Nonblinking Colloidal Quantum Dots via Efficient Multiexciton Emission

Nonblinking colloidal quantum dots (QDs) are significant to their applications as single-photon sources or light-emitting materials. Herein, a simple heat-up method was developed to synthesize high-qualityWZ-CdSe/CdS core-shell colloidal QDs, which achieved a near-unity photoluminescence quantum yield (PLQY). It was found that the blinking behavior of such QDs was completely suppressed at high excitation intensities, and ultra-stable PL emission was observed. For this reason, a systematic investigation was conducted, revealing that the complete blinking suppression was attributed mainly to the efficient multiexciton emission at high excitation intensities. Such high-quality QDs with nonblinking behaviors and nearly ideal PL properties at high excitation intensities have massive potential applications in various robust conditions, including QD display screens, single-particle tracks, and single-photon sources.

Automated summary

A simple heat-up method was developed to synthesize high-quality WZ-CdSe/CdS core-shell colloidal quantum dots with nonblinking behaviors and nearly ideal photoluminescence properties. It was found that the complete blinking suppression of the quantum dots at high excitation intensities was mainly attributed to efficient multiexciton emission.