| abstract |
The invention discloses a compound with a dibenzo six-membered ring as the core and its application in an organic electroluminescence device. One of the branched chains of the compound is phenyl, biphenyl or naphthyl, and the other two are The bars are aza five-membered rings. The compound of the present invention has high glass transition temperature and molecular thermal stability; low absorption and high refractive index in the visible light field; after being applied to the CPL layer of the OLED device, the light extraction efficiency of the OLED device can be effectively improved; the compound of the present invention also With shallow HOMO energy level and high hole mobility, it can be used as a hole injection/transport layer material for OLED devices, which can effectively transfer holes to the side of the light-emitting layer, thereby improving the efficiency of holes and electrons in the light-emitting layer. The recombination efficiency of the OLED device can be improved, and the luminous efficiency and service life of the OLED device can be improved. |