US6849869B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Long lifetime polymer light-emitting devices with improved luminous efficiency and improved radiance
Assignee: DuPont Displays Inc
•
Filing: 2000-07-17
•
Granted: 2005-02-01
•
Expires: 2020-07-17
Abstract
Abstract The luminous efficiency and radiance of light emitting diodes (LEDs) fabricated from organic emissive materials can be increased by using a multilayer cathode including a low work function layer and a high work function high reflectivity layer, in combination with a high work function, high reflectivitity anode material in the device.
Inventors
- 👤 Marie B. O'Regan
- 👤 Chi Zhang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:31
CPC Classifications
H; H10; H10K; H10K50/00; H10K50/80; H10K50/85; H10K50/852; H10K50/10; H10K50/17; H10K50/805; H10K50/81; H10K50/82; H10K50/826
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
104 words
A light-emitting device comprising: an anode comprising a semi-transparent layer having a high reflectivity and a high work function, wherein the semi-transparent layer has a reflectivity of at least 86%; and a cathode comprising at least one first cathode layer of a low work function material selected from metal, metal oxide and combinations thereof, and at least one second cathode layer having a high reflectivity and a high work function, at least one emissive layer disposed between the anode and first cathode layer wherein the emissive layer is in contact with the first cathode layer, wherein said device is a metal etalon microcavity structure.
Claim 2
Dependent Claim
104 words
A light-emitting device comprising: an anode comprising a semi-transparent layer having a high reflectivity and a high work function, wherein the semi-transparent layer has a reflectivity of at least 86%; and a cathode comprising at least one first cathode layer of a low work function material selected from metal, metal oxide and combinations thereof, and at least one second cathode layer having a high reflectivity and a high work function, at least one emissive layer disposed between the anode and first cathode layer wherein the emissive layer is in contact with the first cathode layer, wherein said device is a metal etalon microcavity structure.
Claim 3
Dependent Claim
19 words
The device of claim 1 , wherein the semi-transparent layer has a work function of greater than 4 eV.
Claim 4
Dependent Claim
20 words
The device of claim 1 , wherein the semi-transparent layer includes an anode material selected from metals and metal alloys.
Claim 5
Dependent Claim
20 words
The device of claim 1 , wherein the second cathode layer has a work function of greater than 4 eV.
Claim 6
Dependent Claim
21 words
The device of claim 1 , wherein the second cathode layer includes a cathode material selected from metals and metal alloys.
Claim 7
Dependent Claim
21 words
The device of claim 1 wherein the semi-transparent layer has a reflectivity of at least 91.4% at the wavelength of emission.
Claim 8
Dependent Claim
22 words
The device of claim 1 wherein the semi-transparent layer has a reflectivity of more than about 92% at the wavelength of emission.
Claim 9
Dependent Claim
22 words
The device of claim 1 wherein the semi-transparent layer has a reflectivity of from 92 to 96.5% at the wavelength of emission.
Claim 10
Dependent Claim
22 words
The device of claim 1 wherein the semi-transparent layer has a reflectivity of from 94 to 96.5% at the wavelength of emission.
Claim 11
Dependent Claim
22 words
The device of claim 1 wherein the semi-transparent layer has a reflectivity of more than about 96% at the wavelength of emission.
Claim 12
Dependent Claim
11 words
The device of claim 1 wherein the semi-transparent layer comprises silver.
Claim 13
Dependent Claim
15 words
The device of claim 1 wherein the at least one second cathode layer comprises silver.
Claim 14
Dependent Claim
24 words
The device of claim 1 wherein the at least one second cathode layer has reflectivity of at least 91.4% at the wavelength of emission.
Claim 15
Dependent Claim
26 words
The device of claim 1 wherein the at least one second cathode layer has reflectivity of between about 92 and 96.5% at the wavelength of emission.
Claim 16
Dependent Claim
27 words
The device of claim 1 wherein the at least one second cathode layer has reflectivity of between about 94 to 96.5 % at the wavelength of emission.
Claim 17
Dependent Claim
25 words
The device of claim 1 wherein the at least one second cathode layer has reflectivity of greater than about 96% at the wavelength of emission.
Claim 18
Dependent Claim
24 words
The device of claim 1 wherein the at least one second cathode layer includes a layer of air-stable metal coated on a silver layer.
Claim 19
Dependent Claim
50 words
The device of claim 1 wherein: the semi-transparent layer has a first surface adjacent to the cathode and an opposite second surface; the anode further comprising a passivation layer adjacent to the first surface, the passivation layer comprising a passivation material selected from poly(aniline), poly(aniline) blends, polythiophene, and polythiophene blends.
Claim 20
Dependent Claim
20 words
The device of claim 1 wherein the semi-transparent layer has a thickness of from about 100 up to 500 Å.
Claim 21
Dependent Claim
20 words
The device of claim 1 wherein the semi-transparent layer has a thickness of from about 250 up to 400 Å.
Claim 22
Dependent Claim
20 words
The device of claim 1 wherein the semi-transparent layer has a thickness of from about 275 up to 350 Å.
Claim 23
Dependent Claim
20 words
The device of claim 1 wherein the semi-transparent layer has a thickness of from about 275 up to 325 Å.
Claim 24
Dependent Claim
42 words
The device of claim 1 , wherein: the semi-transparent layer has a first surface adjacent to the cathode and an opposite second surface; the anode further comprises a transparent layer of indium/tin oxide adjacent to the second surface of the semi-transparent layer.
References Cited (Backward Citations)
US5247190A
Cited
US5317169A
Cited
US5047687A
Cited
US5059862A
Cited
US5512654A
Cited
US5408109A
Cited
US5151629A
Cited
US5626795A
Cited
US5469018A
Cited
US5616986A
Cited
EP0668620A1
Cited
US5619058A
Cited
US5723873A
Cited
US5747930A
Cited
US5780174A
Cited
US6137819A
Cited
WO1998010621A1
Cited
US5877038A
Cited
US6117529A
Cited
US5764324A
Cited
US5844363A
Cited
US6121727A
Cited
US6274979B1
Cited
WO1999059370A1
Cited
US6366017B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2008-02-01 | 2008-08-02 | 2009-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2012-02-01 | 2012-08-02 | 2013-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2016-02-01 | 2016-08-02 | 2017-02-01 | $7700.00 | Window Closed / Lapsed |