Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Patent
1996-10-31
1999-04-06
Patel, Nimeshkumar
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
313502, 313503, 313506, 313507, H01J 162, H05B 3300, H05B 3314
Patent
active
058923330
ABSTRACT:
A luminescent layer in an EL device composed of CaGa.sub.2 S.sub.4 :Ce includes a first luminescent layer and a second luminescent layer. The first luminescent layer has an atomic ratio of Ga to Ca being higher than that in the second luminescent layer, and directly disposed on a first insulating layer, whereby delamination can be prevented. The atomic ratio of Ga to Ca in the second luminescent layer is approximately equal to a stoichiometric ratio, so that the threshold voltage of the EL device can be kept low.
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SID 95 Digest pp. 728-731, 32.5/Smith, 32.5: Late-News Paper: Crystalline-as-Deposited CaGa2S4:Ce via Low-Temperature Metal-Organic Chemical Vapor Deposition, D.C. Smith et al.
Hattori Tadashi
Ito Nobuei
Katayama Masayuki
Mizutani Atsushi
Denso Corporation
Haynes Mack
Patel Nimeshkumar
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