Supplement Number 1

See the supplementary material for additional details on experimental methods, performance and spectrum of the TAPC emitter-based OLEDs (Fig. S1), nanosecond time-resolved transient absorption spectra (Fig. S2), femtosecond time-resolved transient absorption spectra (Fig. S3), PL spectra at varied FLT treatment time with different structures (Fig. S4, Fig. S5 and Fig. S6), excitation power-dependent PL spectra (Fig. S7), the ultraviolet visible absorption spectroscopy (Fig. S8), the derivation of the excitation-power dependence of the photoluminescence in organic semiconductors (Note S1), the variation trends of different functions in the double-logarithmic plot of L versus I (Fig. S9), picture of the encapsulated TAPC and the PL spectra at varied aging time of TAPC with FLT (Fig. S10).