Introduction . Long afterglow materials have broad applications in biological imaging1 , 2 , 3, information encryption4 , 5 , 6and optoelectronic devices7 , 8 , 9, etc., which become the current research hotspot. The traditional superior long afterglow materials are mainly inorganic or organometallic materials10 , 11, but these materials normally suffer from inherent defects, such as monochromatic afterglow, complex preparation process and certain cy...