Patent ID: 7037598
Filing Date: 2006-05-02
Classification: C07F,H01L,Y10S

Abstract:
1. A light-emitting element comprising: a pair of electrodes; and at least one organic compound layer comprising a light-emitting layer provided between the electrodes, the light-emitting layer comprising at least one compound represented by the formula (1): wherein R 11 represents a substituent, R 12 represents a hydrogen atom or a substituent, Y 11 represents a substituted or unsubstituted nitrogen atom or a substituted or unsubstituted carbon atom, Z 11 represents a linking group, M 11 represents a transition metal ion, L 11 represents a ligand, X 11 represents a counter ion, a bond between Y 11 and a nitrogen atom is a single bond or a double bond, a bond between R 11 and the nitrogen atom is a single bond or a double bond, n 11 represents 0 or 1, n 12 represents 0 or 1, provided that when n 12 is 0, Y 11 and R 11 may be linked together to form a nitrogen-containing hetero ring, m 11 represents an integer of 1 to 3, m 12 represents an integer of 0 to 8, and m 13 represents an integer of 0 to 3, with at least one electron-withdrawing group being contained in the compound represented by the formula (1), wherein the light-emitting layer comprises a host compound and the compound represented by the formula (1), and the host compound has an energy level of a lowest triplet excited state (T wherein a layer adjacent to the light-emitting layer comprises a compound having an energy level of a lowest triplet excited state (T