| abstract |
The present invention provides a condensed ring compound containing two boron atoms and two oxygen atoms, which is represented by formula (I) or formula (II). Compared with the prior art, the present invention adopts a fused-ring compound containing two boron atoms and two oxygen atoms as the light-emitting unit, and on the one hand, the resonance effect between the boron atom and the oxygen atom can be used to realize the separation of HOMO and LUMO. , so as to achieve smaller ΔE ST and TADF effects, and the hybrid fused ring unit of boron atom and oxygen atom has a rigid skeleton structure, which can reduce the degree of structural relaxation of the excited state, thereby achieving a narrower half-peak width; on the other hand Further tuning of the delayed fluorescence lifetime and half-peak width can also be achieved by introducing different substituents on the backbone of the fused ring unit. |