Light-emitting material comprising orthometalated iridium complex, light-emitting device, high efficiency red light-emitting device, and novel iridium complex
A compound represented by following formula (23): n nwherein R 11 and R 12 each represents a substituent; R 13 , R 14 and R 15 each represents a hydrogen atom or a substituent; m 1 represents an integer of from 0 to 4; and m 2 represents an integer of from 0 to 6.