Organoboron fused ring compound as well as preparation method and application thereof

The invention provides an organoboron fused ring compound as well as a preparation method and application thereof. The organic fused ring compound can be used in an organic electroluminescent device, on one hand, the relaxation degree of an excited state structure can be reduced by using a rigid skeleton structure of the fused ring compound, so that a relatively narrow half-peak width is realized; on the other hand, a carbazole unit is bonded to a rigid framework of the fused ring compound through a carbon-nitrogen bond and a carbon-carbon bond to form a symmetric structure or an asymmetric structure, a hole trap is inhibited from being formed between the host material and the fluorescent material by reducing the HOMO energy level, and the luminous efficiency and stability of the device are improved. Meanwhile, through the steric hindrance effect of carbazole elements, a dihedral angle with a planar molecular skeleton is increased, self-aggregation is inhibited, and solubility is improved. Tests show that the