Patent ID: 7858211

Claim:
An organic electroluminescent device, comprising, between a pair of electrodes, at least one organic layer comprising a light-emitting layer comprising a phosphorescent material, wherein the organic electroluminescent device contains at least one compound represented by formula (1A): wherein, in formula (1A), R 21 , R 22 , R 23 , R 24 , R 25 , R 26 , R 27 , R 28 , R 29 , R 30 , R 31 , R 32 , R 33 , R 34 , R 35 , and R 36 each represent a hydrogen atom or a substituent; and at least one of R 21 , R 22 , R 23 , R 24 , R 25 , R 26 , R 27 , R 28 , R 29 , R 30 , R 31 , R 32 , R 33 , R 34 , R 35 , and R 36 is a group having a Hammett σ p value of 0.05 or more.