The invention belongs to the technical field of organic photoelectric materials, and relates to a polycyclic aromatic compound serving as electroluminescence and a luminescence apparatus thereof. Thepolycyclic aromatic compound has a molecular structure as shown in formula (1): (shown in the description). According to the polycyclic aromatic compound provided by the invention, small conjugated aromatic rings are connected by virtue of elements or groups such as boron and phosphorus to form a polycyclic aromatic compound. The small conjugated ring system is connected by adopting a non-carbon bridge group, so that the strong conjugated interaction among multiple rings can be reduced, the delocalization degree of HOMO and LUMO can be inhibited, the energy difference of HOMO-LUMO cannot be reduced, and the T1 energy grade is not too low; and therefore, the compound has large HOMO-LUMO energy difference, and can emit high-quality blue, skyblue and dark-blue light.