Highly efficient OLEDs using doped ambipolar conductive...

Details Highly efficient OLEDs using doped ambipolar conductive... Highly efficient OLEDs using doped ambipolar conductive...

2005-05-31

2005-05-31

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C313S506000

Reexamination Certificate

active

06900588

ABSTRACT:
The present invention is directed to simplified OLED structures comprising an anode layer, a hole injecting layer (HIL) in direct contact with the anode layer, an emissive organic electron transporting layer (ETL) in direct contact with the hole injecting layer, and a cathode layer in direct contact with the emissive organic electron transporting layer. The hole injecting material used in the hole injecting layer is characterized, in particular, as being an organic material having an ionization potential that is not more than about 0.7 eV greater than the ionization potential of the material used for the anode layer. The emissive organic electron transporting layer comprises an organic electron transporting material and an organic hole-trapping emissive material, for example, an organic phosphorescent material that produces emission from a triplet excited state of an organic molecule.

REFERENCES:
patent: 5540999 (1996-07-01), Yamamoto et al.
patent: 5668438 (1997-09-01), Shi et al.
patent: 5703436 (1997-12-01), Forrest et al.
patent: 5707745 (1998-01-01), Forrest et al.
patent: 5709959 (1998-01-01), Adachi et al.
patent: 5721160 (1998-02-01), Forrest et al.
patent: 5757026 (1998-05-01), Forrest et al.
patent: 5757139 (1998-05-01), Forrest et al.
patent: 5811833 (1998-09-01), Thompson
patent: 5834893 (1998-11-01), Bulovic et al.
patent: 5844363 (1998-12-01), Gu et al.
patent: 5861219 (1999-01-01), Thompson et al.
patent: 5874803 (1999-02-01), Garbuzov et al.
patent: 5917280 (1999-06-01), Burrows et al.
patent: 5922396 (1999-07-01), Thompson
patent: 5932895 (1999-08-01), Shen et al.
patent: 5953587 (1999-09-01), Forrest et al.
patent: 5981306 (1999-11-01), Burrows et al.
patent: 5986268 (1999-11-01), Forrest et al.
patent: 5986401 (1999-11-01), Thompson et al.
patent: 5998803 (1999-12-01), Forrest et al.
patent: 6005252 (1999-12-01), Forrest et al.
patent: 6013538 (2000-01-01), Burrows et al.
patent: 6013982 (2000-01-01), Thompson et al.
patent: 6091382 (2000-07-01), Shioya et al.
patent: 6097147 (2000-08-01), Baldo et al.
patent: 6229505 (2001-05-01), Fujii
patent: 6420031 (2002-07-01), Parthasarathy et al.
patent: 6469437 (2002-10-01), Parthasarathy et al.
patent: 6573651 (2003-06-01), Adachi et al.
patent: 2002/0034656 (2002-03-01), Thompson et al.
patent: 2003/0171060 (2003-09-01), Hirano et al.
Baldo et al., “Very high-efficiency green organic light-emitting devices based on electropohosphorescence,” Applied Physics Letters, vol. 75, No. 1, (1999).
Adachi, et al., “High-efficiency organic electrophosphorescent devices with tris (2-phenylpyridine) iridium doped into electron-transporting materials,” Applied Physics Letters, Vo. 77, No. 6 (2000).
Adachi, et al., “Efficient electrophosphorescence using a doped ambipolar conductive molecular organic thing film,” Organic Electronics, vol. 2, pp 37-43 (2000).
M. A. Baldo, et al., “Highly efficient phosphorescent emission from organic electroluminescent devices,” Nature, Sep. 1998, vol. 395, pp. 151-154.
D.F. O'Brien, et al., “Improved energy transfer in electrophosphorescent devices”,Applied Physics Letters, vol. 74, No. 3, pp. 442-444, (Jan. 18, 1999).
M.A. Baldo, et al., “Very high efficiency green organic light-emitting devices based on electrophosphorescence”,Applied Physics Letters, vol. 75, No. 1, pp. 4-6, (1999).
T. Tsutsui et al., “High Quantum Efficiency in Organic Light-Emitting Devices with Iridium-Complex as a Triplet Emissive Center”,Japanese J. Appl. Phys., Part 2, vol. 38, pp. L1502-L1504 (Dec. 15, 1999).
C. Adachi et al., “High-efficiency organic electrophosphorescent devices with tris(2-phenylpyridine) iridium doped into electron-transporting materials”,Appl. Phys. Lett., vol. 77, No. 6, pp. 904-906 (Aug. 7, 2000).
M. J. Yang et al., “Use of Poly(9-vinylcarbazole) as Host Material for Iridium Complexes in High-Efficiency Organic Light-Emitting Devices”,Japanese J. Appl. Phys., Part 2, vol. 39, pp. L828-L829 (2000).
C. L. Lee et al., “Polymer phosphorescent light-emitting devices doped with tris(2-phenylpyridine) iridium as a triplet emitter”,Appl. Phys. Lett., vol. 77, No. 15, pp. 2280-2282 (Oct. 9, 2000).
Shirota et al., “Multilayered organic electroluminescent device using a novel starburst molecule, 4,4′,4″-tris(3-methylphenylphenylamino)triphenylamine, as a hole transport material”,Appl. Phys. Lett., vol. 65, No. 7, pp. 807-809 (Aug. 15, 1994).
Baldo et al., “Excitonic singlet-triplet ratio in s semiconducting organic thin film”,Physical Review B, pp. 422-428 (Nov. 15, 1999).
Kwong et al., “Efficient, Saturated Red Organic Light Emitting Devices Based on Phosphorescent Platinum (II) Porphyrins”,Chemistry of Materials, vol. 11, No. 12, pp. 3709-3713 (Dec. 1999).
Djurovich et al., “Ir(III) Cyclometalated Complexes as Efficient Phosphorescent Emitters in Polymer Blend and Organic LEDs”,Polymer Preprint, vol. 41, No. 1, pp. 770-771 (Mar. 2000).
C. Adachi et al., “Electroluminescence mechanisms in organic light emitting devices employing a europium chelate doped in a wide energy gap bipolar conducting host”,J. Appl. Phys., vol. 87, No. 11, pp. 8049-8055 (Jun. 1, 2000).
M.A. Baldo et al., “Transient analysis of organic electrophosphorescence”,Phys. Rev. B, vol. 62, No. 16, pp. 10967-10977 (Oct. 15, 2000).
Y. Kunugi, et al., “A Vapochromic LED”,J. Am. Chem. Soc., vol. 120, No. 3, pp. 589-590, 1998.

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