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

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Nano Letters Pub Date : 2025-04-23 DOI:10.1021/acs.nanolett.5c01546

Yi Yang, Jialu Li, Yaobo Li, Binghan Li, Jiancheng Zhang, Zhihao Chen, Liantuan Xiao, Runchen Lai, Zaiping Zeng, Guofeng Zhang, Botao Ji

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Abstract

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.

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强激子约束下近红外InAs胶体量子点的高纯度单光子发射

胶体量子点（QDs）由于其易于与纳米光子元件集成且生产成本低，是量子信息处理中很有前途的固态单光子发射器。然而，基于近红外qds的电信单光子发射器的研究仍然有限。在这里，我们提出了明亮的近红外InAs/InP/ZnSe/ZnS量子点，通过在核心内的强激子约束实现了高纯度的单光子发射。单量子点测量表明，这种约束可以实现超快双激子俄歇复合，抑制多光子的产生，并导致室温下g(2)(0)值低至0.032。与广泛研究的具有准II型带对齐的基于cd的量子点不同，这种量子点在单光子纯度和闪烁抑制之间存在权衡，我们的量子点利用厚绝缘ZnSe外壳，通过屏蔽光生激子免受表面相互作用而最小化光致发光闪烁，而不影响单光子纯度。这项研究为实现近红外量子点稳定、高纯度的单光子发射提供了一种可行的策略，突出了它们作为无重金属量子光源在电信应用中的潜力。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.