High-Purity Single-Photon Emission in Near-Infrared InAs Colloidal Quantum Dots with Strong Exciton Confinement

作者：Yi Yang, Jialu Li, Yaobo Li, Binghan Li, Jiancheng Zhang, Zhihao Chen, Liantuan Xiao, Runchen Lai, Zaiping Zeng, Guofeng Zhang, Botao Ji · 发表于：Nano Letters · 年份：2025 · DOI：10.1021/acs.nanolett.5c01546 · 被引用次数：7 · 研究领域：Quantum Dots Synthesis And Properties、Chalcogenide Semiconductor Thin Films、Nonlinear Optical Materials Studies

Colloidal quantum dots (QDs) are promising solid-state single-photon emitters for quantum information processing due to their facile integration with nanophotonic components and cost-effective production. However, research on near-infrared QDs-based single-photon emitters for telecommunications remains limited. Here, we present bright near-infrared InAs/InP/ZnSe/ZnS QDs that achieve high-purity single-photon emission through strong exciton confinement within the core. Single-QD measurements reveal that this confinement enables ultrafast biexciton Auger recombination, suppressing multiphoton generation and resulting in g (2) (0) values as low as 0.032 at room temperature. Unlike extensively studied Cd-based QDs with quasi-type II band alignment, which suffer from a trade-off between single-photon purity and blinking suppression, our QDs leverage a thick insulating ZnSe shell to minimize photoluminescence blinking by shielding photogenerated excitons from surface interactions without compromising single-photon purity. This study offers a viable strategy for achieving stable, high-purity single-photon emission in near-infrared QDs, highlighting their potential as heavy-metal-free quantum light sources for telecommunications applications.