LIGHT-EMITTING MATERIAL, LIGHT-EMITTING INK, LIGHT-EMITTING BODY, AND LIGHT-EMITTING DEVICE

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Disclosed is a light-emitting material including : a substrate that includes a metal oxide and/or a metal sulfide; two or more linker groups bonded to the substrate; a phosphine oxide ligand bonded to each of the linker groups, each phosphine oxide ligand having a single phosphine oxide group; and a rare earth ion. A rare earth complex is formed by a single rare earth ion and two or more phosphine oxide ligands.