Afterglow brightness upon ceasing excitation represents an important parameter for afterglow material applications, while purely-organic room-temperature afterglow materials with high quantum yields, long emission lifetimes and strong absorption capability which are necessary to realize high afterglow brightness remain rarely reported. Using dopant-matrix collaboration, TADF mechanism and spiro molecular design, here we report a highly bright afterglow system that possesses persistent luminescence quantum yields as high as 30% and emission lifetimes up to 0.6 s at ambient conditions by doping spiro-shaped difluoroboron β-diketonate (spiroBF2, ε= 6.5×104 M-1cm-1) luminogens into benzophenone (BP) matrices. After being processed into desired shapes and large-area panels by melt casting, the spiroBF2-BP material exhibits intense green afterglow that is much brighter than a typical SrAl2O4: Eu2+, Dy3+ inorganic afterglow material and can last for more than 5 s under room light, which is among the brightest afterglow in purely-organic systems.

Achieving High Afterglow Brightness in Organic Dopant-Matrix Systems

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