Compound taking quinazolinone as core and applications of compound on OLED

The invention discloses a compound taking quinazolinone as a core and applications of the compound on OLED. The compound takes quinazolinone as a core and has the characteristics that molecules are difficult to crystalize and aggregate and the film forming property is good. When the compound is used as a main body material of a luminescent layer of an OLED, the current efficiency, power efficiency and external quantum efficiency of the device can be greatly improved; and in addition, the service life of the device can be obviously prolonged.