| 摘要 |
Disclosed is an OLED device comprising a non-gallium host compound and a green light emitting dopant wherein the dopant comprises an N,N'-diarylquinacridone compound optionally containing on the two aryl groups and the quinacridone nucleus only substituent groups having Hammett's sigma constant values at least 0.05 more positive than that for a corresponding methyl group, such substituent groups including up to two substituent groups directly on the carbon members of the quinacridone nucleus, provided that said substituent groups do not form a ring fused to the five-ring quinacridone nucleus. Such a device exhibits improved stability, and at the same time, provides high efficiency and good color.
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