Organic light emitting device structure for obtaining chromaticity stability
First Claim
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1. An organic light emitting device comprising:
- an anode;
an emissive region; and
a cathode,wherein the emissive region comprises;
a first emissive layer, comprising a first host material and a first emissive material, anda second emissive layer in physical contact with the first emissive layer and comprising a second host material and a second emissive material,and wherein;
the first emissive layer is nearer to the anode than the second emissive layer, and at least one of the first emissive material or the second emissive material is a phosphorescent emissive material.
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Abstract
The present invention relates to organic light emitting devices (OLEDs). The devices of the present invention are efficient white or multicolored phosphorescent OLEDs which have a high color stability over a wide range of luminances. The devices of the present invention comprise an emissive region having at least two emissive layers, with each emissive layer comprising a different host and emissive dopant, wherein at least one of the emissive dopants emits by phosphorescence.
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Citations
35 Claims
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1. An organic light emitting device comprising:
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an anode; an emissive region; and a cathode, wherein the emissive region comprises; a first emissive layer, comprising a first host material and a first emissive material, and a second emissive layer in physical contact with the first emissive layer and comprising a second host material and a second emissive material, and wherein; the first emissive layer is nearer to the anode than the second emissive layer, and at least one of the first emissive material or the second emissive material is a phosphorescent emissive material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An organic light emitting device comprising:
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an emissive region disposed between and electrically connected to an anode and a cathode, wherein the emissive region comprises; a first emissive layer, comprising a first host material and a first emissive material, and a second emissive layer in physical contact with the first emissive layer and comprising a second host material and a second emissive material, wherein; the contact between the first emissive layer and the second emissive layer provides an electron injection barrier, a hole injection barrier, or both, the first emissive layer is nearer to the anode than the second emissive layer, at least one of the first emissive material or the second emissive material is a phosphorescent emissive material, and wherein the device emits with CIE x,y-coordinates that vary less than about 0.04 over the luminance range of about 1000 cd/m2 to about 20,000 cd/m2. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An organic light emitting device comprising an emissive region disposed between the electrically connected to an anode and a cathode, wherein the emissive region comprises:
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a first emissive layer, comprising a first host material and a first emissive material, and a second emissive layer comprising a second host material and a second emissive material, and a blocking layer between and in contact with the first emissive layer and the second emissive layer, wherein; the blocking layer is an electron blocking layer or a hole blocking layer, the blocking layer separates the first emissive layer and the second emissive layer such that the first emissive layer and the second emissive layer are not in direct contact, and at least one of the first emissive material or the second emissive material is a phosphorescent emissive material. - View Dependent Claims (33, 34, 35)
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Specification