Organic light emitting devices with wide gap host materials
First Claim
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1. An organic light emitting device comprising an emissive layer disposed between and electrically connected to an anode and a cathode, wherein the emissive layer comprises a host material and a phosphorescent emissive material, and wherein the emissive material is the primary carrier of holes and electrons;
- the host material has and energy gap of at least 3.2 eV; and
the device has a external quantum efficiency of at least about 3%.
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Abstract
The present invention relates to organic light emitting devices (OLEDs), and more specifically to efficient OLEDs having an emissive layer having host material with a wide energy gap. The present invention also relates to materials for use as a wide gap host material.
73 Citations
29 Claims
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1. An organic light emitting device comprising an emissive layer disposed between and electrically connected to an anode and a cathode, wherein the emissive layer comprises a host material and a phosphorescent emissive material, and wherein
the emissive material is the primary carrier of holes and electrons; -
the host material has and energy gap of at least 3.2 eV; and
the device has a external quantum efficiency of at least about 3%. - View Dependent Claims (2, 3, 4, 5)
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6. An organic light emitting device comprising an emissive layer disposed between and electrically connected to an anode and a cathode, wherein the emissive layer comprises a host material and a phosphorescent emissive material, and wherein
the emissive material is the primary carrier of holes; -
the host material is the primary carrier of electrons, and the host material has an energy gap of at least 3.2 eV; and
the device has a external quantum efficiency of at least about 3%. - View Dependent Claims (7, 8, 9)
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10. An organic light emitting device comprising an emissive layer disposed between and electrically connected to an anode and a cathode, wherein the emissive layer comprises a host material and a phosphorescent emissive material, and wherein
the emissive material is the primary carrier of electrons; -
the host material is the primary carrier of holes, and the host material has an energy gap of at least 3.2 eV; and
the device has a external quantum efficiency of at least about 3%. - View Dependent Claims (11, 12, 13)
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- 14. An organic light emitting device comprising an emissive layer disposed between and electrically connected to an anode and a cathode, wherein the emissive layer comprises a host material and a phosphorescent emissive material, wherein the host material comprises a compound of the formula I
- 20. An organic light emitting device comprising an emissive layer disposed between and electrically connected to an anode and a cathode, wherein the emissive layer comprises an host material and an emissive material, wherein the host material comprises a compound of the formula II
- 26. An organic light emitting device comprising an emissive layer disposed between and electrically connected to an anode and a cathode, wherein the emissive layer comprises an host material and an emissive material, wherein the host material comprises a compound of the formula V
Specification