FLUORESCENT BODY, WAVELENGTH CONVERSION MEMBER, AND PHOTOVOLTAIC DEVICE

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A phosphor of the present invention has a crystal structure in which at least one of Ce3+ and Eu2+ is substituted for a part of a host crystal that contains at least one of an alkaline earth metal element and a rare earth element and does not contain an alkaline metal element. In the phosphor, a light emission spectrum measured at room temperature has a light emission peak, which is derived from at least one of Ce3+ and Eu2+, within a wavelength range of 440 nm or more to less than 1200 nm, the light emission peak indicates a maximum intensity value of the light emission spectrum, and a refractive index is 1.41 or more to less than 1.57.