| abstract |
A compound having a structure represented by the following general formula emits delayed fluorescent light and is useful as a light-emitting material. Three or more of R 1 , R 2 , R 4 , and R 5 each represent a 9-carbazolyl group, a 10-phenoxazyl group, or a 10-phenothiazyl group, and the balance thereof and R 3 each represent a hydrogen atom or a substituent, but exclude a cyano group. R 3 excludes an aryl group, a heteroaryl group, and an alkynyl group. |