| abstract |
The present application relates to a composition comprising a compound having an indole ring structure and a phosphorescence-emitting compound, wherein the compound having an indole ring structure is a polymer comprising a repeating unit which is an indole ring structure represented by the general formula (1-1), (1-2), (1-3), (1-4), (2-1), (2-2), (2-3) or (2-4):n n nwherein R and R 1 each independently represent a hydrogen atom or a monovalent substituent, and when a plurality of R or R 1 are present, they may be the same or different. |