Journal of Applied Physics (2004)

Blue electroluminescence from multilayered BaS:Eu/Al2S3 thin films
Philippe F. Smet, Dirk Poelman, Roland Vanmeirhaeghe
Journal of Applied Physics 95 (2004) 184-190

Abstract
Electroluminescent (EL) BaAl2S4:Eu devices were prepared with a multilayered phosphor, composed of 10?20 alternating BaS:Eu and Al2S3 thin films and a total phosphor thickness of 300 nm. Depending on evaporation and annealing conditions, pure blue EL was obtained (CIE 1931 color coordinates x=0.120, y=0.098). The use of this multilayered BaS:Eu/Al2S3 structure gave access to additional information on the atomic composition and luminescent properties of europium-doped barium thioaluminates. The composition of the phosphor layer (diffusion properties, oxygen impurities) was characterized using x-ray photoelectron spectroscopy as a function of substrate temperature and annealing parameters. Optical and morphological properties of BaS(:Eu) and Al2S3 thin films are discussed as well.

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