Patent US3637880A successfully refreshed from Google Patents.
Patent US5276381A successfully refreshed from Google Patents.
US5276381A
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Organic electroluminescent device
Assignee: Nippon Kayaku Co Ltd
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Filing: 1992-02-26
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Granted: 1994-01-04
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Expires: 2012-02-26
Abstract
Abstract An organic electroluminescent device which includes a cathode, an organic emitting layer which includes a quinoline derivative and a quinacridone or quinazoline compound, an organic positive hole transport layer, and an anode, laminated in sequence, has a high emission efficiency and a high color purity of light emitted from the EL device.
Inventors
- 👤 Takeo Wakimoto
- 👤 Ryuji Murayama
- 👤 Hitoshi Nakada
- 👤 Masaharu Nomura
- 👤 Giichi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:48
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/06; H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; Y; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
177 words
An organic electroluminescent device comprising a cathode, an organic emitting layer comprising a quinoline derivative, an organic positive hole transport layer, and an anode, which are laminated in sequence, wherein said emitting layer further comprises a compound selected from the group consisting of a quinacridone compound represented by the structure formula 1 below ##STR28## and a quinazoline compound represented by the structure formula 2 below ##STR29## where ring A ##STR30## is ##STR31## ring B ##STR32## is ##STR33## R 1 -R 4 are independently a hydrogen atom, halogen atom, alkyl group, or alkoxy group, or R 1 and R 2 or R 3 and R 4 together form a fused benzene ring or ##STR34## wherein R 5 is an alkyl group, provided that, when said ring A of formula 1 is ##STR35## R 1 -R 4 are not all hydrogen atoms, R 1 and R 3 are not hydrogen atoms, when R 2 and R 4 are methyl groups, and R 1 and R 3 are not hydrogen atoms when R 2 and R 4 are chlorine atoms.
Claim 2
Dependent Claim
177 words
An organic electroluminescent device comprising a cathode, an organic emitting layer comprising a quinoline derivative, an organic positive hole transport layer, and an anode, which are laminated in sequence, wherein said emitting layer further comprises a compound selected from the group consisting of a quinacridone compound represented by the structure formula 1 below ##STR28## and a quinazoline compound represented by the structure formula 2 below ##STR29## where ring A ##STR30## is ##STR31## ring B ##STR32## is ##STR33## R 1 -R 4 are independently a hydrogen atom, halogen atom, alkyl group, or alkoxy group, or R 1 and R 2 or R 3 and R 4 together form a fused benzene ring or ##STR34## wherein R 5 is an alkyl group, provided that, when said ring A of formula 1 is ##STR35## R 1 -R 4 are not all hydrogen atoms, R 1 and R 3 are not hydrogen atoms, when R 2 and R 4 are methyl groups, and R 1 and R 3 are not hydrogen atoms when R 2 and R 4 are chlorine atoms.
Claim 3
Dependent Claim
18 words
An organic electroluminescent device according to claim 1, wherein said quinoline derivative is the Aluminum complex of 8-hydroxyquinoline.
Claim 4
Dependent Claim
23 words
An organic electroluminescent device according to claim 1 further comprising an organic electron transport layer arranged between said cathode and said emitting layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-03 | 1997-07-05 | 1998-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-03 | 2001-07-05 | 2002-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-03 | 2005-07-05 | 2006-01-04 | $7700.00 | Window Closed / Lapsed |