WAVELENGTH CONVERSION MATERIAL AND SOLAR CELL SEALING FILM CONTAINING THE SAME

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Provided is a wavelength conversion material composed of resin particles comprising an acrylic resin and an organic rare earth complex contained in the acrylic resin, in which the acrylic resin is obtained from an acrylic resin composition comprising a cross-linking agent, and deterioration of the organic rare earth complex is prevented. A wavelength conversion material composed of resin particles comprising an acrylic resin and an organic rare earth complex contained in the acrylic resin, wherein the acrylic resin is a polymer which is a reaction product of an acrylic resin composition comprising a (meth)acrylate monomer, a crosslinking agent and an azo polymerization initiator, wherein the crosslinking agent is a compound represented by the following formula (I) : where R1 and R2 each independently represent a hydrogen atom or a methyl group and n represents an integer of 2 to 14, and the content of the cross-linking agent is : 0.1 to 5 parts by mass based on 100 parts by mass of the (meth)acrylate monomer when n in formula (I) is 2; or 0.1 to 50 parts by mass based on 100 parts by mass of the (meth)acrylate monomer when n in formula (I) is 3 to 14.