Additionally, TCBPSF exhibits a lifetime with τP values of 1.85 and 0.51 ms in airequilibrated and air-saturated toluene, respectively (Supplementary Figs. ). These dendrimers exhibit short-delayed fluorescence in toluene with low proportions (Supplementary Fig. ). Furthermore, the presence of long phosphorescence is observed in various solutions of these dendrimers (Supplementary Figs. 9-10). These results indicate that the intrinsic RTP exhibited by the dendrimers remains highly stable even in the presence of oxygen when dissolved in solution.