| abstract |
The present invention relates to a light emitting device having a partial structure ML m represented by the following formula (2), and preferably having a layer containing a metal coordination compound represented by the following formula (3) as a whole.n n n <Formula 3>n n n ML m L ' n n n n Wherein M is a metal atom of Ir, Pt, Rh or Pd, L and L 'represent bidentate ligands different from each other, m is 1, 2 or 3, n is 0, 1 or 2, provided that M + n is 2 or 3, and the partial structure ML m represents the following general formula (2), wherein B represents an isoquinolyl group bonded to the metal M by N, and the cyclic group A bonded to the carbon atom at its 1-position is C Bound to the metal M), and the partial structure ML ' n is represented by the following formula (4), (5) or (6). It is possible to obtain a light emitting device suitable for red light emission while maintaining high brightness for a long time with high efficiency light emission.n n n <Formula 2>n n n n n n n n <Formula 4>n n n n n n n n <Formula 5>n n n n n n n n <Formula 6>n n n n n n n n n Metal coordination compound, organic light-emitting device, red light emission |