm in diameter to about 80 μm in diameter. The body is provided. The coating is about 100-400 mm thick and consists essentially of aluminum oxide, which is resistant to moisture and relatively chemically inert.
日の一本白・手口
本発明のコーティング付き蛍光体は約５μｍ未満直径か
ら約８０μｍ直径の粒寸な有するエレクトロルミネセン
ス蛍光体である。最も代表的な蛍光体の例は、銅賦活硫
化亜鉛、銅及びマンガン賦活硫化亜鉛或いは銅賦活硫化
亜鉛−セレン化亜鉛である。The coated phosphor of the present invention is an electroluminescent phosphor having a particle size of less than about 5 μm in diameter to about 80 μm in diameter. The most typical examples of phosphors are copper-activated zinc sulfide, copper and manganese-activated zinc sulfide, or copper-activated zinc sulfide-zinc selenide.
コーティングは、酸化アルミニウムから成りそして通常
約１００〜４００人厚さを有する。コーティング厚さは
米国特許第４．５８５．６７３号に記載されるのと類似
の態様で測定される。The coating consists of aluminum oxide and usually has a thickness of about 100-400 mm. Coating thickness is measured in a manner similar to that described in US Pat. No. 4,585,673.
コーティングは、蛍光体に対して防湿性及び化学的不活
性を付与する。本発明の利点は、本コーテイング付きエ
レクトロルミネセンス蛍光体を使用するランプ装置の有
用寿命が増大することである。The coating provides moisture resistance and chemical inertness to the phosphor. An advantage of the present invention is that the useful life of lamp devices using the coated electroluminescent phosphors is increased.
蛍光体をコーティングする方法は、米国特許第４、５８
５．６７３号に開示される。ここでもその方法が有効に
使用され得る。A method of coating phosphor is described in U.S. Pat. No. 4,58
No. 5.673. The method can be effectively used here as well.
米国特許第４．５８５．６７３号は、個々の蛍光体粒子
の表面に連続した保護コーティングを形成する方法に関
係する。この方法は、蛍光体粒子を流動床状態で浮遊さ
せながら、蛍光体粉末の個々の粒子に保護コーティング
を化学的に蒸着することと関与する。この過程中、流動
化した粒子は、気化されたコーティング先駆物質に先駆
物質の分解温度より低い第１温度で曝される。先駆物質
は第２温度で反応せしめられて所望のコーテイング物質
を形成する。この第２温度は、先駆物質が反応せしめら
れて所望のコーテイング物質を形成する温度以上とされ
る。US Pat. No. 4,585,673 relates to a method of forming a continuous protective coating on the surface of individual phosphor particles. This method involves chemically depositing a protective coating onto individual particles of phosphor powder while the phosphor particles are suspended in a fluidized bed. During this process, the fluidized particles are exposed to a vaporized coating precursor at a first temperature below the decomposition temperature of the precursor. The precursors are reacted at a second temperature to form the desired coating material. The second temperature is above the temperature at which the precursor is reacted to form the desired coating material.
酸化アルミニウムコーティングに対する先駆物質は米国
特許第４．５８５．６７３号に開示される。Precursors to aluminum oxide coatings are disclosed in US Pat. No. 4,585,673.
コーティングは、化学的蒸着により形成されるために粒
子周囲に均一に膜堆積が起こるから、非粒状性（ｎｏｎ
−ｐａｒｔｉｃｕｌａｔｅ ｎａｔｕｒｅ ）を有しそ
して粒子周囲に沿って良好な整合性（（＋Ｈ１ｆｏｒｍ
ａｔｉｏｎａｌｎａｔｕｒｅ ）を有する。「整合性が
よい」とは、高分解能走査型電子顕微鏡の下で蛍光体粒
子のサブミクロン特性が繰り返されて、微視的な均一性
が維持されるることを意味する。コーティングは米国特
許第４．５８５．６７３号に記載されるのと同じ物理的
特性を有する。The coating is non-granular because it is formed by chemical vapor deposition, resulting in uniform film deposition around the particles.
-particulate nature ) and good integrity along the particle periphery ((+H1form
ational nature). By "good consistency" is meant that the submicron characteristics of the phosphor particles are repeated to maintain microscopic uniformity under high-resolution scanning electron microscopy. The coating has the same physical properties as described in US Pat. No. 4,585,673.
本発明をもっと詳しく例示するために、以下に実施例及
び比較例を呈示する。In order to illustrate the invention in more detail, Examples and Comparative Examples are presented below.
例
本発明のコーティング付き蛍光体の湿分及び化学的劣化
に対する耐性を示すために、コーティング付き硫化亜鉛
蛍光体と比較目的のコーティング無し蛍光体について次
の試験を行なった。EXAMPLE To demonstrate the resistance of the coated phosphors of the present invention to moisture and chemical degradation, the following tests were conducted on coated zinc sulfide phosphors and a comparative uncoated phosphor.
約１０ｇの蛍光体をプラスチック製蓋の付いた３０ｃｃ
容量のガラスびん内に置いた。約４滴のＨ２０／ＨＣＩ
溶液を異なった酸濃度で蛍光体に混合した。酢酸鉛紙片
をＷ形に折りそして蛍光体の上方に吊した。この紙片を
２滴の水で加湿した。びんを蓋で密封し、全体をアルミ
ニウム箔で覆いそして室温で２４時間放置せしめた。も
しＨ２Ｓが発生したなら、酢酸鉛紙片はある程度まで黒
色に変わる。Approximately 10g of phosphor in a 30cc container with a plastic lid
Placed in a capacitive glass bottle. Approximately 4 drops of H20/HCI
Solutions were mixed with phosphor at different acid concentrations. A piece of lead acetate paper was folded into a W shape and hung above the phosphor. The paper strip was moistened with two drops of water. The bottle was sealed with a lid, covered entirely with aluminum foil and allowed to stand at room temperature for 24 hours. If H2S is generated, the lead acetate paper strip will turn black to some extent.
次の試験において、以下に示す約４滴のＨ２Ｏ：ＨＣＩ
溶液（滴９滴）を約１０ｇのコーティング無し蛍光体に
加えた。酢酸鉛紙は約２滴の水で加湿した。In the following test, approximately 4 drops of H2O:HCI as shown below
The solution (9 drops) was added to approximately 10 g of uncoated phosphor. The lead acetate paper was moistened with about 2 drops of water.
コーティング無し蛍光体
例３ ２００：１ ２４時間後茶色
例４ ４００：１ ２４時間後白色
本発明のコーティング付き蛍光体について次の試験を為
した。約Ｌｏｇの蛍光体を使用した。約４滴の酸溶液（
滴：滴）を使用した。酢酸鉛紙は約２滴の水で加湿した
。Uncoated phosphor Example 3 200:1 Brown after 24 hours Example 4 400:1 White after 24 hours The following tests were conducted on the coated phosphor of the present invention. Approximately Log phosphor was used. Approximately 4 drops of acid solution (
Drops: Drops) were used. The lead acetate paper was moistened with about 2 drops of water.
コーティング付き蛍光体
例５１
例６５
例７ １０
例８ ２０
例９ ４０
０：１
０．１
０：１
０：１
２４時間後薄い茶色
２４時間後も白色
２４時間後も白色
２４時間後も白色
２４時間後も白色
以上に示されるように、本発明のコーティング付き蛍光
体は、それが腐食性の酸溶液と接触状態に置かれるとき
でも白色のままかせいぜい薄い色となるだけである事実
かられかるように、化学的劣化に対して高い耐性を示し
、他方コーティング無し蛍光体は黒色に変り、これは酸
との接触に対しての化学的劣化を示す。Coated phosphor example 51 Example 65 Example 7 10 Example 8 20 Example 9 40 0:1 0.1 0:1 0:1 Light brown after 24 hours White after 24 hours White after 24 hours White after 24 hours As shown above, the coated phosphor of the present invention is distinguished by the fact that it remains white, or at most becomes pale in color, even when it is placed in contact with corrosive acid solutions. As such, it exhibits high resistance to chemical degradation, while the uncoated phosphor turns black, indicating chemical degradation upon contact with acids.
コーティング付き蛍光体は化学的劣化に対して耐性があ
ることから、それが水分に対しても耐性があることは充
分推察される。本コーテイング付き蛍光体が耐水性を有
することを更に実証するため、これら材料を試験ランプ
の作製に使用した。Since the coated phosphor is resistant to chemical degradation, it is reasonable to assume that it is also resistant to moisture. To further demonstrate that the present coated phosphors are water resistant, these materials were used to make test lamps.
次のデータが本発明のコーティング付き蛍光体使用ラン
プ（Ａ）及びコーティングの無い同じ蛍光体を使用する
ランプ（Ｂ）に対して得られた。The following data were obtained for a lamp using a coated phosphor of the present invention (A) and a lamp using the same phosphor without a coating (B).
半減期
５０℃−３０％ＲＨ７０℃−９０％ＲＨランプ
１００Ｖ／４００ Ｈ２１００Ｖ／４００ Ｈ２Ｂ
２２０ ５０Ａ ４２
０ １３０半減期は、最初の輝度の半分に至るに
要した時間数として定義される。Half-life 50℃-30%RH 70℃-90%RH lamp
100V/400 H2100V/400 H2B
220 50A 42
0 130 Half-life is defined as the number of hours required to reach half of the initial brightness.
コーティング付き蛍光体はコーティングの無い蛍光体よ
り格段に長い寿命特性を示す。この寿命改善の理由はそ
の防湿性にある。Coated phosphors exhibit significantly longer lifetime characteristics than uncoated phosphors. The reason for this improved lifespan is its moisture resistance.
ｌ肛皇力】
エレクトロルミネセンス蛍光体を湿分に対して耐性があ
り且つ比較的化学的に不活性とすることによりその半減
期を増大することに成功した。We have succeeded in increasing the half-life of electroluminescent phosphors by making them resistant to moisture and relatively chemically inert.
以上、本発明の具体例について説明したが、本発明の範
囲内で多くの変更を為しうることを銘記されたい。Although specific examples of the invention have been described above, it should be noted that many changes may be made within the scope of the invention.
Claims (1)
に銅賦活硫化亜鉛−セレン化亜鉛から成る群から選択さ
れそして約５μｍ未満直径から約８０μｍ直径までの粒
寸を有し、実質上酸化アルミニウムから成るコーティン
グを有し、そして湿分に対して耐性があり且つ比較的化
学的に不活性であるコーティング付きエレクトロルミネ
センス蛍光体。 ２）コーティングが整合性のある酸化アルミニウムの非
粒状コーティングである特許請求の範囲出し１項記載の
蛍光体。Claims: 1) selected from the group consisting of copper-activated zinc sulfide, copper and manganese-activated zinc sulfide, and copper-activated zinc sulfide-zinc selenide and having a particle size from less than about 5 μm in diameter to about 80 μm in diameter. , a coated electroluminescent phosphor having a coating consisting essentially of aluminum oxide and which is resistant to moisture and relatively chemically inert. 2) The phosphor of claim 1, wherein the coating is a non-granular coating of conformal aluminum oxide.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US20481088A | 1988-06-10 | 1988-06-10 | |
| US204810 | 1988-06-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0238482A true JPH0238482A (en) | 1990-02-07 |
| JP3210655B2 JP3210655B2 (en) | 2001-09-17 |
Family
ID=22759527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14229689A Expired - Lifetime JP3210655B2 (en) | 1988-06-10 | 1989-06-06 | Electroluminescent lamp |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3210655B2 (en) |
| DE (1) | DE3913182C2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02113085A (en) * | 1988-10-21 | 1990-04-25 | Nichia Chem Ind Ltd | Fluorescent substance for el panel |
| JPH04230996A (en) * | 1990-04-25 | 1992-08-19 | Minnesota Mining & Mfg Co <3M> | Capsulated electro luminescent phosphor material and manufacture thereof |
| US5469019A (en) * | 1993-02-24 | 1995-11-21 | Nec Corporation | Thin electroluminescent lamp and process for fabricating the same |
| WO1996009353A1 (en) * | 1994-09-20 | 1996-03-28 | Hitachi, Ltd. | Phosphor, and cathode-ray tube and display using the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5428784A (en) * | 1977-08-08 | 1979-03-03 | Dainippon Toryo Co Ltd | Pigment coated fluorescent body and method of producing the same |
| JPS59105074A (en) * | 1982-12-09 | 1984-06-18 | Muto Heihachiro | Fluophor |
| JPS6123678A (en) * | 1984-05-07 | 1986-02-01 | ジーティーイー・プロダクツ・コーポレイション | Method of coating fluorescent substance particle, fluorescent substance particle, fluorescent lamp and manufacture |
| JPH01284583A (en) * | 1988-05-12 | 1989-11-15 | Mitsubishi Metal Corp | El phosphor based on dispersed zns |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2586304A (en) * | 1948-06-12 | 1952-02-19 | Westinghouse Electric Corp | Protection of phosphors from attack by alkali vapors |
| US4442136A (en) * | 1982-03-02 | 1984-04-10 | Texas Instruments Incorporated | Electroluminescent display with laser annealed phosphor |
| US4585673A (en) * | 1984-05-07 | 1986-04-29 | Gte Laboratories Incorporated | Method for coating phosphor particles |
-
1989
- 1989-04-21 DE DE19893913182 patent/DE3913182C2/en not_active Expired - Lifetime
- 1989-06-06 JP JP14229689A patent/JP3210655B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5428784A (en) * | 1977-08-08 | 1979-03-03 | Dainippon Toryo Co Ltd | Pigment coated fluorescent body and method of producing the same |
| JPS59105074A (en) * | 1982-12-09 | 1984-06-18 | Muto Heihachiro | Fluophor |
| JPS6123678A (en) * | 1984-05-07 | 1986-02-01 | ジーティーイー・プロダクツ・コーポレイション | Method of coating fluorescent substance particle, fluorescent substance particle, fluorescent lamp and manufacture |
| JPH01284583A (en) * | 1988-05-12 | 1989-11-15 | Mitsubishi Metal Corp | El phosphor based on dispersed zns |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02113085A (en) * | 1988-10-21 | 1990-04-25 | Nichia Chem Ind Ltd | Fluorescent substance for el panel |
| JPH04230996A (en) * | 1990-04-25 | 1992-08-19 | Minnesota Mining & Mfg Co <3M> | Capsulated electro luminescent phosphor material and manufacture thereof |
| US5469019A (en) * | 1993-02-24 | 1995-11-21 | Nec Corporation | Thin electroluminescent lamp and process for fabricating the same |
| WO1996009353A1 (en) * | 1994-09-20 | 1996-03-28 | Hitachi, Ltd. | Phosphor, and cathode-ray tube and display using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3913182A1 (en) | 1989-12-21 |
| DE3913182C2 (en) | 1999-10-21 |
| JP3210655B2 (en) | 2001-09-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5244750A (en) | Coated electroluminescent phosphor | |
| JP2756044B2 (en) | Encapsulated electroluminescent phosphor and method of making same | |
| US2566349A (en) | Electroluminescent lamp | |
| JP3187481B2 (en) | Moisture-insensitive zinc sulfide-based luminescent material and method of making same | |
| US4855189A (en) | Electroluminescent lamps and phosphors | |
| JPH06184530A (en) | Improved electroluminescent device | |
| WO1996039793A1 (en) | Electroluminescent lamp having a terpolymer binder | |
| JP2006124680A (en) | Improved phosphor particulate powder, its production process and el element using the same | |
| JPH04245162A (en) | Low pressure mercury vapor electric discharge lamp | |
| JPH0625857A (en) | Method for coating minute material with titania, and moisture-insensitive zinc sulfide luminescent material produced therefrom | |
| US5094185A (en) | Electroluminescent lamps and phosphors | |
| JPH0238482A (en) | Coated electroluminescent phosphor | |
| US2948635A (en) | Phosphor evaporation method and apparatus | |
| US3963954A (en) | Fluorescent lamp having indium oxide conductive coating and a protective coating therefor | |
| US4661373A (en) | Dispersion electroluminescent element | |
| JPH11256150A (en) | Electroluminescent fluorescent substance, its production and el panel | |
| US4961956A (en) | Electroluminescent lamps and phosphors | |
| US3440471A (en) | Electroluminescent cell matrix material of improved stability | |
| US5853554A (en) | Composition and method for preparing phosphor films exhibiting decreased coulombic aging | |
| GB952630A (en) | Method of forming thin films of luminescent material and product resulting therefrom | |
| JP2007180026A (en) | Slurry composite for membrane formation, fluorescent lamp manufactured using this composite, and its manufacturing method | |
| JPH04356584A (en) | Stimulable phosphor for el lamp | |
| US2848637A (en) | Electroluminescent lamp | |
| JPS608074B2 (en) | EL light emitting element | |
| JPH06248261A (en) | Electroluminescent element |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070713 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080713 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090713 Year of fee payment: 8 |
|
| EXPY | Cancellation because of completion of term |