JPH07188651A - Electroluminescent fluorescencer and its production - Google Patents
Electroluminescent fluorescencer and its productionInfo
- Publication number
- JPH07188651A JPH07188651A JP33531693A JP33531693A JPH07188651A JP H07188651 A JPH07188651 A JP H07188651A JP 33531693 A JP33531693 A JP 33531693A JP 33531693 A JP33531693 A JP 33531693A JP H07188651 A JPH07188651 A JP H07188651A
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- Japan
- Prior art keywords
- phosphor
- activator
- electroluminescent
- fluorescencer
- zns
- 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
【０００１】[0001]
【産業上の利用分野】本発明は、有機分散型の電場発光
蛍光体およびその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic dispersion type electroluminescent phosphor and a method for producing the same.
【０００２】[0002]
【従来の技術】有機分散型の電場発光蛍光体（以下、Ｅ
Ｌ蛍光体と称する）は、これを誘電物質中に分散させて
発光体層を形成し、この発光体層の両側に電極を配置す
ると共に、少なくとも一方の電極を透明電極にて構成
し、これら電極間に交流電圧を印加することにより発光
させるものである。このようなＥＬ蛍光体としては、硫
化亜鉛(ZnS) を母体とし、これに付活剤として銅やマン
ガン、また共付活剤として塩素、臭素、よう素、アルミ
ニウム等を含有させたものが一般的に用いられている。2. Description of the Related Art Organic dispersion type electroluminescent phosphors (hereinafter referred to as E
L phosphor) is dispersed in a dielectric material to form a light emitter layer, electrodes are arranged on both sides of this light emitter layer, and at least one electrode is composed of a transparent electrode. Light is emitted by applying an AC voltage between the electrodes. As such an EL phosphor, it is common to use zinc sulfide (ZnS) as a base material, and add copper or manganese as an activator and chlorine, bromine, iodine, aluminum or the like as a co-activator. It is used for.
【０００３】上述したようなＥＬ蛍光体を用いた有機分
散型ＥＬパネルは、液晶表示装置のバックライト等をは
じめとする電子機器における平面型発光装置等として開
発が進められてきたが、最近、新規用途として道路標識
の夜間照明等への適用が検討されており、今後このよう
な屋外用途が増加するものと考えられている。The organic dispersion type EL panel using the EL phosphor as described above has been developed as a flat type light emitting device or the like in electronic equipment such as a backlight of a liquid crystal display device. As a new application, the application of road signs to night lighting is being studied, and it is considered that such outdoor applications will increase in the future.
【０００４】しかし、有機分散型ＥＬパネルに用いられ
るＥＬ蛍光体は、上述したように硫化亜鉛を母体として
いるため、紫外線の照射により結晶表面と吸着水分が反
応して金属亜鉛が析出し、体色が黒化して大幅に発光輝
度が低下することが明らかになっている。屋外では、紫
外線による影響が大きいため、上記紫外線照射に伴う発
光輝度の低下を防止することが重要となる。However, since the EL phosphor used in the organic dispersion type EL panel has zinc sulfide as the base material as described above, the crystal surface and the adsorbed water react with each other by the irradiation of ultraviolet rays to precipitate metallic zinc, and It has been clarified that the color becomes black and the emission luminance is significantly reduced. Since the influence of ultraviolet rays is great outdoors, it is important to prevent the decrease of the emission brightness due to the irradiation of ultraviolet rays.
【０００５】[0005]
【発明が解決しようとする課題】上述したように、従来
のＥＬ蛍光体を用いた有機分散型ＥＬパネルは、紫外線
の照射により発光輝度が大幅に低下するという問題を有
していた。このようなことから、例えば屋外用途への適
応を図るために、ＥＬ蛍光体に対する紫外線照射に伴う
発光輝度の低下対策が強く望まれている。As described above, the organic dispersion type EL panel using the conventional EL phosphor has a problem that the emission brightness is significantly reduced by the irradiation of ultraviolet rays. For this reason, in order to adapt to, for example, outdoor applications, it is strongly desired to take measures to reduce the emission brightness of the EL phosphor due to ultraviolet irradiation.
【０００６】本発明は、このような課題に対処するため
になされたもので、実用上十分な耐紫外線性を付与する
と共に、蛍光体本来の特性を十分に発揮させることを可
能にした電場発光蛍光体を提供することを目的としてい
る。The present invention has been made in order to solve such a problem, and it is possible to impart sufficient ultraviolet resistance in practical use, and at the same time, it is possible to sufficiently exhibit the original characteristics of the phosphor. It is intended to provide a phosphor.
【０００７】[0007]
【課題を解決するための手段】本発明の電場発光蛍光体
は、硫化亜鉛を母体とし、これに付活剤として銅および
マンガンから選ばれた少なくとも 1種と、共付活剤とし
て塩素、臭素、よう素およびアルミニウムから選ばれた
少なくとも 1種とを含有させた電場発光蛍光体であっ
て、その蛍光体粒子表面に、 0.1〜 2重量% の珪酸亜鉛
が被覆されていることを特徴としている。The electroluminescent phosphor of the present invention comprises zinc sulfide as a base material, at least one selected from copper and manganese as an activator, and chlorine and bromine as coactivators. , An electroluminescent phosphor containing at least one selected from iodine and aluminum, characterized in that the phosphor particle surface is coated with 0.1 to 2% by weight of zinc silicate. .
【０００８】本発明の電場発光蛍光体は、その粒子表面
が珪酸亜鉛により被覆されているものである。この珪酸
亜鉛による被覆量は、蛍光体粒子に対して 0.1〜 2重量
% の範囲とする。被覆量が 0.1重量% 未満であると、蛍
光体粒子を覆うのに不十分となり、十分な耐紫外線性が
得られず、また 2重量% を超えると、蛍光体の発光輝度
を低下させてしまう。The electroluminescent phosphor of the present invention has a particle surface coated with zinc silicate. The coating amount with this zinc silicate is 0.1 to 2 weight per phosphor particle.
The range is%. If the coating amount is less than 0.1% by weight, it becomes insufficient to cover the phosphor particles and sufficient UV resistance cannot be obtained, and if it exceeds 2% by weight, the emission brightness of the phosphor is reduced. .
【０００９】本発明の珪酸亜鉛被覆を有する電場発光蛍
光体は、例えば以下のようにして製造される。The electroluminescent phosphor having the zinc silicate coating of the present invention is manufactured, for example, as follows.
【００１０】まず、硫化亜鉛を母材とし、これに付活剤
として銅およびマンガンから選ばれた少なくとも 1種
と、共付活剤として塩素、臭素、よう素およびアルミニ
ウムから選ばれた少なくとも 1種とを混合して原料物質
を調製する。次いで、この原料物質を焼成した後、しか
るべき洗浄処理を施して電場発光蛍光体を得る。First, zinc sulfide is used as a base material, and at least one selected from copper and manganese as an activator and at least one selected from chlorine, bromine, iodine and aluminum as a co-activator. And are mixed to prepare a raw material. Next, after firing this raw material, an appropriate washing treatment is applied to obtain an electroluminescent phosphor.
【００１１】次に、上記電場発光蛍光体の分散液中に、
珪酸原料を含む水溶液、例えば水ガラスの水溶液を添加
して十分に撹拌した後、亜鉛イオンを含む水溶液、例え
ば硫酸亜鉛等の水溶液を適量添加し、この蛍光体懸濁液
を静置して、沈殿反応により蛍光体粒子の表面に珪酸亜
鉛を被覆させる。このようにして、珪酸亜鉛被覆の電場
発光蛍光体が得られる。Next, in the dispersion liquid of the above electroluminescent phosphor,
After adding an aqueous solution containing a silicic acid raw material, for example, an aqueous solution of water glass and stirring sufficiently, an aqueous solution containing zinc ions, for example, an aqueous solution of zinc sulfate or the like is added in an appropriate amount, and this phosphor suspension is allowed to stand, The surface of the phosphor particles is coated with zinc silicate by a precipitation reaction. In this way, an electroluminescent phosphor coated with zinc silicate is obtained.
【００１２】[0012]
【作用】本発明の電場発光蛍光体においては、蛍光体粒
子表面を適量の珪酸亜鉛で被覆している。珪酸亜鉛は、
耐紫外線性に優れているために、結晶表面と吸着水分と
の反応を抑制することができる。これにより、例えば屋
外等で使用した場合においても、体色の黒化による発光
輝度の低下を大幅に抑制することが可能となる。In the electroluminescent phosphor of the present invention, the surface of the phosphor particles is coated with an appropriate amount of zinc silicate. Zinc silicate is
Due to its excellent resistance to ultraviolet rays, the reaction between the crystal surface and adsorbed moisture can be suppressed. As a result, even when used outdoors, for example, it is possible to significantly suppress a decrease in emission luminance due to blackening of the body color.
【００１３】[0013]
【実施例】次に、本発明の実施例について説明する。EXAMPLES Next, examples of the present invention will be described.
【００１４】比較例１ ZnS母体に、付活剤としてCuSO4 と、共付活剤としてNaB
rおよびKBr とを、湿式にて混合し、そのスラリーを乾
燥した後、 H2 S 雰囲気中にて、 900℃で 120分間焼成
して、 ZnS:Cu,Br型ＥＬ蛍光体を得た。Comparative Example 1 A ZnS matrix was prepared by adding CuSO 4 as an activator and NaB as a co-activator.
r and KBr were wet-mixed, and the slurry was dried and then fired at 900 ° C. for 120 minutes in an H 2 S atmosphere to obtain a ZnS: Cu, Br type EL phosphor.
【００１５】このようにして得たＥＬ蛍光体の 550nmで
の反射率を測定した。次いで、上記ＥＬ蛍光体に 365nm
の紫外線を12時間照射した後、同様に 550nmでの反射率
を測定した。その結果、紫外線照射前は反射率が 72.3%
あったのに対し、12時間の紫外線照射後には反射率が 5
4.9%まで低下した。The reflectance of the EL phosphor thus obtained at 550 nm was measured. Next, add 365 nm to the above EL phosphor.
After irradiating it with ultraviolet rays for 12 hours, the reflectance at 550 nm was similarly measured. As a result, the reflectance is 72.3% before UV irradiation.
However, the reflectance was 5 after 12 hours of UV irradiation.
It fell to 4.9%.
【００１６】実施例１ ZnS母体に、付活剤としてCuSO4 と、共付活剤としてNaB
rおよびKBr とを、湿式にて混合し、そのスラリーを乾
燥した後、 H2 S 雰囲気中にて、 900℃で 120分間焼成
して、 ZnS:Cu,Br型ＥＬ蛍光体を得た。Example 1 A ZnS matrix was prepared by using CuSO 4 as an activator and NaB as a co-activator.
r and KBr were wet-mixed, and the slurry was dried and then fired at 900 ° C. for 120 minutes in an H 2 S atmosphere to obtain a ZnS: Cu, Br type EL phosphor.
【００１７】次に、上記 ZnS:Cu,Br型ＥＬ蛍光体100gを
水中に分散させた後、この分散液中に 0.1mol/ｌの水ガ
ラス水溶液を 0.1ccと0.03mol/ｌの硫酸亜鉛水溶液を 1
cc添加し、15分間撹拌した。その後静置して、上澄み液
を捨ててから、脱イオン水で5回洗浄した後、濾過、乾
燥、篩別工程を実施して、目的とする珪酸亜鉛被覆のＥ
Ｌ蛍光体を得た。Next, 100 g of the above ZnS: Cu, Br type EL phosphor was dispersed in water, and 0.1 mol / l of a water glass aqueous solution and 0.1 cc and 0.03 mol / l of a zinc sulfate aqueous solution were dispersed in this dispersion. The 1
cc was added and stirred for 15 minutes. Then, after leaving still, discarding the supernatant liquid, washing with deionized water 5 times, filtration, drying and sieving steps are carried out to obtain the desired zinc silicate-coated E
L phosphor was obtained.
【００１８】このようにして得たＥＬ蛍光体の化学分析
を行った結果、蛍光体粒子の表面に珪酸亜鉛が蛍光体粒
子に対して 0.1重量% 付着していることを確認した。次
に、このＥＬ蛍光体に 365nmの紫外線を12時間照射した
後、 550nmでの反射率を測定した。その結果、反射率は
60.6%であり、黒化が生じていたが、上記比較例１より
は黒化の程度が抑制されることが明かとなった。As a result of chemical analysis of the EL phosphor thus obtained, it was confirmed that zinc silicate was attached to the surface of the phosphor particles in an amount of 0.1% by weight based on the phosphor particles. Next, this EL phosphor was irradiated with 365 nm ultraviolet rays for 12 hours, and then the reflectance at 550 nm was measured. As a result, the reflectance is
It was 60.6% and blackening occurred, but it was revealed that the degree of blackening was suppressed more than in Comparative Example 1 above.
【００１９】実施例２ ZnS母体に、付活剤としてCuSO4 と、共付活剤としてNaB
rおよびKBr とを、湿式にて混合し、そのスラリーを乾
燥した後、 H2 S 雰囲気中にて、 900℃で 120分間焼成
して、 ZnS:Cu,Br型ＥＬ蛍光体を得た。Example 2 CuSO 4 as an activator and NaB as a co-activator were added to a ZnS matrix.
r and KBr were wet-mixed, and the slurry was dried and then fired at 900 ° C. for 120 minutes in an H 2 S atmosphere to obtain a ZnS: Cu, Br type EL phosphor.
【００２０】次に、上記 ZnS:Cu,Br型ＥＬ蛍光体100gを
水中に分散させた後、この分散液中に 0.1mol/ｌの水ガ
ラス水溶液を 0.2ccと0.03mol/ｌの硫酸亜鉛水溶液を 2
cc添加し、15分間撹拌した。その後静置して、上澄み液
を捨ててから、脱イオン水で5回洗浄した後、濾過、乾
燥、篩別工程を実施して、目的とする珪酸亜鉛被覆のＥ
Ｌ蛍光体を得た。Next, 100 g of the above-mentioned ZnS: Cu, Br type EL phosphor was dispersed in water, and then 0.1 cc / l water glass aqueous solution was added to this dispersion and 0.2 cc and 0.03 mol / l zinc sulfate aqueous solution were added. The 2
cc was added and stirred for 15 minutes. Then, after leaving still, discarding the supernatant liquid, washing with deionized water 5 times, filtration, drying and sieving steps are carried out to obtain the desired zinc silicate-coated E
L phosphor was obtained.
【００２１】このようにして得たＥＬ蛍光体の化学分析
を行った結果、蛍光体粒子の表面に珪酸亜鉛が蛍光体粒
子に対して 0.2重量% 付着していることを確認した。次
に、このＥＬ蛍光体に 365nmの紫外線を12時間照射した
後、 550nmでの反射率を測定した。その結果、反射率は
68.7%と若干黒化が生じていたが、上記比較例１よりは
黒化の程度が大幅に抑制されることを確認した。As a result of chemical analysis of the EL phosphor thus obtained, it was confirmed that zinc silicate was attached to the surface of the phosphor particles in an amount of 0.2% by weight based on the phosphor particles. Next, this EL phosphor was irradiated with 365 nm ultraviolet rays for 12 hours, and then the reflectance at 550 nm was measured. As a result, the reflectance is
Although a slight blackening occurred at 68.7%, it was confirmed that the degree of blackening was significantly suppressed as compared with Comparative Example 1 above.
【００２２】実施例３ ZnS母体に、付活剤としてCuSO4 と、共付活剤としてNaB
rおよびKBr とを、湿式にて混合し、そのスラリーを乾
燥した後、 H2 S 雰囲気中にて、 900℃で 120分間焼成
して、 ZnS:Cu,Br型ＥＬ蛍光体を得た。Example 3 A ZnS matrix was prepared by adding CuSO 4 as an activator and NaB as a co-activator.
r and KBr were wet-mixed, and the slurry was dried and then fired at 900 ° C. for 120 minutes in an H 2 S atmosphere to obtain a ZnS: Cu, Br type EL phosphor.
【００２３】次に、上記 ZnS:Cu,Br型ＥＬ蛍光体100gを
水中に分散させた後、この分散液中に 0.1mol/ｌの水ガ
ラス水溶液を 0.3ccと0.03mol/ｌの硫酸亜鉛水溶液を 3
cc添加し、15分間撹拌した。その後静置して、上澄み液
を捨ててから、脱イオン水で5回洗浄した後、濾過、乾
燥、篩別工程を実施して、目的とする珪酸亜鉛被覆のＥ
Ｌ蛍光体を得た。Next, 100 g of the above ZnS: Cu, Br type EL phosphor was dispersed in water, and then 0.1 cc / l of water glass aqueous solution was added to this dispersion and 0.3 cc and 0.03 mol / l of zinc sulfate aqueous solution were added. The 3
cc was added and stirred for 15 minutes. Then, after leaving still, discarding the supernatant liquid, washing with deionized water 5 times, filtration, drying and sieving steps are carried out to obtain the desired zinc silicate-coated E
L phosphor was obtained.
【００２４】このようにして得たＥＬ蛍光体の化学分析
を行った結果、蛍光体粒子の表面に珪酸亜鉛が蛍光体粒
子に対して 0.3重量% 付着していることを確認した。次
に、このＥＬ蛍光体に 365nmの紫外線を12時間照射した
後、 550nmでの反射率を測定した。その結果、反射率は
72.2%であり、比較例１における紫外線照射前と同等の
結果が得られた。As a result of chemical analysis of the EL phosphor thus obtained, it was confirmed that 0.3% by weight of zinc silicate was attached to the surface of the phosphor particles with respect to the phosphor particles. Next, this EL phosphor was irradiated with 365 nm ultraviolet rays for 12 hours, and then the reflectance at 550 nm was measured. As a result, the reflectance is
It was 72.2%, and the same result as that before the ultraviolet irradiation in Comparative Example 1 was obtained.
【００２５】実施例４ ZnS母体に、付活剤としてCuSO4 と、共付活剤としてNaB
rおよびKBr とを、湿式にて混合し、そのスラリーを乾
燥した後、 H2 S 雰囲気中にて、 900℃で 120分間焼成
して、 ZnS:Cu,Br型ＥＬ蛍光体を得た。Example 4 CuSO 4 as an activator and NaB as a co-activator were added to a ZnS matrix.
r and KBr were wet-mixed, and the slurry was dried and then fired at 900 ° C. for 120 minutes in an H 2 S atmosphere to obtain a ZnS: Cu, Br type EL phosphor.
【００２６】次に、上記 ZnS:Cu,Br型ＥＬ蛍光体100gを
水中に分散させた後、この分散液中に 0.1mol/ｌの水ガ
ラス水溶液を 0.5ccと0.03mol/ｌの硫酸亜鉛水溶液を 5
cc添加し、15分間撹拌した。その後静置して、上澄み液
を捨ててから、脱イオン水で5回洗浄した後、濾過、乾
燥、篩別工程を実施して、目的とする珪酸亜鉛被覆のＥ
Ｌ蛍光体を得た。Next, 100 g of the above ZnS: Cu, Br type EL phosphor was dispersed in water, and then 0.5 mol of a 0.1 mol / l water glass aqueous solution and 0.03 mol / l zinc sulfate aqueous solution were added to the dispersion. The 5
cc was added and stirred for 15 minutes. Then, after leaving still, discarding the supernatant liquid, washing with deionized water 5 times, filtration, drying and sieving steps are carried out to obtain the desired zinc silicate-coated E
L phosphor was obtained.
【００２７】このようにして得たＥＬ蛍光体の化学分析
を行った結果、蛍光体粒子の表面に珪酸亜鉛が蛍光体粒
子に対して 0.5重量% 付着していることを確認した。次
に、このＥＬ蛍光体に 365nmの紫外線を12時間照射した
後、 550nmでの反射率を測定した。その結果、反射率は
72.2%であり、比較例１における紫外線照射前と同等の
結果が得られた。As a result of chemical analysis of the EL phosphor thus obtained, it was confirmed that zinc silicate was attached to the surface of the phosphor particles in an amount of 0.5% by weight based on the phosphor particles. Next, this EL phosphor was irradiated with 365 nm ultraviolet rays for 12 hours, and then the reflectance at 550 nm was measured. As a result, the reflectance is
It was 72.2%, and the same result as that before the ultraviolet irradiation in Comparative Example 1 was obtained.
【００２８】実施例５ ZnS母体に、付活剤としてCuSO4 と、共付活剤としてNaB
rおよびKBr とを、湿式にて混合し、そのスラリーを乾
燥した後、 H2 S 雰囲気中にて、 900℃で 120分間焼成
して、 ZnS:Cu,Br型ＥＬ蛍光体を得た。Example 5 CuSO 4 as an activator and NaB as a co-activator were added to a ZnS matrix.
r and KBr were wet-mixed, and the slurry was dried and then fired at 900 ° C. for 120 minutes in an H 2 S atmosphere to obtain a ZnS: Cu, Br type EL phosphor.
【００２９】次に、上記 ZnS:Cu,Br型ＥＬ蛍光体100gを
水中に分散させた後、この分散液中に 0.1mol/ｌの水ガ
ラス水溶液を 1.0ccと0.03mol/ｌの硫酸亜鉛水溶液を10
cc添加し、15分間撹拌した。その後静置して、上澄み液
を捨ててから、脱イオン水で5回洗浄した後、濾過、乾
燥、篩別工程を実施して、目的とする珪酸亜鉛被覆のＥ
Ｌ蛍光体を得た。Next, 100 g of the above ZnS: Cu, Br type EL phosphor was dispersed in water, and then 0.1 mol / l of a water glass aqueous solution was added to this dispersion, 1.0 cc and 0.03 mol / l of a zinc sulfate aqueous solution. A 10
cc was added and stirred for 15 minutes. Then, after leaving still, discarding the supernatant liquid, washing with deionized water 5 times, filtration, drying and sieving steps are carried out to obtain the desired zinc silicate-coated E
L phosphor was obtained.
【００３０】このようにして得たＥＬ蛍光体の化学分析
を行った結果、蛍光体粒子の表面に珪酸亜鉛が蛍光体粒
子に対して 1.0重量% 付着していることを確認した。次
に、このＥＬ蛍光体に 365nmの紫外線を12時間照射した
後、 550nmでの反射率を測定した。その結果、反射率は
72.3%と、比較例１における紫外線照射前と同等の結果
が得られた。As a result of chemical analysis of the EL phosphor thus obtained, it was confirmed that zinc silicate was attached to the surface of the phosphor particles in an amount of 1.0% by weight based on the phosphor particles. Next, this EL phosphor was irradiated with 365 nm ultraviolet rays for 12 hours, and then the reflectance at 550 nm was measured. As a result, the reflectance is
The result was 72.3%, which was equivalent to that before the ultraviolet irradiation in Comparative Example 1.
【００３１】実施例６ ZnS母体に、付活剤としてCuSO4 と、共付活剤としてNaB
rおよびKBr とを、湿式にて混合し、そのスラリーを乾
燥した後、 H2 S 雰囲気中にて、 900℃で 120分間焼成
して、 ZnS:Cu,Br型ＥＬ蛍光体を得た。Example 6 CuSO 4 as an activator and NaB as a co-activator were added to a ZnS matrix.
r and KBr were wet-mixed, and the slurry was dried and then fired at 900 ° C. for 120 minutes in an H 2 S atmosphere to obtain a ZnS: Cu, Br type EL phosphor.
【００３２】次に、上記 ZnS:Cu,Br型ＥＬ蛍光体100gを
水中に分散させた後、この分散液中に 0.1mol/ｌの水ガ
ラス水溶液を 2.0ccと0.03mol/ｌの硫酸亜鉛水溶液を20
cc添加し、15分間撹拌した。その後静置して、上澄み液
を捨ててから、脱イオン水で5回洗浄した後、濾過、乾
燥、篩別工程を実施して、目的とする珪酸亜鉛被覆のＥ
Ｌ蛍光体を得た。Next, 100 g of the above-mentioned ZnS: Cu, Br type EL phosphor was dispersed in water, and then 0.1 mol / l water glass aqueous solution was added to this dispersion to 2.0 cc and 0.03 mol / l zinc sulfate aqueous solution. 20
cc was added and stirred for 15 minutes. Then, after leaving still, discarding the supernatant liquid, washing with deionized water 5 times, filtration, drying and sieving steps are carried out to obtain the desired zinc silicate-coated E
L phosphor was obtained.
【００３３】このようにして得たＥＬ蛍光体の化学分析
を行った結果、蛍光体粒子の表面に珪酸亜鉛が蛍光体粒
子に対して 2.0重量% 付着していることを確認した。次
に、このＥＬ蛍光体に 365nmの紫外線を12時間照射した
後、 550nmでの反射率を測定した。その結果、反射率は
72.3%と、比較例１における紫外線照射前と同等の結果
が得られた。As a result of chemical analysis of the EL phosphor thus obtained, it was confirmed that zinc silicate was attached to the surface of the phosphor particles in an amount of 2.0% by weight based on the phosphor particles. Next, this EL phosphor was irradiated with 365 nm ultraviolet rays for 12 hours, and then the reflectance at 550 nm was measured. As a result, the reflectance is
The result was 72.3%, which was equivalent to that before the ultraviolet irradiation in Comparative Example 1.
【００３４】また、図１に上記各実施例および比較例に
おける反射率の測定結果を珪酸亜鉛の被覆量との関係と
してまとめて示す。同図から明らかなように、珪酸亜鉛
による被覆量の増加に伴って反射率が上昇しており、こ
れにより紫外線照射に伴う発光輝度の低下を大幅に抑制
し得ることが分かる。ただし、珪酸亜鉛による被覆量が
2.0重量% を超えると、蛍光体の発光特性等に悪影響を
与えるため、珪酸亜鉛による被覆量は 2.0重量% 以下と
する。よって、本発明のＥＬ蛍光体を用いて、有機分散
型ＥＬパネルを作製することにより、例えば屋外用途へ
の適応を図ることが可能となる。Further, FIG. 1 collectively shows the measurement results of the reflectance in each of the above Examples and Comparative Examples as a relationship with the coating amount of zinc silicate. As is clear from the figure, the reflectance increases with an increase in the coating amount of zinc silicate, and it can be seen that the decrease in the emission brightness due to the irradiation of ultraviolet rays can be significantly suppressed. However, the amount of coating with zinc silicate is
If it exceeds 2.0% by weight, the luminescent properties of the phosphor are adversely affected, so the coating amount with zinc silicate is 2.0% by weight or less. Therefore, by using the EL phosphor of the present invention to produce an organic dispersion-type EL panel, it becomes possible to achieve adaptation to outdoor applications, for example.
【００３５】なお、上述した各実施例では、 ZnS:Cu,Br
型ＥＬ蛍光体を用いた例について説明したが、付活剤と
して銅やマンガン、共付活剤として塩素、臭素、よう
素、アルミニウム等を用いた各種硫化亜鉛蛍光体に対し
て本発明は有効である。In each of the above embodiments, ZnS: Cu, Br
Although an example using the type EL phosphor has been described, the present invention is effective for various zinc sulfide phosphors using copper or manganese as an activator and chlorine, bromine, iodine, aluminum, etc. as a coactivator. Is.
【００３６】[0036]
【発明の効果】以上説明したように、本発明の電場発光
蛍光体によれば、蛍光体粒子表面を適量の珪酸亜鉛で被
覆しているため、蛍光体の特性に悪影響を与えることな
く、耐紫外線性を大幅に向上させることができる。よっ
て、耐紫外線性に優れた長寿命のＥＬパネルの製造が可
能となり、ＥＬパネルの屋外用途等への適応に実用上大
きく貢献するものである。As described above, according to the electroluminescent phosphor of the present invention, since the surface of the phosphor particles is coated with an appropriate amount of zinc silicate, the characteristics of the phosphor are not adversely affected, and The ultraviolet property can be greatly improved. Therefore, it becomes possible to manufacture a long-life EL panel excellent in ultraviolet resistance, which greatly contributes to the practical application of the EL panel to outdoor applications.
【図１】 本発明のＥＬ蛍光体の紫外線照射後の反射率
を従来例と比較して示す図である。FIG. 1 is a diagram showing the reflectance of an EL phosphor of the present invention after being irradiated with ultraviolet rays in comparison with a conventional example.
Claims (1)
て銅およびマンガンから選ばれた少なくとも 1種と、共
付活剤として塩素、臭素、よう素およびアルミニウムか
ら選ばれた少なくとも 1種とを含有させた電場発光蛍光
体であって、その蛍光体粒子表面に、 0.1〜 2重量% の
珪酸亜鉛が被覆されていることを特徴とする電場発光蛍
光体。1. Zinc sulfide as a base material, and at least one selected from copper and manganese as an activator, and at least one selected from chlorine, bromine, iodine and aluminum as a co-activator. An electroluminescent phosphor, containing 0.1 to 2% by weight of zinc silicate, on the surface of the phosphor particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33531693A JPH07188651A (en) | 1993-12-28 | 1993-12-28 | Electroluminescent fluorescencer and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33531693A JPH07188651A (en) | 1993-12-28 | 1993-12-28 | Electroluminescent fluorescencer and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07188651A true JPH07188651A (en) | 1995-07-25 |
Family
ID=18287163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33531693A Withdrawn JPH07188651A (en) | 1993-12-28 | 1993-12-28 | Electroluminescent fluorescencer and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07188651A (en) |
-
1993
- 1993-12-28 JP JP33531693A patent/JPH07188651A/en not_active Withdrawn
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