US5612591A
Expired / Lapsed
US
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Electroluminescent device
Assignee: Denso Corp
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Filing: 1994-12-29
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Granted: 1997-03-18
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Expires: 2014-12-29
Abstract
Abstract An electroluminescent device comprising the sequential lamination of a first electrode, first insulating layer, phosphor layer, second insulating layer and second electrode while using an optically transparent material at least on the side on which light leaves the device; wherein, in addition to the phosphor layer being composed of calcium thiogallate (CaGa 2 S 4 ) doped with a luminescent center element, the host of the phosphor layer is strongly oriented to the (400) surface.
Inventors
- 👤 Masayuki Katayama
- 👤 Akira Kato
- 👤 Nobuei Ito
- 👤 Tadashi Hattori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:52
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7715; C09K11/7716; C09K11/7718; H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; Y; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
An electroluminescent device comprising: first electrode; first insulating layer on said first electrode; phosphor layer on said first insulating layer, wherein said phosphor layer comprises a calcium thiogallate host which is doped with a luminescent center element and which has an x-ray diffraction intensity ratio I(400)/I(422) greater than about four; second insulating layer, on said phosphor layer; and second electrode on said second insulating layer.
Claim 2
Dependent Claim
65 words
An electroluminescent device comprising: first electrode; first insulating layer on said first electrode; phosphor layer on said first insulating layer, wherein said phosphor layer comprises a calcium thiogallate host which is doped with a luminescent center element and which has an x-ray diffraction intensity ratio I(400)/I(422) greater than about four; second insulating layer, on said phosphor layer; and second electrode on said second insulating layer.
Claim 3
Dependent Claim
15 words
An electroluminescent device according to claim 1, wherein said luminescent center element is cerium (Ce).
Claim 4
Dependent Claim
78 words
An electroluminescent device comprising: a first electrode; first insulating layer on said first electrode; phosphor layer on said first insulating layer, wherein said phosphor layer comprises a calcium thiogallate host which is doped with a luminescent center element and which has an x-ray diffraction intensity ratio I(400)/I(422) greater than about four, and said phosphor layer is grown by metal organic chemical vapor deposition; second insulating layer on said phosphor layer; and second electrode on said second insulating layer.
Claim 5
Dependent Claim
78 words
An electroluminescent device comprising: a first electrode; first insulating layer on said first electrode; phosphor layer on said first insulating layer, wherein said phosphor layer comprises a calcium thiogallate host which is doped with a luminescent center element and which has an x-ray diffraction intensity ratio I(400)/I(422) greater than about four, and said phosphor layer is grown by metal organic chemical vapor deposition; second insulating layer on said phosphor layer; and second electrode on said second insulating layer.
Claim 6
Dependent Claim
114 words
An electroluminescent device comprising: a transparent substrate; first electrode on said transparent substrate; first insulating layer on said first electrode; a phosphor layer on said first insulating layer, wherein said phosphor layer comprises a calcium thiogallate host which is doped with a luminescent center element and which has an x-ray diffraction intensity ratio I(400)/I(422) greater than about four, and said phosphor layer is grown by metal organic chemical vapor deposition while said transparent substrate is heated to a temperature equal to or greater than a prescribed temperature so that said x-ray diffraction intensity ratio is greater than about four; second insulating layer on said phosphor layer; and second electrode on said second insulating layer.
Claim 7
Dependent Claim
114 words
An electroluminescent device comprising: a transparent substrate; first electrode on said transparent substrate; first insulating layer on said first electrode; a phosphor layer on said first insulating layer, wherein said phosphor layer comprises a calcium thiogallate host which is doped with a luminescent center element and which has an x-ray diffraction intensity ratio I(400)/I(422) greater than about four, and said phosphor layer is grown by metal organic chemical vapor deposition while said transparent substrate is heated to a temperature equal to or greater than a prescribed temperature so that said x-ray diffraction intensity ratio is greater than about four; second insulating layer on said phosphor layer; and second electrode on said second insulating layer.
Claim 8
Dependent Claim
15 words
An electroluminescent device according to claim 4, wherein said prescribed temperature is about 500° C.
References Cited (Backward Citations)
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