Method of manufacture of a multi-layer phosphorescent organic light emitting device, and articles thereof

A device, phosphorescence technology, applied in the field of manufacturing multilayer phosphorescent organic light-emitting devices
CN102171850AInactive Publication Date: 2011-08-31GENERAL ELECTRIC CO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GENERAL ELECTRIC CO
Publication Date
2011-08-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method for forming multi-emissive phosphorescent layers for a phosphorescent OLED comprises coating a first phosphorescent material from a first solvent onto a first electrode and removing the first solvent to form a first emissive layer; and coating a second phosphorescent material from a second solvent onto the first emissive layer and removing the second solvent to form a second emissive layer, wherein the first and second emissive layers are not cured after coating, and wherein the first emissive layer has negligible solubility in the second solvent.
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Description

Background of the invention

[0001] In general, the present invention relates to methods of making multilayer phosphorescent organic light emitting devices and articles thereof.

[0002] An organic light emitting device (OLED) having a multilayer structure is generally preferred to achieve high performance and meet specific requirements such as white light required for lighting. Phosphorescent materials are desired in OLEDs because they can efficiently achieve 100% internal quantum efficiency (IQE), compared to 25% for fluorescent materials.

[0003] Current state of the art phosphorescent materials in the form of small molecules can be utilized. Small-molecule-based multilayer phosphorescent OLEDs are usually fabricated by vacuum-depositing organic materials, which suffers from high cost and low throughput.

[0004] Multilayer phosphorescent OLEDs fabricated by solvent coating such as gravure coating, screen printing, and other solvent coating methods are not described, alth...

Claims

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