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US 2014/0197389 A1Published application
Oled having multi-component emissive layer
AssigneeUniversal Display Corporation
InventorsVadim Adamovich, Hitoshi Yamamoto, Michael S. Weaver, Chuanjun Xia
Life of this patent
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Abstract
Organic light-emitting devices having a multi-component organic electroluminescent layer. The organic electroluminescent layer comprises a phosphorescent dopant and a host material that is a mixture of at least three different compounds: a wide band gap host compound, an electron-transporting host compound, and a hole-transporting host compound. Use of such a multi-component organic electroluminescent layer may improve device efficiency and lifetime.
Claims21
An organic light-emitting device comprising:
- an anode electrode;
- a cathode electrode;
- and
- an organic electroluminescent layer disposed between the anode electrode and the cathode electrode, the organic electroluminescent layer comprising a phosphorescent dopant and a host material comprising the following three different compounds:
- (a) an electron-transporting host compound having a triplet energy that is greater than the triplet energy of the phosphorescent dopant;
- (b) a hole-transporting host compound having a triplet energy that is greater than the triplet energy of the phosphorescent dopant;
- (c) a wide band gap host compound having a molecular weight of less than 2,000;
- wherein the wide band gap host compound has a band gap of at least 2.0 eV and a triplet energy that is greater than the triplet energy of the phosphorescent dopant.
5 more elements
A method of making an organic light-emitting device, comprising:
- providing a first electrode;
- forming an organic electroluminescent layer over the first electrode, the organic electroluminescent layer comprising a phosphorescent dopant and a host material comprising the following three different compounds:
- (a) an electron-transporting host compound having a triplet energy that is greater than the triplet energy of the phosphorescent dopant;
- (b) a hole-transporting host compound having a triplet energy that is greater than the triplet energy of the phosphorescent dopant;
- (c) a wide band gap host compound having a molecular weight of less than 2,000;
- wherein the wide band gap host compound has a band gap of at least 2.0 eV and a triplet energy that is greater than the triplet energy of the phosphorescent dopant;
- forming a second electrode over the organic electroluminescent layer.
4 more elements
Dependencies are inferred from the claim text.