Barium thioaluminate phosphor materials with novel crystal structures

摘要

The present invention provides thioaluminate phosphor compounds BaAl₂S₄ and BaAl₄S₇ with novel crystal structures that have higher luminosity and improved color coordinates. The invention is also directed to rare earth element activated barium thioaluminate phosphor films comprising a phosphor compound having a novel crystal lattice structure that increases the electroluminescent light emission from the film. The phosphor films are for use in electroluminescent displays and in particular, thick film dielectric electroluminescent displays.