Organic light emitting devices having improved performance
AssigneeXerox Corporation
InventorsHany M. Aziz, Zoran D. Popovic, Nan-Xing Hu
Life of this patent
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Abstract
An organic light emitting device includes a mixed region composed of a mixture of a hole transport material, an electron transport material and at least one dopant material. The hole transport material and/or the electron transport material can optionally be an emitter. The materials of the mixed region can be selected to provide various emission colors from the organic light emitting device. The organic light emitting device also includes at least one of a hole transport material region and an electron transport material region on the mixed region. The hole transport material region, the electron transfer material region, and/or the mixed region can be formed with a plurality of layers.
Claims48
An organic light emitting device, comprising:
- a mixed region having a first surface and a second surface, the mixed region comprising a mixture of a hole transport material, an electron transport material and at least one dopant, the dopant being an emitter, at least one of the hole transport material and the electron transport material optionally being an emitter;
- at least one of (i) a hole transport region on the first surface, and (ii) an electron transport region on the second surface;
- an anode in contact with the hole transport region on the first surface or with the first surface;
- and
- a cathode in contact with the electron transport region on the second surface or with the second surface.
A method of making an organic light emitting device, comprising:
- forming a mixed region having a first surface and a second surface, the mixed region comprising a mixture of a hole transport material, an electron transport material and at least one dopant, the dopant being an emitter, at least one of the hole transport material and the electron transport material optionally being an emitter;
- forming at least one of (i) a hole transport region on the first surface, and (ii) an electron transport region on the second surface;
- forming an anode in contact with the hole transport region on the first surface or with the first surface;
- and
- forming a cathode in contact with the electron transport region on the second surface or with the second surface.
An organic light emitting device, comprising:
- a mixed region having a first surface and a second surface, the mixed region comprising a mixture of a hole transport material, an electron transport material and at least one dopant that is an emitter;
- an anode;
- a hole transport region between the first surface of the mixed region and the anode;
- a cathode;
- and
- an electron transport region between the second surface of the mixed region and the cathode.
An organic light emitting device, comprising:
- a mixed region having a first surface and a second surface, the mixed region comprising a mixture of a hole transport material, an electron transport material and at least one dopant that is an emitter, and the mixed region having a mixing ratio of the hole transport material, electron transport material and at least one dopant that is not varied in the mixed region;
- an anode;
- a cathode;
- and
- at least one of (i) a hole transport region between the first surface of the mixed region and the anode, and (ii) an electron transport region between the second surface of the mixed region and the cathode.
Dependencies are inferred from the claim text.