Rare earth complex and light emitting element

A rare earth complex comprising:

• a rare earth ion;
• and
• a ligand coordinated with the rare earth ion and having a condensed polycyclic aromatic group,
• wherein the condensed polycyclic aromatic group is a residue formed by removing a hydrogen atom bonded to a condensed aromatic ring in the following formula (I) or formula (II) from a condensed polycyclic aromatic compound represented by formula (I) or (II), and
• the condensed polycyclic aromatic compound optionally has a substituent bonded to the condensed aromatic ring in formula (I) or formula (II),
• wherein the ligand having the condensed polycyclic aromatic group is a phosphine oxide ligand having one phosphine oxide group and represented by the following formula (10):
• wherein in formula (10), Z represents the condensed polycyclic aromatic group and R11 and R12 each independently represent an aryl group different from the condensed polycyclic aromatic group, and
• the rare earth complex further comprises a diketone ligand represented by the following formula (21) and coordinated with the rare earth ion:
• wherein R23, R24 and R25 each independently represent a hydrogen atom, an alkyl group, a halogenated alkyl group, an aryl group different from the condensed polycyclic aromatic group, or a heteroaryl group.