| abstract |
A thermally excited delayed fluorescent host material based on phosphine heteroaryl derivatives and its preparation method and application, which relate to a thermally excited delayed fluorescent host material and its preparation method and application. It aims to solve the technical problem that the existing planar heat-excited delayed fluorescent dye molecules are prone to quenching, resulting in low device efficiency. The structural formula of the thermally excited delayed fluorescent host material of the present invention is: Preparation method: Add o-dibromoaryl compound, phenylphosphine dichloride, and n-butyllithium into tetrahydrofuran, mix well, react under the protection of argon, then pour into water, extract with dichloromethane to obtain organic layer, after drying, directly purify or purify after sulfuration/and oxidation to obtain a thermally excited delayed fluorescence host material based on phosphine heteroaryl derivatives; wherein the o-dibromoaryl compound is o-dibromobenzene or 2,3-di bromonaphthalene. The fluorescent host material based on the phosphine heteroaryl derivative is used in thermal excitation delayed fluorescence electroluminescent devices. |