US4727003A
Expired / Lapsed
US
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Electroluminescence device
Assignee: Ricoh Co Ltd
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Filing: 1986-09-25
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Granted: 1988-02-23
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Expires: 2006-09-25
Abstract
Abstract An electroluminescence device capable of emitting white light is disclosed which comprises a SrS layer with Ce added thereto as an activator and a ZnS layer with Mn added thereto as an activator.
Inventors
- 👤 Seiichi Ohseto
- 👤 Hiroshi Kobayashi
- 👤 Shosaku Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:54
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145; H05B33/22; Y; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
An electroluminescence device comprising a substrate, an electrode formed on said substrate, an electroluminescence multi-layer comprising at least (1) a ZnS:Mn luminescence layer comprising ZnS and Mn which serves as an activator and (2) a SrS:Ce luminescence layer comprising SrS and Ce which serves as an activator, which luminescence multi-layer is disposed on said electrode, a back electrode disposed on said luminescence multi-layer, and at least one insulating layer interposed between one of said two electrodes and said luminescence multi-layer.
Claim 2
Dependent Claim
80 words
An electroluminescence device comprising a substrate, an electrode formed on said substrate, an electroluminescence multi-layer comprising at least (1) a ZnS:Mn luminescence layer comprising ZnS and Mn which serves as an activator and (2) a SrS:Ce luminescence layer comprising SrS and Ce which serves as an activator, which luminescence multi-layer is disposed on said electrode, a back electrode disposed on said luminescence multi-layer, and at least one insulating layer interposed between one of said two electrodes and said luminescence multi-layer.
Claim 3
Dependent Claim
27 words
The electroluminescence device as claimed in claim 1, wherein said substrate is made of a material selected from the group consisting of heat resistant glass and ceramics.
Claim 4
Dependent Claim
25 words
The electroluminescence device as claimed in claim 1, wherein said electrode is made of a material selected from the group consisting of ITO and ZnO:Al.
Claim 5
Dependent Claim
41 words
The electroluminescence device as claimed in claim 1, wherein said luminescence multi-layer further comprises a SrS:Ce luminescence layer comprising SrS and Ce which serves as an activator, which layer is interposed between said ZnS:Mn luminescence layer and said SrS:Ce luminescence layer.
Claim 6
Dependent Claim
41 words
The electroluminescence device as claimed in claim 1, wherein said luminescence multi-layer further comprises a ZnS:Mn luminescence layer comprising ZnS and Mn which serves as an activator, which layer is interposed between said ZnS:Mn luminescence layer and said SrS:Ce luminescence layer.
Claim 7
Dependent Claim
29 words
The electroluminescence device as claimed in claim 1, wherein said luminescence multi-layer comprises plural pairs of said ZnS:Mn luminescence layer and said SrS:Ce luminescence layer, which are alternatively overlaid.
Claim 8
Dependent Claim
53 words
The electroluminescence device as claimed in claim 1, wherein said insulating layer is made of a material selected from the group consisting of Y 2 O 3 , SiO 2 , Ta 2 O 5 , Al 2 O 3 , Si 3 N 4 , AlN, tungsten bronze ferroelectrics and perovskite ferroelectrics.
Claim 9
Dependent Claim
104 words
An electroluminescence device comprising a transparent substrate, a transparent electrode formed on said substrate, a first insulating layer formed on said transparent electrode, a first ZnS:Mn luminescence layer comprising ZnS and Mn which serves as an activator, formed on said insulating layer, a SrS:Ce luminescence layer comprising SrS and Ce which serves as an activator, formed on said ZnS:Mn luminescence layer, and a second ZnS:Mn luminescence layer comprising ZnS and Mn which serves as an activator, formed on said SrS:Ce luminescence layer, a second insulating layer formed on said second ZnS:Mn luminescence layer, and a back electrode layer formed on said second insulating layer.
Claim 10
Dependent Claim
104 words
An electroluminescence device comprising a transparent substrate, a transparent electrode formed on said substrate, a first insulating layer formed on said transparent electrode, a first ZnS:Mn luminescence layer comprising ZnS and Mn which serves as an activator, formed on said insulating layer, a SrS:Ce luminescence layer comprising SrS and Ce which serves as an activator, formed on said ZnS:Mn luminescence layer, and a second ZnS:Mn luminescence layer comprising ZnS and Mn which serves as an activator, formed on said SrS:Ce luminescence layer, a second insulating layer formed on said second ZnS:Mn luminescence layer, and a back electrode layer formed on said second insulating layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-02-22 | 1991-08-24 | 1992-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-22 | 1995-08-24 | 1996-02-23 | $3760.00 | Window Closed / Lapsed |
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