| 摘要 |
An OLED device comprises a cathode, an anode, and located therebetween a light emitting layer containing a compound represented by formula (I): <?in-line-formulae description="In-line Formulae" end="lead"?>Am-M-Bn (I)<?in-line-formulae description="In-line Formulae" end="tail"?> wherein m+n=2 or 3 and neither m nor n is 0; M is Ir, Pt, Os, Ru, Rh, or Pd; Am includes at least one ligand A having a triplet energy of at least 2.9 eV as measured in a homoleptic complex of M and A; and B is represented by the formula (II): wherein Q represents an atomic group forming a nitrogen-containing heterocyclic ring; and R5, R6, R7, R8 and R5' independently represent a hydrogen atom or a substituent.
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