Patent US5227252A successfully refreshed from Google Patents.
US5227252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent device
Assignee: Nippon Kayaku Co Ltd
•
Filing: 1991-01-22
•
Granted: 1993-07-13
•
Expires: 2011-01-22
Abstract
Abstract Electroluminescent device with improved luminous efficiency, where a fluorescent emitting layer and a positive-hole transporting layer are layered on each other and arranged between a cathode and an anode, the two layers comprising organic compounds and the fluorescent emitting layer being composed of quinoline derivative as a host material, characterized by containing in the fluorescent emitting layer, as a guest material, a quinacridone compound of the following formula (A); ##STR1## wherein R 1 and R 2 are independently hydrogen, methyl group or chlorine or the dehydro form of the quinacridone compound.
Inventors
- 👤 Ryuji Murayama
- 👤 Takeo Wakimoto
- 👤 Hitoshi Nakada
- 👤 Masaharu Nomura
- 👤 Giichi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:02
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; C; C09; C09K; C09K11/00; C09K11/06; Y; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
An electroluminescent device, comprising: an anode; a positive-hole transporting layer made of an organic compound; a fluorescent emitting layer made of an organic compound; a cathode; and said anode, positive-hole transporting layer, fluorescent emitting layer and cathode being laminated in sequence, wherein said fluorescent emitting layer is made of a quinoline derivative and a quinacridone compound of substituted Quino[2,3-b] acridine-5,12-dihydro-7,14-dione capable of efficiently emitting light with a sharper distribution of emission spectrum upon application of a low voltage and represented by the following formula (A) ##STR11## wherein R 1 and R 2 are independently hydrogen, methyl group or chlorine.
Claim 2
Dependent Claim
99 words
An electroluminescent device, comprising: an anode; a positive-hole transporting layer made of an organic compound; a fluorescent emitting layer made of an organic compound; a cathode; and said anode, positive-hole transporting layer, fluorescent emitting layer and cathode being laminated in sequence, wherein said fluorescent emitting layer is made of a quinoline derivative and a quinacridone compound of substituted Quino[2,3-b] acridine-5,12-dihydro-7,14-dione capable of efficiently emitting light with a sharper distribution of emission spectrum upon application of a low voltage and represented by the following formula (A) ##STR11## wherein R 1 and R 2 are independently hydrogen, methyl group or chlorine.
Claim 3
Dependent Claim
31 words
The electroluminescent device according to claim 1, wherein said quinoline derivative is the aluminum complex of 8-hydroxyquinoline and said quinacridone compound is quinacridone wherein R 1 and R 2 are hydrogen.
Claim 4
Dependent Claim
23 words
The electroluminescent device according to claim 1, further comprising an organic-compound electron transporting layer arranged between said cathode and said fluorescent emitting layer.
Claim 5
Dependent Claim
99 words
An electroluminescent device, comprising: an anode; a positive-hole transporting layer made of an organic compound; a fluorescent emitting layer made of an organic compound; a cathode; and said anode, positive-hole transporting layer, fluorescent emitting layer and cathode being laminated in sequence, wherein said fluorescent emitting layer is made of a quinoline derivative and a quinacridone compound of substituted Quino[2,3-b] acridine-5,6,12,13-tetrahydro-7,14-dione capable of efficiently emitting light with a sharper distribution of emission spectrum upon application of a low voltage and represented by the following formula (C) ##STR12## wherein R 3 and R 4 are independently hydrogen, methyl group or chlorine.
Claim 6
Dependent Claim
99 words
An electroluminescent device, comprising: an anode; a positive-hole transporting layer made of an organic compound; a fluorescent emitting layer made of an organic compound; a cathode; and said anode, positive-hole transporting layer, fluorescent emitting layer and cathode being laminated in sequence, wherein said fluorescent emitting layer is made of a quinoline derivative and a quinacridone compound of substituted Quino[2,3-b] acridine-5,6,12,13-tetrahydro-7,14-dione capable of efficiently emitting light with a sharper distribution of emission spectrum upon application of a low voltage and represented by the following formula (C) ##STR12## wherein R 3 and R 4 are independently hydrogen, methyl group or chlorine.
Claim 7
Dependent Claim
31 words
The electroluminescent device according to claim 4, wherein said quinoline derivative is the aluminum complex of 8-hydroxyquinoline and said quinacridone compound is quinacridone wherein R 3 and R 4 are hydrogen.
Claim 8
Dependent Claim
23 words
The electroluminescent device according to claim 4, further comprising an organic-compound electron transporting layer arranged between said cathode and said fluorescent 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) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |