Light-emitting material

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PROBLEM TO BE SOLVED : To provide a rare earth luminescent complex that can be dissolved in a solvent at high concentration to enable high luminous efficiency, and also has small interaction with a solvent to facilitate luminous design.SOLUTION : In a rare earth luminescent complex, phen and hfa are coordinated at the rate of 1 : 3 in a rare earth element X represented by the following formula 1.