| abstract |
The present invention provides a light emitting device having high luminous efficiency, low power consumption and low driving voltage by a novel carbazole derivative. A first region containing an acceptor substance and a second region in contact with the first region and located closer to the light emitting layer than the first region are provided between the light emitting layer and the anode, A light emitting device in which the region 2 includes the compound represented by the formula (1) and the second region does not include an acceptor substance. (Wherein, α 1 , α 2 , α 3 and α 4 represent an arylene group having 13 or less carbon atoms forming a ring, and Ar 1 and Ar 2 each represent an aryl having 13 or less carbon atoms forming a ring R 1 represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted biphenyl group, and R 2 represents a group having 1 to 6 carbon atoms Or a substituted or unsubstituted phenyl group or a substituted or unsubstituted biphenyl group, and each of l, m and n is independently 0 or 1.) 【Selection chart】 None |