Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Reexamination Certificate
2006-10-31
2006-10-31
Dye, Rena (Department: 1774)
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
C313S506000, C428S690000, C428S917000
Reexamination Certificate
active
07129633
ABSTRACT:
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 Si3NxOyHzwhere 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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Fay Sharpe Fagan Minnich & McKee LLP
Ifire Technology Inc.
Thompson Camie S.
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