Unraveling Dynamic Trap-State Modulation in Single Core–Crown CdSe/CdS Nanoplatelets

Core-crown CdSe/CdS nanoplatelets combine improved quantum yield with promising optoelectronic performance, yet their emission dynamics remain governed by reversible charge trapping. By correlating single-particle luminescence decays with intensity fluctuations (blinking/flickering), we uncover a distinct emission regime at intermediate brightness levels where delayed luminescence arises. This behavior reflects a reversible trapping process that reduces light emission and introduces a secondary, slow decay channel. Time-resolved analysis reveals stochastic switching between active and inactive reversible trapping within an individual emitter. Under higher excitation powers, these reversible traps are supplanted by stronger nonradiative quenching pathways.