| 摘要 |
A novel structure is provided to improve the operating stability of thioaluminate based phosphors used in ac thick film dielectric electroluminescent displays. The novel structure comprises a rare earth activated alkaline earth thioaluminate phosphor thin film layer and a silicon oxynitride layer provided directly adjacent the top and/or bottom of the phosphor thin film layer, wherein said silicon oxynitride layer comprises a composition of Si<SUB>3</SUB>N<SUB>x</SUB>O<SUB>y</SUB>H<SUB>z </SUB>where 2<=x<=4, 0<y<=2 and 0<=z<=1. The invention is particularly applicable to phosphors used in electroluminescent displays that employ thick dielectric layers subject to high processing temperatures to form and activate the phosphor films.
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