Composition for forming wavelength conversion film

As a composition for forming a wavelength conversion film that forms a wavelength conversion film having excellent wavelength conversion efficiency and durability, provided is a composition for forming a wavelength conversion film that contains (A) a phosphor represented by formula (1) and (B) a binder. (In the formula, Ar1 and Ar2 are each independently an optionally substituted aromatic ring, R1 and R2 are each independently a hydrogen atom, an optionally substituted alkyl group, an optionally substituted cycloalkyl group, an optionally substituted aryl group, or an optionally substituted heteroaryl group, R1 and R2 may be bonded to each other so as to form a ring together with an adjacent nitrogen atom, and R1 and R2 are each independently a hydrogen atom, an optionally substituted alkyl group, an optionally substituted cycloalkyl group, an optionally substituted aryl group, or an optionally substituted heteroaryl group. Either or both of R1 and R2 may be bonded to Ar2 to form a ring together with an adjac