Xie Mingcai, Tao Chen-Lei, Zhang Zhen, Liu Hanyu, Wan Sushu, Nie Yan, Yang Weiqing, Wang Xiaoyong, Wu Xue-Jun, Tian Yuxi
Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.
State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.
J Phys Chem Lett. 2022 Mar 17;13(10):2371-2378. doi: 10.1021/acs.jpclett.2c00378. Epub 2022 Mar 7.
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-quality-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.
不闪烁的胶体量子点（QDs）对于其作为单光子源或发光材料的应用具有重要意义。在此，开发了一种简单的加热方法来合成高质量的CdSe/CdS核壳胶体量子点，其实现了接近单位的光致发光量子产率（PLQY）。发现此类量子点的闪烁行为在高激发强度下被完全抑制，并观察到超稳定的PL发射。因此，进行了系统研究，揭示完全的闪烁抑制主要归因于高激发强度下的高效多激子发射。这种具有不闪烁行为且在高激发强度下具有近乎理想PL特性的高质量量子点在各种稳健条件下具有大量潜在应用，包括量子点显示屏、单粒子轨迹和单光子源。
