| abstract |
The invention provides a condensed ring compound containing boron atom and selenium/tellurium atom, as shown in formula (I). Compared with the prior art, the present invention uses a boron/selenium (tellurium) hybrid fused ring unit as a luminescent material, and can utilize the resonance effect between boron atoms and selenium (tellurium) atoms to realize the separation of HOMO and LUMO, thereby realizing a relatively Small ΔE ST and TADF effects, while the boron/selenium (tellurium) hybrid fused ring unit has a rigid skeleton structure, which can reduce the degree of relaxation of the excited state structure, thereby achieving a narrower half-width; and the compound can be obtained by introducing selenium Or tellurium atoms and different substituents can achieve further adjustment of the half-height width. Experimental results show that using the fused ring compound of the present invention as the light-emitting layer of an electroluminescent device can not only realize a narrow half-peak width of electroluminescence without a filter and a microcavity structure, but also realize a high device external quantum efficiency. |