Organic scintillators exhibit inherent advantages, such as abundant resources, high mechanical flexibility, easy processing, low cost and large-area fabrication, and have received much attention in recent years due to their potential applications in radiation detection, high-energy physics, medical radiography, security screening and astronomical discovery . To develop efficient organic scintillators, some key parameters are required to be implemented, including (i) the short radiative lifetime (< 10 ns) enables quickly dynamic X-ray imaging and medical diagnosis ; (ii) the narrow full-width at half-maximum (FWHM) (< 60 nm) radioluminescence (RL) reduces scattering effects and improves the clarity and accuracy of imaging 7 ; (iii) the large Stokes shift (> 100 nm) reduces self-absorption of X-ray sources and ensures the full utilization of excitation energy. ; and (iv) the high photoluminescence quantum efficiency (PLQY) (> 90%) is closely related to the high conversion efficiency of scintillators from X-ray to luminescence . Traditional organic scintillators with strong absorption bands, such as anthracene , exhibit strong emission due to the large overlap of electron-hole wave functions in the singlet locally excited (LE) state (Fig. ).