Patent US5629389A successfully refreshed from Google Patents.
US5629389A
Expired / Lapsed
US
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Polymer-based electroluminescent device with improved stability
Assignee: Innolux Corp
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Filing: 1995-06-06
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Granted: 1997-05-13
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Expires: 2015-06-06
Abstract
Abstract An improved electroluminescent device which includes a hole injection electrode, an electron injection electrode, and an electroluminescent layer located between the hole and electron injection electrodes. The electroluminescent layer includes an organic polymer and a hindered phenolic additive in a concentration greater than 4% by weight. The preferred organic polymer is a derivative of PPV. The preferred hindered phenolic additives are and 2,4,6 tri-tert-butyl phenol 2,6 di-tert-butyl-methylphenol. The device has higher efficiency and a slower rate of degradation than devices lacking the hindered phenolic additive.
Inventors
- 👤 Daniel B. Roitman
- 👤 James R. Sheats
- 👤 Mark R. Hueschen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:57
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; C09K11/025; C09K11/06; H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H10; H10K; H10K50/00; H10K50/10; H10K50/11; H10K85/00; H10K85/10; H10K85/111; H10K85/114; Y; Y10; Y10S; Y10S362/00; Y10S362/80
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
63 words
An electroluminescent device comprising: a hole injection electrode; an electron injection electrode; and an electroluminescent layer comprising an organic polymer between said hole and electron injection electrodes, said electroluminescent layer further comprising a hindered phenolic additive in a concentration greater than 4% by weight, wherein said hindered phenolic additive is chosen from the group consisting of 2,6 di-tert-butyl-methylphenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol, or 2,4,6 tri-butyl phenol.
Claim 2
Dependent Claim
63 words
An electroluminescent device comprising: a hole injection electrode; an electron injection electrode; and an electroluminescent layer comprising an organic polymer between said hole and electron injection electrodes, said electroluminescent layer further comprising a hindered phenolic additive in a concentration greater than 4% by weight, wherein said hindered phenolic additive is chosen from the group consisting of 2,6 di-tert-butyl-methylphenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol, or 2,4,6 tri-butyl phenol.
Claim 3
Dependent Claim
19 words
The electroluminescent device of claim 1 wherein said electroluminescent layer comprises Poly (2,5-bis (5,6-dihydrocholestanoxy)-1,4-phenylene vinylene) or poly (2-methoxy-5-(2-'ethyl-hexoxy)-1,4-phenylene vinylene).
Claim 4
Dependent Claim
21 words
The electroluminescent device of claim 1 further comprising an electron transport layer between said electron injection electrode and said electroluminescent layer.
Claim 5
Dependent Claim
21 words
The electroluminescent device of claim 1 further comprising a hole transport layer between said hole injection electrode and said electroluminescent layer.
Claim 6
Dependent Claim
36 words
An electroluminescent material comprising Poly(2,5-bis(5,6-dihydrocholestanoxy)-1,4-phenylene vinylene), and poly(2-methoxy- 5-(2-'ethyl-hexoxy)-1,4-phenylene vinylene) in combination with a hindered phenolic additive, wherein said hindered phenolic additive is chosen from the group consisting of 2,6 di-tert-butylmethylphenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol, or 2,4,6 tri-tert-butyl phenol.
Claim 7
Dependent Claim
36 words
An electroluminescent material comprising Poly(2,5-bis(5,6-dihydrocholestanoxy)-1,4-phenylene vinylene), and poly(2-methoxy- 5-(2-'ethyl-hexoxy)-1,4-phenylene vinylene) in combination with a hindered phenolic additive, wherein said hindered phenolic additive is chosen from the group consisting of 2,6 di-tert-butylmethylphenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol, or 2,4,6 tri-tert-butyl phenol.
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) | 2000-05-12 | 2000-11-11 | 2001-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-05-12 | 2004-11-11 | 2005-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-05-12 | 2008-11-11 | 2009-05-13 | $7700.00 | Window Closed / Lapsed |