US5151629A
Expired / Lapsed
US
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Blue emitting internal junction organic electroluminescent device (I)
Assignee: Global OLED Technology LLC
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Filing: 1991-08-01
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Granted: 1992-09-29
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Expires: 2011-08-01
Abstract
Abstract An internal junction organic electroluminescent device is disclosed comprised of, in sequence, an anode, an organic hole injecting and transporting zone, an organic electron injecting and transporting zone, and a cathode. The organic electron injecting and transporting zone is comprised of an electron injecting layer in contact with the cathode and, interposed between the electron injecting layer and the organic hole injecting and transporting zone, a blue emitting luminescent layer comprised of a bis(R s -8-quinolinolato) aluminum(III)-μ-oxo-bis(R s -8-quinolinolato)- aluminum(III), where R s substituents are chosen to block the attachment of more than two substituted 8-quinolinolato ring nuclei to any one aluminum atom. Increased operating stability and device emission at even shorter blue wavelengths can be realized by the incorporation of a pentacarbocyclic aromatic fluorescent dye.
Inventors
- 👤 Steven A. VanSlyke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:16
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; C; C07; C07F; C07F5/00; C07F5/06; C07F5/069; C09; C09B; C09B57/00; C09B57/10; C09K; C09K11/00; C09K11/06; H10; H10K; H10K50/00; H10K50/10; H10K50/11; H10K85/00; H10K85/30; H10K85/321; H10K85/324; H10K85/361; H10K85/60; H10K85/615; H10K85/623; H10K85/624; H10K2102/00; H10K2102/10; H10K2102/101; H10K2102/103; H10K85/311
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
121 words
An internal junction organic electroluminescent device comprised of, in sequence, an anode, an organic hole injecting and transporting zone, an organic electron injecting and transporting zone, and a cathode, characterized in that said organic electron injecting and transporting zone is comprised of an electron injecting layer in contact with the cathode and, interposed between the electron injecting layer and the organic hole injecting and transporting zone, a blue emitting luminescent layer comprised of a charge accepting compound of the formula: (R.sup.s --Q).sub.2 --Al--O--Al--(Q--R.sup.s).sub.2 where Q in each occurrence represents a substituted 8-quinolinolato ring nucleus and R s represents an 8-quinolinolato ring substituent chosen to block sterically the attachment of more than two substituted 8-quinolinolato ring nuclei to any one aluminum atom.
Claim 2
Dependent Claim
121 words
An internal junction organic electroluminescent device comprised of, in sequence, an anode, an organic hole injecting and transporting zone, an organic electron injecting and transporting zone, and a cathode, characterized in that said organic electron injecting and transporting zone is comprised of an electron injecting layer in contact with the cathode and, interposed between the electron injecting layer and the organic hole injecting and transporting zone, a blue emitting luminescent layer comprised of a charge accepting compound of the formula: (R.sup.s --Q).sub.2 --Al--O--Al--(Q--R.sup.s).sub.2 where Q in each occurrence represents a substituted 8-quinolinolato ring nucleus and R s represents an 8-quinolinolato ring substituent chosen to block sterically the attachment of more than two substituted 8-quinolinolato ring nuclei to any one aluminum atom.
Claim 3
Dependent Claim
22 words
An internal device according to claim 1 further characterized in that R s is a 2-position substituent of the 8-quinolinolato ring nucleus.
Claim 4
Dependent Claim
21 words
An internal junction organic electroluminescent device according to claim 2 further characterized in that R s is an electron donating substituent.
Claim 5
Dependent Claim
33 words
An internal junction organic electroluminescent device according to claim 3 further characterized in that R s is chosen from the group consisting of amino, oxy and hydrocarbon groups containing up to carbon atoms.
Claim 6
Dependent Claim
26 words
An internal junction organic electroluminescent device according to claim 4 further characterized in that R s is a hydrocarbon containing from 1 to 6 carbon atoms.
Claim 7
Dependent Claim
27 words
An internal junction organic electroluminescent device according to claim 1 further characterized in that the 8-quinolinolato ring nucleus includes a 4-position ring substituent that is electron donating.
Claim 8
Dependent Claim
33 words
An internal junction organic electroluminescent device according to claim 6 further characterized in that the 4-position ring substituent is chosen from among amino, oxy and hydrocarbon groups containing up to 10 carbon atoms.
Claim 9
Dependent Claim
36 words
An internal junction organic electroluminescent device according to claim 1 further characterized in that the 8-quinolinolato ring nucleus includes in at least one of its 5,6 and 7 ring positions a substituent that is electron accepting.
Claim 10
Dependent Claim
50 words
An internal junction organic electroluminescent device according to claim 8 further characterized in that each of the 5, 6 and 7 ring position electron accepting substituents is chosen from among electron accepting cyano, halogen, and α-haloalkyl, α-haloalkoxy, amido, sulfonyl, carbonyl, carbonyloxy and oxycarbonyl substituents containing up to 10 carbon atoms.
Claim 11
Dependent Claim
22 words
An internal junction organic electroluminescent device according to claim 1 further characterized in that the luminescent layer additionally includes a fluorescent dye.
Claim 12
Dependent Claim
39 words
An internal junction organic electroluminescent device according to claim 10 further characterized in that the fluorescent dye is chosen to provide a favored recombination site for holes and electrons received from the charge accepting compound and is blue emitting.
Claim 13
Dependent Claim
30 words
An internal junction organic electroluminescent device according to claim 11 further characterized in that the blue emitting fluorescent dye exhibits a shorter wavelength emission peak than the charge accepting compound.
Claim 14
Dependent Claim
33 words
An internal junction organic electroluminescent device according to claim 11 further characterized in that the blue emitting fluorescent dye contains a stabilizing aromatic chromophoric unit containing at least 5 fused carbocyclic aromatic rings.
Claim 15
Dependent Claim
25 words
An internal junction organic electroluminescent device according to claim 13 further characterized in that the chromophoric unit contains from 20 to 40 ring carbon atoms.
Claim 16
Dependent Claim
37 words
An internal junction organic electroluminescent device according to claim 14 further characterized in that the fluorescent dye chromophoric unit is chosen from among those containing a perylene, benzopyrene, benzochrysene, benzonaphthacene, picene, pentaphene, pentacene, hexacene or anthanthrene nucleus.
Claim 17
Dependent Claim
29 words
An internal junction organic electroluminescent device according to claim 13 further characterized in that the fluorescent dye is present in a concentration ranging from 0.05 to 5 mole percent.
Claim 18
Dependent Claim
29 words
An internal junction organic electroluminescent device according to claim 16 further characterized in that the fluorecent dye is present in a concentration ranging from 0.2 to 3 mole percent.
Claim 19
Dependent Claim
29 words
An internal junction organic electroluminescent device according to claim 16 further characterized in that the fluorecent dye is present in a concentration ranging from 0.5 to 2 mole percent.
Claim 20
Dependent Claim
36 words
An internal junction organic electroluminescent device according to claim 1 further characterized in that the electron injecting and transporting zone and the hole injecting and transporting zone together exhibit a thickness of less than 1 μm.
Claim 21
Dependent Claim
29 words
An internal junction organic electroluminescent device according to claim 19 further characterized in that the organic electron injecting and transporting zone has a thickness of at least 300 Å.
Claim 22
Dependent Claim
30 words
An internal junction organic electroluminescent device according to claim 20 further characterized in that the electron injecting layer has a thickness in the range of from 50 to 250 Å.
Claim 23
Dependent Claim
23 words
An internal junction organic electroluminescent device according to claim 1 further characterized in that a metal oxinoid compound forms the electron injecting layer.
Claim 24
Dependent Claim
47 words
An internal junction organic electroluminescent device according to claim 22 further characterized in that the metal oxinoid compound satisfies the formula: ##STR14## where Me represents a metal, n is an integer of from 1 to 3, and Z represents the atoms necessary to complete an oxine nucleus.
Claim 25
Dependent Claim
62 words
An internal junction organic electroluminescent device according to claim 1 further characterized in that the blue emitting compound satisfies the formula: ##STR15## where R 2 represents an electron donating substituent, R 3 and R 4 each independently represent hydrogen or an electron donating substituent, and R 5 , R 6 and R 7 each independently represent hydrogen or an electron accepting substituent.
Claim 26
Dependent Claim
78 words
An internal junction organic electrluminescent device according to claim 24 further characterized in that the electron donating substituents are independently chosen from the group conssitign of --R', --OR' and --N(R")R', where R' is a hydrocarbon containing up to 6 carbon atoms and R" is hydrogen or R' and the electron accepting substituents are each independently chosen from among electron accepting cyano, halogen, and α-haloalkyl, α-haloalkoxy, amido, sulfonyl, carbonyl, carbonyloxy and oxycarbonyl substituents containing up to 6 carbon atoms.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-29 | 1996-03-30 | 1996-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-29 | 2000-03-30 | 2000-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-29 | 2004-03-30 | 2004-09-29 | $7700.00 | Window Closed / Lapsed |