Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1988-12-23
1990-06-26
Seidleck, James
Stock material or miscellaneous articles
Composite
Of inorganic material
428691, 2523014R, 313506, C09K 1150
Patent
active
049371509
ABSTRACT:
An ultrafine grain fluorescent body comprises an ultrafine grain luminescent material containing an activator and having a surface carrying thereon a layer which is formed from a different material from the luminescent material, or which has different properties from those of the luminescent material. The layer forms a heterojunction or p-n junction defining a luminescent mechanism in an interface between the luminescent material and the layer. The heterojunction is formed if the layer is a film of oxide, nitride or any other different substance formed on the surface of the luminescent material, e.g. ZnS, having a grain size of several hundred to several thousand angstroms. Alternatively, the p-n junction is formed if the luminescent material is a p-type (or n-type) semiconductor, and if the layer is a film of an n-type (or p-type) a semiconductor formed on the surface thereof. The fluorescent body of this invention is useful for making an electroluminescent (EL) element having a high luminance, a high luminescent efficiency and a high resolution, and capable of being driven by a low voltage.
REFERENCES:
patent: 4486499 (1984-12-01), Morimoto
patent: 4661373 (1987-04-01), Kato et al.
patent: 4680231 (1987-07-01), Yamaura et al.
Research Development Corporation
Seidleck James
Stanley Electric Company, Ltd.
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