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Provided are light-emitting materials containing rare earth complex nanocrystals. The nanocrystals of the rare earth complex are preferably dispersed or suspended, and light emission efficiency is improved by using the rare earth complex in the form of crystals, and in the form of nanocrystals, in particular. A high level of light emission can be obtained, even with extremely weak exciting light by exciting such light-emitting materials with ultraviolet light. Thus, the light emission efficiency of the rare earth complex can be improved, and light-emitting materials with excellent light emission efficiency can be developed.