クエン酸ゲル法を用いて合成した近紫外線励起用赤色蛍光体La_2O_2S:Euの発光特性(<特集>発光型/非発光型ディスプレイ技術の進展)

概要

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White light emitting diodes (LEDs) are expected to be used as lighting of the next generation for, for example, headlights, back lighting of liquid crystal displays (LCDs), illuminations, and so on. However, red emitting phosphors used for white LEDs have lower luminance efficiency than other emitting color phosphors because of larger stokes shift. La_2O_2S:Eu is known as red emitting phosphor; it shows good luminescence under near-ultraviolet excitation. In this study, synthesis of La_2O_2S:Eu using the citric acid gel method has been investigated. The results show that the particle size can be controlled by changing pre-firing conditions.
2009-11-01