Blue-Emitting BaAl_2S_4: Eu Thin-Film Electroiluminescent Devices Prepared by Two Targets Pulse Electron Beam Evaporation

摘要

BaAl_2S_4:Eu thin-film EL device using a new blue emitting EL phosphor was prepared by the two targets pulse- electron-beam evaporation. The maximum luminance level was 65cd/m~2 under the 50Hz pulse voltage. The EL spectrum had blue emission with a peak around 470nm due to the transition for Eu~2+ion. The CIE color coordinates of BaAl_2S_4:Eu EL device were x=0.12 and y=0.10. The performance of blue-emitting BaAl_2S_4:Eu EL devices is shown to be sufficient for commercial color EL display in color purity and luminance level.