JP4024892B2 - Luminescent light emitting device - Google Patents
Luminescent light emitting device Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
本発明は、表示素子又は光源として点灯中に、何らかの原因で発光ダイオードが突然その発光を停止した場合でも、表示素子又は光源として発光を持続することができ、屋内や屋外、さらには水中などにおける表示又は光源用として利用できる蓄光性発光素子に関する。
【０００２】
【従来の技術】
従来、発光ダイオードは緑色ないし赤色を呈し、これを単体で又は複数個並べて１つの画素として組み合わせて光源やカラーディスプレイとして利用されており、近年、高効率の青色発光ダイオードが開発されるに至り、発光ダイオードを用いた大型のフルカラーディスプレイも実現している。
【０００３】
ところで、これらの発光ダイオードを用いた光源やディスプレイにあっては、例えば、停電等による不慮の電源停止等のトラブルがあった場合、直ちにその発光が停止するため、当然のことながら、光源やディスプレイとしての機能が停止して支障を来すことが多い。そこで、発光素子としては点灯中、突然発光が停止しても、直ちには光源やディスプレイとしての機能が停止しないような蓄光性発光素子が求められている。
【０００４】
【発明が解決しようとする課題】
そこで、本発明は、光源やディスプレイに適した発光素子であって、発光ダイオードを有する発光素子が何かの原因で発光停止した場合でも、光源やディスプレイとしての機能を持続させることができる蓄光性発光素子を提供しようとするものである。
【０００５】
【課題を解決するための手段】
本発明者は、上記課題を解決するために鋭意検討した結果、ある種の蛍光体は従来の発光ダイオードの発する発光光によって励起されて自らが発光し、励起源である発光ダイオードの発光が停止した後も、自らの発光を持続させることが可能な蛍光体（いわゆる、蓄光性蛍光体）が存在し、これらの蓄光性蛍光体と発光ダイオードとを組み合わせることによって上記課題が解消できることを見出し、本発明を完成させるに至った。即ち、本発明の構成は下記のとおりである。
【０００６】
(1) 近紫外域ないし可視光域に発光する発光ダイオードと、該発光ダイオードの発光光で励起されて瞬時発光し得る蓄光性蛍光体とを組み合わせた蓄光性発光素子であって、前記発光ダイオードの上に銅（Ｃｕ）付活硫化亜鉛系蛍光体、ユーロピウム（Ｅｕ）付活アルカリ土類硫化物系蛍光体、ユーロピウム（Ｅｕ）付活アルカリ土類アルミン酸塩系蛍光体、及び、ユーロピウム（Ｅｕ）付活アルカリ土類珪酸塩蛍光体の群から選択される１種以上の蓄光性蛍光体が塗布されてなり、該発光ダイオードの発光が停止した後も、自らの発光を持続させることが可能なことを特徴とする蓄光性発光素子。
【０００７】
(2) 前記発光ダイオード上にキャップを備えたことを特徴とする上記(1)に記載の蓄光性発光素子。
【０００８】
(3) 前記キャップが樹脂モールドであることを特徴とする上記(2)に記載の蓄光性発光素子。
(4) 前記キャップが半球状であることを特徴とする上記(2)又は(3)に記載の蓄光性発光素子。
【０００９】
(5) 前記発光ダイオードの発光ピーク波長が５００ｎｍ以下であることを特徴とする上記(1)〜(4)のいずれかに記載の蓄光性発光素子。
(6)前記蓄光性蛍光体が同一種の蛍光体又は２種以上の混合蛍光体であることを特徴とする上記(1)〜(5)のいずれかに記載の蓄光性発光素子。
【００１０】
(7)前記発光ダイオードが（Ｇａ1-x-yＡｌxＩｎy）Ｎ（但し、ｘ及びｙはそれぞれ０≦ｘ≦１、及び、０≦ｙ≦１なる条件を満たす数である）、ＳｉＣ、ＢＮ及びＺｎ（Ｓ，Ｓｅ）の群から選択される１種以上のものであることを特徴とする上記１〜(6)のいずれか一項に記載の蓄光性発光素子。
【００１１】
【発明の実施の形態】
本発明は、近紫外域ないし可視光域に発光する発光ダイオードと、発光ダイオードの発光光で励起されて瞬時発光し得る蓄光性蛍光体とを組み合わせたことにより、発光ダイオードの発光を停止しても依然として青色〜赤色の発光を持続する蓄光性発光素子の提供を可能にした。
【００１２】
本発明の蓄光性発光素子に用いる発光ダイオードは、発光ピーク波長が４００〜５００ｎｍの範囲にあるものが好ましい。一般に５００ｎｍより長い波長領域には蛍光体の励起帯が存在しないので、そのような波長領域に発光ダイオードの発光ピーク波長が有っても蛍光体の瞬時発光に寄与せず、また、４００ｎｍより短い波長領域で発光する発光ダイオードは製造が難しいためである。
【００１３】
本発明の蓄光性発光素子に用いる青色発光蛍光体は、組成式が（Ｃａ1-m Ｍｇm ）Ｏ・ｒ（Ａｌ1-n Ｂn ）2 Ｏ3 ：Ｅｕ，Ｎｄ（但し、ｍ、ｎ及びｒはそれぞれ０≦ｍ≦０．２、０≦ｎ≦０．２及び０．７≦ｒ≦２．０の範囲である）で表されるユーロピウム付活アルカリ土類アルミン酸塩系蛍光体、組成式がｍＣａＯ・ｎＭｇＯ・２ＳｉＯ2 ：Ｅｕ，Ｄｙ，Ｘ（但し、ＸはＦ、Ｃｌ、Ｂｒ及びＩの群から選択される１種以上のハロゲン元素であり、ｍ及びｎはそれぞれ、１．５≦ｍ≦３．５及び０．５≦ｎ≦１．５である）で表されるユーロピウム付活アルカリ土類珪酸塩系蛍光体、組成式がｍＣａＯ・ｎＭｇＯ・２ＳｉＯ2 ：Ｅｕ，Ｎｄ，Ｘ（但し、ＸはＦ、Ｃｌ、Ｂｒ及びＩの群から選択される１種以上のハロゲン元素であり、ｍ及びｎはそれぞれ１．５≦ｍ≦３．５、０．５≦ｎ≦１．５である）で表されるユーロピウム付活アルカリ土類珪酸塩系蛍光体等などを挙げることができる。
【００１４】
本発明の蓄光性発光素子に用いる緑色発光蛍光体は、組成式が（Ｓｒ1-m Ｍｇm ）Ｏ・ｒ（Ａｌ1-n Ｂn ）2 Ｏ3 ：Ｅｕ，Ｄｙ（但し、ｍ、ｎ及びｒはそれぞれ０≦ｍ≦０．２、０≦ｎ≦０．２、０．７≦ｒ≦２．０である）で表されるユーロピウム付活アルカリ土類アルミン酸塩系蛍光体、組成式がｍＳｒＯ・ｎＭｇＯ・２ＳｉＯ2 ：Ｅｕ，Ｄｙ，Ｘ（但し、ＸはＦ、Ｃｌ、Ｂｒ及びＩの群から選択される１種以上のハロゲン元素であり、ｍ及びｎは、１．５≦ｍ≦３．５及び０．５≦ｎ≦１．５）で表されるユーロピウム付活アルカリ土類珪酸塩系蛍光体、組成式がｍＳｒＯ・ｎＭｇＯ・２ＳｉＯ2 ：Ｅｕ，Ｎｄ，Ｘ（但し、ＸはＦ、Ｃｌ、Ｂｒ及びＩの群から選択される１種以上のハロゲン元素であり、ｍ及びｎはそれぞれ１．５≦ｍ≦３．５及び０．５≦ｎ≦１．５である）で表されるユーロピウム付活アルカリ土類珪酸塩系蛍光体、組成式がＺｎＳ：Ｃｕ，Ｃｌで表される銅（Ｃｕ）付活硫化亜鉛蛍光体などを挙げることができる。
【００１５】
本発明の蓄光性発光素子に用いる橙色〜赤色発光蛍光体は、組成式がＣａＳ：Ｅｕで表されるユーロピウム付活硫化カルシウム蛍光体などを挙げることができる。
そして、得られる蓄光性発光素子の所望の発光色に対応して、上記蓄光性蛍光体の中の１種又は２種以上の蛍光体を適宜選択して発光ダイオードと組み合わせて用いることができる。
【００１６】
本発明の蓄光性発光素子に用い発光ダイオードは、同時に用いられる蓄光性蛍光体を励起して、その蛍光体を効率良く瞬時に発光させることができるものが適している。具体的には、（Ｇａ1-x-y Ａｌx,Ｉｎy ）Ｎ（但し、ｘ及びｙはそれぞれ０≦ｘ≦１、及び、０≦ｙ≦１なる条件を満たす数である）、ＳｉＣ、ＢＮ及びＺｎ（Ｓ, Ｓｅ）の群から選択される１種以上のものであって、その発光スペクトルのピーク波長が、４００〜５００ｎｍである発光ダイオードが適している。
【００１７】
図１は、本発明の蓄光性発光素子の構造の一例を示す断面模式図である。フレーム３の上に発光ダイオードチップを載せ、その上に蓄光性蛍光体を塗布し、電極端子５を引き出した状態で樹脂モールドでキャップを形成して素子とする。
【００１８】
本発明の蓄光性発光素子の製造には、予め所定量秤取した上記蓄光蛍光体の少なくとも一種を、アセトンやトルエン等有機溶剤及び脱イオン水等に希釈したアクリル樹脂、エポキシ樹脂及びポリイミド樹脂等の透明な樹脂と混合し、この混合物を注射器のような細いノズルから発光ダイオードの発光チップ上に容積にして数十μｌ滴下して塗布する（特公昭５２−４０９５９号公報参照）。なお、上記有機溶剤の代わりに水溶性樹脂やアルカリ珪酸塩を用いることも可能である。
【００１９】
上記蛍光体が塗布された発光ダイオードのチップを乾燥した後、エポキシ樹脂等の透明な樹脂やガラス等のキャップを前記チップの上に取り付けて蓄光性発光素子を得る。
【００２０】
このようにして得た発光素子は、最大５Ｖで、最大３０ｍＡまでの定格直流負荷を数分間加えてしばらく発光させた後、負荷電流を遮断した時、発光ダイオードチップ上の蓄光性蛍光体はその固有の発光を持続した。
【００２１】
【実施例】
〔実施例１〕
エポキシ樹脂（日東電工社製ＮＴ８０１４） １ｇｒ
酸無水物系硬化剤 １０ｇｒ
青色発光蛍光体 ２ｍｇ
（Ｓｒ1.995 ＭｇＳｉ2 Ｏ7 ：Ｅｕ0.005 ，Ｄｙ0.025 ，Ｃｌ0.025 ）
【００２２】
上記の蛍光体と樹脂との混合物を調製し、注射器を用いて４５０ｎｍに発光ピークを有するＧａＮ青色発光ダイオードのチップ上に５０μｌ滴下して乾燥した後、その上に半球状の透明なエポキシ樹脂キャップを設けて蓄光性発光素子とした。
得られた蓄光性発光素子に５Ｖ、３０ｍＡの電流を３０分間印加して点灯させた後、電流を遮断した後の残光特性を調べたところ、図２の曲線（ａ）に示すとおりであった。なお、その際の残光の発光スペクトルは図３の曲線（ａ）であった。
【００２３】
〔実施例２〕
アクリル樹脂 １ｇｒ
（日本カーバイト工業社製、ニッカゾール、固形分５０％）
脱イオン水 ５ｇｒ
緑色発光蛍光体 １ｍｇ
（Ｓｒ0.994 Ｍｇ0.005 Ａｌ2.196 Ｂ0.004 Ｏ4 ：Ｅｕ0.001Ｄｙ0.005 ）
【００２４】
上記の蛍光体と樹脂との混合物を調製し、注射器を用いて４５０ｎｍに発光ピークを有するＧａＮ青色発光ダイオードのチップ上に５０μｌ滴下して乾燥した後、その上に半球状の透明なアクリル樹脂キャップを設けて蓄光性発光素子とした。
得られた蓄光性発光素子に５Ｖ、３０ｍＡの電流を３０分間印加して点灯させた後、電流を遮断した後の残光特性を調べたところ、図２の曲線（ｂ）に示すとおりであった。なお、その際の残光の発光スペクトルは図３の曲線（ｂ）であった。
【００２５】
〔実施例３〕
水ガラス（東京応化社製、オーカシールＡ） １ｇｒ
酢酸バリウム １０ｇｒ
赤色発光蛍光体（ＣａＳ：Ｅｕ） １ｍｇ
【００２６】
上記の蛍光体と水ガラスとの混合物を調製し、注射器を用いて４５０ｎｍに発光ピークを有するＧａＮ青色発光ダイオードのチップ上に５０μｌ滴下して乾燥した後、その上に半球状の透明なエポキシ樹脂キャップを設けて蓄光性発光素子とした。
得られた蓄光性発光素子に５Ｖ、３０ｍＡの電流を３０分間印加して点灯させた後、電流を遮断した後の残光特性を調べたところ、図２の曲線（ｄ）に示すとおりであった。なお、その際の残光の発光スペクトルは図３の曲線（ｄ）であった。
【００２７】
〔実施例４〕
青色発光蛍光体（Ｓｒ1.995 ＭｇＳｉ2 Ｏ7 ：Ｅｕ0.005,Ｄｙ0.025,Ｃｌ0.025 ）に代えて、緑色発光蛍光体（ＺｎＳ：Ｃｕ，Ｃｌ）を用いた以外は実施例１と同様にして蓄光性発光素子を得た。
得られた発光素子について、実施例１と同様にしてその残光特性及び残光の発光スペクトルを調べたところ、それぞれ図２の曲線（ｃ）及び図３の曲線（ｃ）に示すとおりであった。
【００２８】
【発明の効果】
本発明は、上記の構成を採用することにより、従来不可能であった発光素子の励起源が停止した後にも、長時間視認可能な所望の発光色で発光を持続することができ、表示の多色化多様化、電力節減等に大きく寄与し、かつ、光源やディスプレイの用途を広げるのに大きく寄与するものである。
【図面の簡単な説明】
【図１】本発明の蓄光性発光素子の概略構造を示した断面図である。
【図２】実施例１〜４で作製した蓄光性発光素子の残光特性を示したグラフである。
【図３】実施例１〜４で作製した蓄光性発光素子の、励起源を停止した後の発光スペクトルを示したグラフである。[0001]
BACKGROUND OF THE INVENTION
Even when the light emitting diode suddenly stops emitting light for some reason during lighting as a display element or light source, the present invention can continue to emit light as a display element or light source, indoors or outdoors, and even in water The present invention relates to a luminous light-emitting element that can be used for display or a light source.
[0002]
[Prior art]
Conventionally, light emitting diodes have a green or red color, and are used as a light source or a color display by combining a single pixel or a plurality of them as one pixel, and in recent years, highly efficient blue light emitting diodes have been developed. A large full-color display using light-emitting diodes has also been realized.
[0003]
By the way, in the light source and display using these light emitting diodes, for example, when there is a trouble such as an unexpected power stop due to a power failure or the like, the light emission is stopped immediately. As the function stops, it often causes trouble. Thus, there is a need for a luminous light emitting element that does not immediately stop functioning as a light source or a display even if light emission suddenly stops during lighting.
[0004]
[Problems to be solved by the invention]
Therefore, the present invention is a light-emitting element suitable for a light source or a display, and even if the light-emitting element having the light-emitting diode stops emitting light for some reason, the light-storing property that can maintain the function as the light source or the display A light-emitting element is to be provided.
[0005]
[Means for Solving the Problems]
As a result of intensive studies to solve the above-mentioned problems, the present inventor has excited certain types of phosphors by being emitted by light emitted from a conventional light emitting diode to emit light, and stops light emission from the light emitting diode as an excitation source. After that, there is a phosphor (so-called phosphorescent phosphor) capable of sustaining its own light emission, and it is found that the above problem can be solved by combining these phosphorescent phosphors and a light emitting diode, The present invention has been completed. That is, the configuration of the present invention is as follows.
[0006]
(1) a light emitting diode and, phosphorescent light emitting device that combines a phosphorescent phosphors can be instantaneously emits light when excited by the light emitted of the light emitting diodes emitting in the near ultraviolet region to visible light region, the light emitting diode Copper (Cu) activated zinc sulfide phosphor, europium (Eu) activated alkaline earth sulfide phosphor, europium (Eu) activated alkaline earth aluminate phosphor, and europium ( eu) 1 or more phosphorescent phosphors being selected from the group of activated alkaline-earth silicate phosphor is being applied, even after the emission of the light emitting diode is stopped and to sustain their light emitting A phosphorescent light emitting device characterized by being capable of being used.
[0007]
( 2 ) The luminous light-emitting device according to (1) above, wherein a cap is provided on the light-emitting diode.
[0008]
( 3 ) The luminous light-emitting device according to ( 2 ), wherein the cap is a resin mold.
( 4 ) The luminous light-emitting device according to ( 2 ) or ( 3 ) above, wherein the cap is hemispherical.
[0009]
( 5 ) The luminous light-emitting device according to any one of (1) to ( 4 ), wherein an emission peak wavelength of the light-emitting diode is 500 nm or less.
( 6 ) The phosphorescent light-emitting device according to any one of the above (1) to ( 5 ), wherein the phosphorescent phosphor is the same type of phosphor or a mixture of two or more phosphors.
[0010]
( 7 ) The light emitting diode is (Ga 1 -xy Al x In y ) N (where x and y are numbers satisfying the conditions of 0 ≦ x ≦ 1 and 0 ≦ y ≦ 1), SiC, The luminous light-emitting device according to any one of 1 to 6 above, which is one or more selected from the group consisting of BN and Zn (S, Se).
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The present invention stops light emission of a light emitting diode by combining a light emitting diode that emits light in the near ultraviolet region or visible light region with a phosphorescent phosphor that is excited by light emitted from the light emitting diode and can emit light instantaneously. However, it has become possible to provide a phosphorescent light-emitting element that can continue to emit blue to red light.
[0012]
The light emitting diode used in the phosphorescent light emitting device of the present invention preferably has an emission peak wavelength in the range of 400 to 500 nm. In general, since there is no phosphor excitation band in a wavelength region longer than 500 nm, even if the emission peak wavelength of the light emitting diode exists in such a wavelength region, it does not contribute to the instantaneous light emission of the phosphor, and is shorter than 400 nm. This is because light-emitting diodes that emit light in the wavelength region are difficult to manufacture.
[0013]
The blue light-emitting phosphor used in the phosphorescent light-emitting device of the present invention has a composition formula of (Ca 1-m Mg m ) O · r (Al 1-n B n ) 2 O 3 : Eu, Nd (where m, n And r are ranges of 0 ≦ m ≦ 0.2, 0 ≦ n ≦ 0.2, and 0.7 ≦ r ≦ 2.0), respectively. , MCaO · nMgO · 2SiO 2 : Eu, Dy, X (where X is one or more halogen elements selected from the group of F, Cl, Br and I, and m and n are each 1 Europium-activated alkaline earth silicate phosphors represented by the following formula: mCaO · nMgO · 2SiO 2 : Eu, Nd , X (where X is one or more halogen elements selected from the group consisting of F, Cl, Br and I, and m and n Are 1.5 ≦ m ≦ 3.5 and 0.5 ≦ n ≦ 1.5), respectively, and europium-activated alkaline earth silicate phosphors.
[0014]
The green light-emitting phosphor used in the phosphorescent light-emitting device of the present invention has a composition formula of (Sr 1-m Mg m ) O · r (Al 1-n B n ) 2 O 3 : Eu, Dy (where m, n And r are 0 ≦ m ≦ 0.2, 0 ≦ n ≦ 0.2, 0.7 ≦ r ≦ 2.0), and europium-activated alkaline earth aluminate-based phosphor, composition Formula is mSrO · nMgO · 2SiO 2 : Eu, Dy, X (where X is one or more halogen elements selected from the group of F, Cl, Br and I, and m and n are 1.5 ≦ Europium-activated alkaline earth silicate phosphors represented by m ≦ 3.5 and 0.5 ≦ n ≦ 1.5), the composition formula is mSrO · nMgO · 2SiO 2 : Eu, Nd, X (provided that X is one or more halogen elements selected from the group of F, Cl, Br and I, and m and n are each 1.5 ≦ m ≦ 3.5 and 0.5 ≦ n ≦ 1.5), a europium-activated alkaline earth silicate phosphor, and a copper (Cu) -activated composition represented by ZnS: Cu, Cl Examples thereof include zinc sulfide phosphors.
[0015]
Examples of the orange to red light emitting phosphor used in the phosphorescent light emitting device of the present invention include a europium activated calcium sulfide phosphor whose composition formula is represented by CaS: Eu.
And according to the desired luminescent color of the obtained luminous phosphor, one or more phosphors among the phosphorescent phosphors can be appropriately selected and used in combination with the light emitting diode.
[0016]
As the light-emitting diode used in the phosphorescent light-emitting device of the present invention, a light-emitting diode that excites a phosphorescent phosphor that is used at the same time and can efficiently and instantaneously emit the phosphor is suitable. Specifically, (Ga 1 -xy Al x, In y ) N (where x and y are numbers satisfying the conditions of 0 ≦ x ≦ 1 and 0 ≦ y ≦ 1), SiC, BN And one or more selected from the group of Zn (S, Se), and a light emitting diode whose emission spectrum has a peak wavelength of 400 to 500 nm is suitable.
[0017]
FIG. 1 is a schematic cross-sectional view showing an example of the structure of the luminous light-emitting element of the present invention. A light-emitting diode chip is mounted on the frame 3, a phosphorescent phosphor is applied thereon, and a cap is formed with a resin mold in a state where the electrode terminal 5 is pulled out to form an element.
[0018]
For the production of the phosphorescent light emitting device of the present invention, an acrylic resin, an epoxy resin, a polyimide resin, or the like obtained by diluting at least one of the phosphorescent phosphors weighed in advance in an organic solvent such as acetone or toluene and deionized water, etc. The resin is mixed with a transparent resin, and the mixture is applied in a volume of several tens of μl onto a light emitting chip of a light emitting diode from a thin nozzle such as a syringe (see Japanese Examined Patent Publication No. Sho 52-40959). In addition, it is also possible to use water-soluble resin and alkali silicate instead of the said organic solvent.
[0019]
After the light emitting diode chip coated with the phosphor is dried, a transparent resin such as epoxy resin or a cap such as glass is attached on the chip to obtain a luminous light emitting element.
[0020]
The light emitting device thus obtained has a maximum voltage of 5 V, a rated direct current load of up to 30 mA is applied for several minutes, light is emitted for a while, and when the load current is cut off, the phosphorescent phosphor on the light emitting diode chip is Sustained inherent luminescence.
[0021]
【Example】
[Example 1]
Epoxy resin (NT8014 manufactured by Nitto Denko Corporation) 1 gr
10g of acid anhydride curing agent
Blue light emitting phosphor 2mg
(Sr 1.995 MgSi 2 O 7 : Eu 0.005 , Dy 0.025 , Cl 0.025 )
[0022]
Prepare a mixture of the above phosphor and resin, drop 50 μl onto a GaN blue light-emitting diode chip having an emission peak at 450 nm using a syringe, dry it, and then hemispherical transparent epoxy resin cap on it To provide a luminous light emitting element.
The obtained phosphorescent light emitting element was lit by applying a current of 5 V and 30 mA for 30 minutes, and then the afterglow characteristics after the current was cut off were as shown in the curve (a) of FIG. It was. In addition, the afterglow emission spectrum in that case was the curve (a) of FIG.
[0023]
[Example 2]
Acrylic resin 1gr
(Nippon Carbite Industries, Nikkasol,
Deionized water 5gr
Green light emitting phosphor 1mg
(Sr 0.994 Mg 0.005 Al 2.196 B 0.004 O 4 : Eu 0.001 Dy 0.005 )
[0024]
A mixture of the above phosphor and resin is prepared, 50 μl is dropped onto a chip of a GaN blue light emitting diode having an emission peak at 450 nm using a syringe and dried, and then a hemispherical transparent acrylic resin cap is formed thereon To provide a luminous light emitting element.
The obtained phosphorescent light-emitting element was lighted by applying a current of 5 V and 30 mA for 30 minutes, and afterglow characteristics after the current was cut off were as shown in curve (b) of FIG. It was. The afterglow emission spectrum at that time was the curve (b) in FIG.
[0025]
Example 3
1 glass of water glass (Okaseal A, manufactured by Tokyo Ohkasha)
Barium acetate 10gr
Red light emitting phosphor (CaS: Eu) 1mg
[0026]
A mixture of the above phosphor and water glass was prepared, and 50 μl was dropped onto a chip of a GaN blue light emitting diode having an emission peak at 450 nm using a syringe and dried, and then a hemispherical transparent epoxy resin was formed thereon. A cap was provided to obtain a luminous light emitting element.
The obtained phosphorescent light-emitting element was lighted by applying a current of 5 V and 30 mA for 30 minutes, and afterglow characteristics after the current was cut off were as shown in curve (d) of FIG. It was. The afterglow emission spectrum at that time was the curve (d) in FIG.
[0027]
Example 4
Luminescent properties in the same manner as in Example 1 except that a green light emitting phosphor (ZnS: Cu, Cl) was used instead of the blue light emitting phosphor (Sr 1.995 MgSi 2 O 7 : Eu 0.005, Dy 0.025, Cl 0.025 ). A light emitting device was obtained.
When the afterglow characteristics and the afterglow emission spectrum of the obtained light emitting device were examined in the same manner as in Example 1, they were as shown by the curve (c) in FIG. 2 and the curve (c) in FIG. 3, respectively. It was.
[0028]
【The invention's effect】
By adopting the above configuration, the present invention can maintain light emission in a desired luminescent color that can be viewed for a long time even after the excitation source of the light emitting element, which has been impossible in the past, is stopped. This greatly contributes to diversification and diversification, power saving, and the like, and also greatly contributes to expanding applications of light sources and displays.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a schematic structure of a luminous light emitting device of the present invention.
FIG. 2 is a graph showing afterglow characteristics of the phosphorescent light-emitting elements produced in Examples 1 to 4.
FIG. 3 is a graph showing an emission spectrum of the phosphorescent light emitting device produced in Examples 1 to 4 after the excitation source is stopped.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34348096A JP4024892B2 (en) | 1996-12-24 | 1996-12-24 | Luminescent light emitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34348096A JP4024892B2 (en) | 1996-12-24 | 1996-12-24 | Luminescent light emitting device |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2006312458A Division JP2007053408A (en) | 2006-11-20 | 2006-11-20 | Accumulating light-emitting device |
| JP2007121880A Division JP2007304588A (en) | 2007-05-02 | 2007-05-02 | Display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10188649A JPH10188649A (en) | 1998-07-21 |
| JP4024892B2 true JP4024892B2 (en) | 2007-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34348096A Expired - Fee Related JP4024892B2 (en) | 1996-12-24 | 1996-12-24 | Luminescent light emitting device |
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| JP (1) | JP4024892B2 (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3937644B2 (en) * | 1999-03-25 | 2007-06-27 | セイコーエプソン株式会社 | Light source, lighting device, and liquid crystal device using the lighting device |
| DE19918370B4 (en) | 1999-04-22 | 2006-06-08 | Osram Opto Semiconductors Gmbh | LED white light source with lens |
| JP2000347601A (en) * | 1999-06-02 | 2000-12-15 | Toshiba Electronic Engineering Corp | Light emitting device |
| JP3656715B2 (en) * | 1999-07-23 | 2005-06-08 | 松下電工株式会社 | Light source device |
| US6686691B1 (en) * | 1999-09-27 | 2004-02-03 | Lumileds Lighting, U.S., Llc | Tri-color, white light LED lamps |
| AT410266B (en) | 2000-12-28 | 2003-03-25 | Tridonic Optoelectronics Gmbh | LIGHT SOURCE WITH A LIGHT-EMITTING ELEMENT |
| JP4125878B2 (en) * | 2001-08-27 | 2008-07-30 | 東芝電子エンジニアリング株式会社 | Light emitting device |
| JP2003306674A (en) | 2002-04-15 | 2003-10-31 | Sumitomo Chem Co Ltd | Fluorescent material for white led, and white led using the same |
| JP4691955B2 (en) * | 2003-10-28 | 2011-06-01 | 日亜化学工業株式会社 | Fluorescent substance and light emitting device |
| US7488432B2 (en) | 2003-10-28 | 2009-02-10 | Nichia Corporation | Fluorescent material and light-emitting device |
| US7497973B2 (en) * | 2005-02-02 | 2009-03-03 | Lumination Llc | Red line emitting phosphor materials for use in LED applications |
| DE602006018002D1 (en) * | 2005-05-30 | 2010-12-16 | Nemoto Tokushu Kagaku Kk | GREEN LIGHT EMITTING FLUOR |
| JP3863169B2 (en) * | 2005-10-03 | 2006-12-27 | 東芝電子エンジニアリング株式会社 | Light emitting device |
| JP3863174B2 (en) * | 2006-05-08 | 2006-12-27 | 東芝電子エンジニアリング株式会社 | Light emitting device |
| US20080023715A1 (en) * | 2006-07-28 | 2008-01-31 | Choi Hoi Wai | Method of Making White Light LEDs and Continuously Color Tunable LEDs |
| JP2007053408A (en) * | 2006-11-20 | 2007-03-01 | Kasei Optonix Co Ltd | Accumulating light-emitting device |
| JP2008311670A (en) * | 2008-07-18 | 2008-12-25 | Lite-On Technology Corp | White light emitting diode |
| EP3088488B1 (en) * | 2014-03-11 | 2017-08-23 | Nemoto Lumi-materials Company, Limited | Phosphorescent phosphor |
| JP6292684B1 (en) * | 2016-12-28 | 2018-03-14 | 国立研究開発法人産業技術総合研究所 | Luminescent phosphor and method for producing the same |
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1996
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| JPH10188649A (en) | 1998-07-21 |
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