| 摘要 |
Disclosed is a composition comprising: a compound having a residue of at least one nitrogenated compound selected from the group consisting of nitrogenated compounds represented by formulae (1-1), (1-2), (1-3) and (1-4) [wherein R's independently represent a hydrogen atom or a substituent and may be the same as or different from one another] and a residue of at least one nitrogenated polycyclic compound selected from the group consisting of nitrogenated polycyclic compounds represented by formulae (2-1), (2-2), (2-3) and (2-4) [wherein R's are as defined above]; and a phosphorescent light-emitting compound.
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