H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 33/02 (2006.01) H01L 49/02 (2006.01) H05B 33/10 (2006.01) H05B 33/22 (2006.01)
Patent
CA 2352589
The invention aims to solve the problem of prior art EL devices that undesirable defects form in dielectric layers, and especially the problems of EL devices having dielectric layers of lead-base dielectric material including a lowering, variation and change with time of the luminance of light emission, and thereby provide an EL device ensuring high display quality and a method for manufacturing the same at a low cost. Such objects are achieved by an EL device comprising at least an electrically insulating substrate (11) and a structure including an electrode layer (12), a dielectric layer (13, 14, 15), a light emitting layer (17) and a transparent electrode layer (19) stacked on the substrate (11), wherein the dielectric layer is a laminate including a first thick-film ceramic high-permittivity dielectric layer (13) whose composition contains at least lead, a second high-permittivity layer (14) whose composition contains at least lead, and a third high-permittivity layer (15) whose composition is free of at least lead.
Miwa Masashi
Nagano Katsuto
Shirakawa Yukihiko
Ifire Ip Corporation
Marks & Clerk
Tdk Corporation
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