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 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 acrylic resin composition is substantially free of an organic peroxide having a group represented by R—C(═O)O— where R represents a hydrocarbon group that may be optionally substituted, as a polymerization initiator, and the acrylic resin composition comprises an organic peroxide having a one-minute half-life temperature of 145° C. or less as another polymerization initiator.