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Organic luminescent materials with room-temperature phosphorescence(RTP)have recently gained increasing attention because of their long-lived triplet excitons which make them useful for high-efficiency displays,sensing and imaging.Although persistent RTP(pRTP)emission has been observed for a few pure crystalline organic molecules,there is no consistent mechanism and no universal design strategy for organic pRTP materials.A new mechanism for pRTP is presented,based on combining the advantages of different excited-state configurations in electronic coupled intermolecular units,which may be applicable to a wide range of organic molecules.