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US09590194B2 Organic electroluminescent materials and devices 有权
有机电致发光材料和器件

Organic electroluminescent materials and devices
Abstract:
The present invention relates to metal complexes having novel ligands. The compounds are useful in organic light emitting devices (OLEDs), particularly as emitting dopants. The incorporation of these novel ligands provides red phosphorescent materials with good external quantum efficiency, good color, and long lifetime.
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