Highly efficient OLEDs using doped ambipolar conductive molecular organic thin films
First Claim
1. An organic light emitting device, comprising:
- an anode layer comprising an anode material having a characteristic ionization potential;
an organic hole injecting layer comprising an organic hole injecting material having a characteristic ionization potential, the organic hole injecting layer being in direct contact with the anode layer, wherein the ionization potential of the organic hole injecting material is not more than 0.7 eV greater than the ionization potential of the anode material;
an organic electron transporting layer comprising an organic electron transporting material and an organic hole-trapping emissive material, the organic electron transporting layer being in direct contact with the organic hole injecting layer; and
a cathode layer in direct contact with the organic electron transporting layer.
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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.
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Citations
19 Claims
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1. An organic light emitting device, comprising:
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an anode layer comprising an anode material having a characteristic ionization potential;
an organic hole injecting layer comprising an organic hole injecting material having a characteristic ionization potential, the organic hole injecting layer being in direct contact with the anode layer, wherein the ionization potential of the organic hole injecting material is not more than 0.7 eV greater than the ionization potential of the anode material;
an organic electron transporting layer comprising an organic electron transporting material and an organic hole-trapping emissive material, the organic electron transporting layer being in direct contact with the organic hole injecting layer; and
a cathode layer in direct contact with the organic electron transporting layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An organic light emitting device, comprising:
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an ITO anode layer;
a hole injecting layer comprising 4,4′
,4″
-tris(3-methylphenylphenylamino)triphenylamine, the hole injecting layer being in direct contact with the ITO anode layer;
an emissive layer comprising 4,4′
-N,N′
-dicarbazole-biphenyl doped with fac tris(2-phenylpyridine)iridium, the emissive layer being in direct contact with the hole injecting layer; and
a cathode layer comprising magnesium and silver, the cathode layer being in direct contact with the emissive layer. - View Dependent Claims (19)
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Specification