Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Patent
1987-09-24
1989-08-15
Yusko, Donald J.
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
313509, 427 66, 2041921, H01J 170, C23C 1500
Patent
active
048578029
ABSTRACT:
A thin film EL element which comprises an insulating substrate, a transparent electrode, a first insulating layer, a light-emitting layer, a second insulating layer and a back side electrode, successively laid one upon another, at least one of the first and second insulating layers being composed of a material having a perovskite crystal structure, for example, a layer of SrTiO.sub.3, PbTiO.sub.3 or BaTiO.sub.3, particularly a SrTiO.sub.3. The material having the perovskite crystal structure has an increased (111) plane orientation such that the diffraction intensity ratio of (111) plane to (110) plane, I (111)/I (110), is more than 0.5. The material can be a single crystal, having (111) plane orientation. The material is deposited by sputtering, at substrate temperatures of not less than 200.degree. C. and up to the softening point of the insulating substrate, and at a pressure of not more than 1.times.10.sup.-2 Torr. The material has a high dielectric constant, a high dielectric strength and thus has a high reliability of element performance with a low driving voltage.
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Abe Yoshio
Fuyama Moriaki
Hashimoto Kenichi
Nakayama Takahiro
Onisawa Ken-ichi
Hitachi , Ltd.
Horabik Michael
Yusko Donald J.
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