| abstract |
The present invention relates to an organic electroluminescent material characterized by dihydrotriphenanthridine and benzoazepine heterocycle and its application. The organic electroluminescent material is a derivative of dihydrotriphenanthridine. The disubstituted aryl group of no more than two benzene rings, and then connected to the benzazepine heterocyclic ring is formed, and the specific structure is as follows: Wherein, X is an oxygen atom or a 2-substituted malononitrile, Ar is a disubstituted aryl group containing no more than two benzene rings, and Y is a benzazepine ring. This type of organic electroluminescent material characterized by dihydrotriphenanthridine and benzazepine heterocycles has suitable molecular weight, high glass transition temperature, intermolecular crystallization or aggregation, and good film-forming stability. ; This type of organic electroluminescent material characterized by dihydrotriphenanthridine and benzoazepine heterocycles has high absorption in the ultraviolet region, low absorption in the visible region, and high optical refractive index. It is used in the CPL layer of OLED devices. After that, the light extraction efficiency of the OLED device can be significantly improved. |