To improve the emission efficiency, the driving voltage and the lifetime of an organic light-emitting device using a delayed fluorescent material. A host material for a delayed fluorescent material, containing a compound represented by the following general formula: R1 to R5 each are a substituent not containing a cyano group, n1 to n5 each are 0 to 4, Ar is a monocyclic arylene group or a monocyclic heteroarylene group.
提高使用延迟荧光材料的有机发光器件的发射效率、驱动电压和寿命。一种延迟荧光材料的主材料,含有由以下通式表示的化合物:R1 至 R5 各为不含
氰基的取代基,n1 至 n5 各为 0 至 4,Ar 为单环芳基或单环杂芳基。