The luminous body and the luminous element

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To provide a phosphorescent substance which may consist only of organic compounds without requiring the use of any rare-earth element and can emit afterglow for a long time.SOLUTION : Disclosed is a phosphorescent substance that comprises an electron donor molecule in a stable radical cationic state, and an electron acceptor molecule in a stable radical anionic state. After light irradiation of the phosphorescent substance is stopped, luminescence is observed at 10 K.SELECTED DRAWING : Figure 1