PHOSPHORESCENT SUBSTANCE AND PHOSPHORESCENT ELEMENT

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PROBLEM TO BE SOLVED : 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 COPYRIGHT : (C)2019, JPO&INPIT