Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Patent
1995-08-01
1997-10-14
Patel, Nimeshkumar
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
313502, 313506, 313509, H05B 3300
Patent
active
056775946
ABSTRACT:
An electroluminescent phosphor is sandwiched by a pair of insulating layers which are sandwiched by a pair of electrode layers to provide an AC TFEL device. The phosphor consists of a host material and an activator dopant that is preferably a rare earth. The host material is an alkaline earth sulfide, an alkaline earth selenide or an alkaline earth sulfide selenide that includes a Group 3A metal selected from aluminum, gallium and indium. The phosphor is preferably fabricated by first depositing a layer of the alkaline earth sulfide, alkaline earth selenide or alkaline earth sulfide selenide including the rare earth dopant therein, depositing thereon an overlayer selected from an alkaline earth thiogallate, an alkaline earth thioindate, an alkaline earth thioaluminate, an alkaline earth selenoaluminate, an alkaline earth selenoindate, or an alkaline earth selenogallate. The two layers are annealed at a temperature preferably between 750.degree. and 850.degree. C.
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Bowen Michael S.
Sun Sey-Shing
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