Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Patent
1982-01-28
1984-08-07
Demeo, Palmer
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
H05B 3312
Patent
active
044646020
ABSTRACT:
The structure of a thin film electroluminescent device wherein an insulating layer (Y.sub.2 O.sub.3) is disposed between a pair of outer active layers of doped semiconductor (ZnS:Mn). Contiguous to one outer layer of ZnS:Mn is a metal electrode while a transparent electrode is contiguous to the other outer ZnS:Mn layer. The composite structure, moreover, is formed on and supported by a glass substrate. Electroluminescent phenomenon occurs primarily at the layer interfaces upon the application of an alternating voltage applied across electrodes. Such a structure is more resistant to failure due to the fact that the ZnS:Mn layers next to the electrodes act as current limiting layers for preventing breakdown and destruction of the metal electrode for a certain applied voltage which would otherwise occur in electroluminescent structures having the active ZnS:Mn layer sandwiched between two insulating layers.
REFERENCES:
patent: 2824992 (1958-02-01), Bouchard et al.
patent: 2924732 (1960-02-01), Lehmann
patent: 3388277 (1968-06-01), Thornton, Jr.
patent: 4326007 (1982-04-01), Williams et al.
Topics in Applied Physics, vol. 17, 1977, J. I. Pankove, Ed., Chapter 6 etled, "Phosphor Films", by T. Inoguchi and S. Mito at pp. 199 and 200 discloses a triple layer structure of a thin film electroluminescent device wherein the intermediate active layer is ZnS:Mn and outer insulating layers could be Y.sub.2 O.sub.3.
Demeo Palmer
Lane Anthony T.
Murray Jeremiah G.
Redman John W.
The United States of America as represented by the Secretary of
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