Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1989-12-22
1993-04-06
Robinson, Ellis P.
Stock material or miscellaneous articles
Composite
Of inorganic material
428917, 428216, 428336, 428699, 428698, 428701, 313506, 313509, 20419222, 20419223, 427 66, B32B 514, C23C 1400, B05D 102
Patent
active
052002772
ABSTRACT:
An electroluminescent device including dielectric films each of which consists of first regions made of a material with a strong self-healing type dielectric breakdown characteristic, second regions made of a material with a strong propagating type dielectric breakdown characteristic, and mixed regions consisting of a mixture of these two materials, the first and second regions being arranged alternately in the film thickness direction with the mixed regions therebetween, the mixing ratio of these two materials in the mixed regions changing in such a manner that the ratio of one material gradually decreases from a region of this material toward the adjacent region of the other material, that is, the ratio of the other material increases. Thus, the changes in the mixing ratio of these two materials of the dielectric films in the film thickness direction are continuous and periodic. These dielectric films, with a high breakdown field strength, make it possible to obtain an electroluminescent device having a large drive voltage margin and providing a luminescence of high brightness.
REFERENCES:
patent: 4670355 (1987-06-01), Matsudaira
S. Kinoshita, et al, vol. J69-C, No. 4, p. 416 (1986).
H. Morisaki et al, vol. 5, No. 4 Jul./Aug. 1987 p. 1767.
Abe Yoshio
Hanazono Masanobu
Hashimoto Kenichi
Nakayama Takahiro
Onisawa Ken-ichi
Hitachi , Ltd.
Nold Charles R.
Robinson Ellis P.
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