| abstract |
The invention discloses a compound with dibenzocycloheptene as the central skeleton and its application in organic electroluminescence devices. The compound has strong rigidity because it contains a spirobenzocycloheptene ring structure. Moreover, after connecting the long branched structure of the five-membered ring and the ring derivative, the compound has the characteristics of not easy to crystallize between molecules, not easy to aggregate, and good film-forming properties; the branched chain of the compound of the present invention is an electron donating group, and the group donates electrons The strength of the ability is different, so the HOMO energy level of the material is different, and it can be used as a material for different functional layers; in addition, the compound of the present invention has a higher triplet energy level, which can effectively block energy loss and facilitate In terms of energy transfer, after the compound of the present invention is applied to an OLED device as an organic electroluminescence functional layer material, the current efficiency, power efficiency and external quantum efficiency of the device are greatly improved; at the same time, the life of the device is significantly improved. |