| 摘要 |
An electroluminescence device having a layer containing a specific metal coordination compound is provided. The metal coordination compound is represented by formula (1) below: <?in-line-formulae description="In-line Formulae" end="lead"?>ML<SUB>m</SUB>L'<SUB>n</SUB> (1), <?in-line-formulae description="In-line Formulae" end="tail"?> wherein M is a metal atom of Ir, Pt, Rh or Pd; L and L' are mutually different bidentate ligands; m is 1, 2 or 3 and n is 0, 1 or 2 with the proviso that m+n is 2 or 3; a partial structure MLm is represented by formula (2) shown below and a partial structure ML'<SUB>n </SUB>is represented by formula (3) or (4) shown below: at least one of the optional substituent(s) of the cyclic groups, and the cyclic groups CyC<SUB>1 </SUB>and CyC2 include an aromatic group capable of having a substituent represented by the following formula (5): The metal coordination compound having the aromatic group is effective in providing high-efficiency luminescence and long-term high luminance.
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