| abstract |
The present invention relates to the field of OLED technology, and provides a light-emitting host material comprising an adamantane structure, which has a structure shown in formula ( I ); L and L are each independently selected from a single bond, phenyl, naphthyl etc.; electron donor D is mainly selected from carbazolyl and its derivatives, diphenylamino and its derivatives, acridine and its derivatives; electron acceptor A is mainly selected from nitrogen-containing heterocycles Class substituents, cyano-containing substituents, triarylboron substituents. The D-(π)-σ-(π)-A structure in the compound of the present invention has bipolarity, and the middle σ bond can effectively break the charge transfer between the electron donor D and the electron acceptor A, so that the excitation The state is confined to a localized excited state within a segment of electron donor D or electron acceptor A, thus giving the compound a small excited state dipole moment. When it is used as the host material of the light-emitting layer of the OLED device, it can effectively reduce the efficiency roll-off of the blue light material, and improve the luminous brightness and luminous efficiency. |