High-Luminance Blue-Emitting BaAl₂S₄:Eu Thin-Film Electroluminescent Devices

Abstract

The high-luminance blue emitting electroluminescent (EL) devices which have been satisfied with the requirement for full color displays were obtained. BaAl 2 S 4 :Eu thin-film EL devices as the new blue emitting EL phosphor was prepared by the two targets pulse-electron-beam evaporation. The maximum luminance level was 65 cd/m 2 under the 50 Hz-pulse voltage. The EL spectrum had a blue emission band with a peak around 475 nm due to the 5d-4f transition for Eu 2+ ion. The Commission Internationale de l'Eclairage (CIE) color coordinates of BaAl 2 S 4 :Eu EL device were x =0.12 and y =0.10.