US5405709A
Expired / Lapsed
US
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White light emitting internal junction organic electroluminescent device
Assignee: Global OLED Technology LLC
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Filing: 1993-09-13
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Granted: 1995-04-11
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Expires: 2013-09-13
Abstract
Abstract An internal junction organic electroluminescent device comprises, in sequence, an anode, an organic electroluminescent medium, and a cathode, the organic electroluminescent medium further comprising a hole injecting and transporting zone contiguous with the anode and an electron injecting and transporting zone contiguous with the cathode, the electron injecting and transporting zone further comprising an electron injecting layer in contact with the cathode, characterized in that the portion of the organic electroluminescent medium that is interposed between the electron injecting layer and the hole injecting and transporting zone is capable of emitting white light in response to hole-electron recombination and comprises a fluorescent material and a mixed ligand aluminum chelate of the formula (R.sup.s --Q).sub.2 --Al--O--L where Q in each occurrence represents a substituted 8-quinolinolato ligand, R s represents an 8-quinolinolato ring substituent chosen to block sterically the attachment of more than two substituted 8-quinolinolato ligands to the aluminum atoms, O--L is a phenolato ligand, and L is a hydrocarbon group that includes a phenyl moiety.
Inventors
- 👤 Jon E. Littman
- 👤 Steve A. VanSlyke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:39
CPC Classifications
H; H10; H10K; H10K50/00; H10K50/10; H10K50/11; C; C09; C09K; C09K11/00; C09K11/06; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H10K85/00; H10K85/30; H10K85/321; H10K85/324; H10K85/60; H10K85/631; Y; Y02; Y02B; Y02B20/00; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
165 words
An internal junction organic electroluminescent device comprising, in sequence, an anode, an organic electroluminescent medium, and a cathode, said organic electroluminescent medium further comprising a hole injecting and transporting zone contiguous with said anode and an electron injecting and transporting zone contiguous with said cathode, said electron injecting and transporting zone further comprising an electron injecting layer in contact with said cathode, characterized in that a portion of said organic electroluminescent medium that is interposed between said electron injecting layer and said hole injecting and transporting zone is capable of emitting white light in response to hole-electron recombination and comprises a fluorescent material and a mixed ligand aluminum chelate of the formula (R.sup.s --Q).sub.2 --Al--O--L where Q in each occurrence represents a substituted 8-quinolinolato ligand, R s represents an 8-quinolinolato ring substituent chosen to block sterically the attachment of more than two substituted 8-quinolinolato ligands to the aluminum atom, O--L is a phenolato ligand, and L is a hydrocarbon group that includes a phenyl moiety.
Claim 2
Dependent Claim
165 words
An internal junction organic electroluminescent device comprising, in sequence, an anode, an organic electroluminescent medium, and a cathode, said organic electroluminescent medium further comprising a hole injecting and transporting zone contiguous with said anode and an electron injecting and transporting zone contiguous with said cathode, said electron injecting and transporting zone further comprising an electron injecting layer in contact with said cathode, characterized in that a portion of said organic electroluminescent medium that is interposed between said electron injecting layer and said hole injecting and transporting zone is capable of emitting white light in response to hole-electron recombination and comprises a fluorescent material and a mixed ligand aluminum chelate of the formula (R.sup.s --Q).sub.2 --Al--O--L where Q in each occurrence represents a substituted 8-quinolinolato ligand, R s represents an 8-quinolinolato ring substituent chosen to block sterically the attachment of more than two substituted 8-quinolinolato ligands to the aluminum atom, O--L is a phenolato ligand, and L is a hydrocarbon group that includes a phenyl moiety.
Claim 3
Dependent Claim
62 words
An internal junction organic electroluminescent device according to claim 1 wherein said portion of the organic electroluminescent medium that is interposed between said electron injecting layer and said hole injecting and transporting zone comprises a red light emitting electron transporting layer contiguous with said electron injecting layer and a blue light emitting recombination layer contiguous with said hole injecting and transporting zone.
Claim 4
Dependent Claim
64 words
An internal junction organic electroluminescent device according to claim 2 wherein said red light emitting electron transporting layer comprises a fluorescent material capable of emitting light in response to hole-electron recombination and a metal oxinoid compound of the formula ##STR7## where M represents a metal, n is an integer from 1 to 3 and Z represents the atoms necessary to complete an oxine nucleus.
Claim 5
Dependent Claim
31 words
An internal junction organic electroluminescent device according to claim 3 wherein said fluorescent material is a polymethine dye, a dicyanomethylenepyran dye, a dicyanomethylenethiopyran dye, a pyrylium dye, or a thiopyrylium dye.
Claim 6
Dependent Claim
21 words
An internal junction organic electroluminescent device according to claim 3 wherein said metal oxinoid compound is a trisoxine chelate of aluminum.
Claim 7
Dependent Claim
36 words
An internal junction organic electroluminescent device according to claim 3 wherein said fluorescent material is present in a concentration of from 10 -3 to 10 mole percent, based on the moles of said metal oxinoid compound.
Claim 8
Dependent Claim
92 words
An internal junction organic electroluminescent device according to claim 2 wherein said blue light emitting recombination layer comprises a fluorescent material capable of emitting light in response to hole-electron recombination and a mixed ligand aluminum chelate of the formula (R.sup.s --Q).sub.2 --Al--O--L where Q in each occurrence represents a substituted 8-quinolinolato ligand, R s represents an 8-quinolinolato ring substituent chosen to block sterically the attachment of more than two substituted 8-quinolinolato ligands to the aluminum atom, O--L is a phenolato ligand, and L is a hydrocarbon group that includes a phenyl moiety.
Claim 9
Dependent Claim
20 words
An internal junction organic electroluminescent device according to claim 7 wherein said fluorescent material is a pentacarbocyclic aromatic fluorescent dye.
Claim 10
Dependent Claim
29 words
An internal junction organic electroluminescent device according to claim 8 wherein said pentacarbocyclic aromatic fluorescent dye contains a perylene, benzopyrene, benzochrysene, benzonaphtharene, picene, pentaphene, pentacene, hexacene, or anthanthrene nucleus.
Claim 11
Dependent Claim
18 words
An internal junction organic electroluminescent device according to claim 9 wherein said pentacarbocyclic aromatic fluorescent dye is perylene.
Claim 12
Dependent Claim
36 words
An internal junction organic electroluminescent device according to claim 7 wherein said fluorescent material is present in a concentration of from 0.05 to 5 mole percent, based on the moles of said mixed ligand aluminum chelate.
Claim 13
Dependent Claim
51 words
An internal junction organic electroluminescent device according to claim 7 wherein said mixed ligand aluminum chelate satisfies the formula ##STR8## wherein L is a hydrocarbon group that includes a phenyl moiety and R 2 to R 7 represent substituents at each of ring positions 2 to 7 of the 8-quinolinolato rings.
Claim 14
Dependent Claim
22 words
An internal junction organic electroluminescent device according to claim 7 wherein R s is a 2-position substituent of the 8-quinolinolato ring nucleus.
Claim 15
Dependent Claim
23 words
An internal junction organic electroluminescent device according to claim 13 where R s is a hydrocarbon group of 1 to 6 carbon atoms.
Claim 16
Dependent Claim
17 words
An internal junction organic electroluminescent device according to claim 14 wherein R s is a methyl group.
Claim 17
Dependent Claim
16 words
An internal junction organic electroluminescent device according to claim 7 wherein L contains a naphthalene nucleus.
Claim 18
Dependent Claim
27 words
An internal junction organic electroluminescent device according to claim 7 wherein said phenyl moiety includes an aliphatic or aromatic hydrocarbon substituent of 1 to 12 carbon atoms.
Claim 19
Dependent Claim
27 words
An internal junction organic electroluminescent device according to claim 1 wherein said hole injecting and transporting zone comprises a hole injecting layer and a hole transporting layer.
Claim 20
Dependent Claim
19 words
An internal junction organic electroluminescent device according to claim 18 wherein said hole injecting layer comprises a porphyrinic compound.
Claim 21
Dependent Claim
20 words
An internal junction organic electroluminescent device according to claim 18 wherein said hole transporting layer comprises an aromatic tertiary amine.
Claim 22
Dependent Claim
53 words
An internal junction organic electroluminescent device according to claim 20 wherein said aromatic tertiary amine is a tetraaryldiamine of the formula ##STR9## where Are is an arylene group, n is an integer of from 1 to 4, and Ar, R 7 , R 8 , and R 9 are independently selected aryl groups.
Claim 23
Dependent Claim
35 words
An internal junction organic electroluminescent device according to claim 1 wherein said cathode comprises a metal having a work function less than 4.0 eV and a metal having a work function greater than 4.0 eV.
Claim 24
Dependent Claim
17 words
An internal junction organic electroluminescent device according to claim 22 wherein said cathode comprises magnesium and silver.
Claim 25
Dependent Claim
23 words
An internal junction organic electroluminescent device according to claim 1 wherein said organic electroluminescent medium has a thickness of less than 1 μm.
Claim 26
Dependent Claim
25 words
An internal junction organic electroluminescent device according to claim 1 wherein said electron injecting and transporting zone has a thickness of at least 300 Å.
References Cited (Backward Citations)
US4539507A
Cited
US4983469A
Cited
US4720432A
Cited
US4885211A
Cited
US4769292A
Cited
US5073466A
Cited
US5126214A
Cited
US4950950A
Cited
US5059862A
Cited
US5061569A
Cited
US5059861A
Cited
US5047687A
Cited
US5283132A
Cited
US5141671A
Cited
US5150006A
Cited
US5151629A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-04-10 | 1998-10-10 | 1999-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-10 | 2002-10-10 | 2003-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-10 | 2006-10-10 | 2007-04-11 | $7700.00 | Window Closed / Lapsed |