| abstract |
The invention relates to an organic compound with fluorene as the core, its preparation method and its application in organic electroluminescent devices. The structure of the compound is that fluorene is connected with a dibenzo five-membered ring structure through a carbon-carbon bond , the carbon-carbon bond connection not only improves the chemical stability of the material but also avoids the exposure of the active position of the branched chain group, and the whole molecule is a relatively large rigid structure with a high triplet state energy level (T1); and the steric hindrance is large , is not easy to rotate, and the three-dimensional space structure is more stable, so the compound has a higher glass transition temperature and molecular thermal stability; in addition, the HOMO and LUMO distribution positions of the compound of the present invention are separated from each other, so that it has a suitable HOMO and LUMO energy level ; Therefore, after the compound of the present invention is applied to an OLED device, it can effectively improve the luminous efficiency and service life of the device. |