Composition, layer including the composition, light-emitting device including the composition, and electronic apparatus including the light-emitting device

A composition, comprising a first compound represented by Formula 1 and a second compound represented by Formula 2:

• Ir(L11)n11(L12)n12(L13)n13 Formula 1
• Ir(L21)n21(L22)n22(L23)n23 Formula 2
• wherein, in Formulae 1 and 2,
• L11, L12, L13, L21, L22, and L23 are each independently:
• i) a bidentate ligand bonded to iridium of Formula 1 via two nitrogen atoms, or a bidentate ligand bonded to iridium of Formula 2 via two nitrogen atoms,
• ii) a bidentate ligand bonded to iridium of Formula 1 via a nitrogen atom and a carbon atom, or a bidentate ligand bonded to iridium of Formula 2 via a nitrogen atom and a carbon atom, or
• iii) a bidentate ligand bonded to iridium of Formula 1 via two carbon atoms, or a bidentate ligand bonded to iridium of Formula 2 via two carbon atoms,
• L11, L12, and L13 are different from one another,
• n11 and n12 are each independently 1 or 2,
• n13 is 0 or 1,
• a sum of n11, n12, and n13 is 3,
• L21, L22, and L23 are different from one another,
• n21 and n22 are each independently 1 or 2,
• n23 is 0 or 1,
• a sum of n21, n22, and n23 is 3, and
• L11 and L21 are different from each other.