High efficiency multi-color electro-phosphorescent OLEDs
First Claim
1. An organic light emitting device, comprising:
- an anode, a cathode, and an emissive region;
whereinthe emissive region is located between the anode and the cathode, and comprises a host material, a plurality of emissive dopants, and a plurality of bands;
whereineach emissive dopant is doped into a separate band within the emissive region; and
the host material in at least a portion of the bands is different from one band to the next;
whereinat least one of the emissive dopants emits light by phosphorescence from a triplet molecular excited state; and
whereina combined emission of the plurality of emissive dopants sufficiently spans the visible spectrum to give a white emission.
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Abstract
The present invention relates to efficient organic light emitting devices (OLEDs) doped with multiple light-emitting dopants, at least one dopant comprising a phosphorescent emitter, in a thin film emissive layer or layers. The present invention is directed to an efficient phosphorescent organic light emitting device utilizing a plurality of emissive dopants in an emissive region, wherein at least one of the dopants is a phosphorescent material. Thus, the present invention provides an organic light emitting device comprising an emissive region, wherein the emissive region comprises a host material, and a plurality of emissive dopants, wherein the emissive region is comprised of a plurality of bands and each emissive dopant is doped into a separate band within the emissive region, and wherein at least one of the emissive dopants emits light by phosphorescence.
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Citations
19 Claims
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1. An organic light emitting device, comprising:
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an anode, a cathode, and an emissive region;
whereinthe emissive region is located between the anode and the cathode, and comprises a host material, a plurality of emissive dopants, and a plurality of bands;
whereineach emissive dopant is doped into a separate band within the emissive region; and the host material in at least a portion of the bands is different from one band to the next;
whereinat least one of the emissive dopants emits light by phosphorescence from a triplet molecular excited state; and
whereina combined emission of the plurality of emissive dopants sufficiently spans the visible spectrum to give a white emission. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An organic light emitting device, comprising:
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an anode, a cathode, and an emissive region;
whereinthe emissive region is located between the anode and the cathode, and comprises a host material, a plurality of emissive dopants, a host layer doped with at least one phosphorescent dopant, and a separate host layer doped with a fluorescent dopant;
whereinthe at least one phosphorescent dopant emits light by phosphorescence from a triplet molecular excited state; and a combined emission of the plurality of emissive dopants sufficiently spans the visible spectrum to give a white emission. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An organic light emitting device, comprising:
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an anode, a cathode, and an emissive region;
whereinthe emissive region is located between the anode and the cathode, and comprises; a host material and a plurality of emissive dopants;
whereinthe plurality of emissive dopants comprise a first phosphorescent dopant and a second phosphorescent dopant; the first and second phosphorescent dopants emit light by phosphorescence from a triplet molecular excited state; and a combined emission of the plurality of emissive dopants sufficiently spans the visible spectrum to give a white emission. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification