CdTe0.25Se0.75 Quantum Dots Showed Efficient Room-Temperature Single Photon Emission

IF 4.6 2区化学 Q2 CHEMISTRY, PHYSICAL

The Journal of Physical Chemistry Letters Pub Date : 2025-06-05 DOI:10.1021/acs.jpclett.5c00884

Kush Kaushik, Jiban Mondal, Ritesh Kumar Bag, Shagun Sharma, Abdul Salam, Chayan Kanti Nandi

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Abstract

Room-temperature single photon sources (SPS) are crucial for developing next-generation quantum technologies. Quantum dots (QDs) have recently been reported as promising materials for SPS at room temperature. Our study highlights a new mechanism to enhance single photon emission through trap state-assisted enhancement in single photon emission purity by optimizing the single particle optical properties of a series of water-soluble CdTe_xSe_1–x QDs. We achieved an efficient SPS in CdTe_0.25Se_0.75 QDs with a second-order photon correlation value (g²(0)) as low as 0.02. They also exhibited deterministic emissions, with some QDs exhibiting ON time exceeding 95% of the total time. This was accompanied by an increased photon count rate, substantially reduced blinking events, and extended single particle ON-time. The increased single photon emission with enhanced ON time is attributed to simultaneous electron and hole trapping to dense trap states, which encourages the single photon emission for a long time.

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CdTe0.25Se0.75量子点表现出高效的室温单光子发射

室温单光子源（SPS）对于下一代量子技术的发展至关重要。量子点（QDs）最近被报道为室温SPS的有前途的材料。我们的研究强调了通过优化一系列水溶性CdTexSe1-x量子点的单粒子光学性质，通过阱态辅助提高单光子发射纯度来增强单光子发射的新机制。我们在CdTe0.25Se0.75量子点中实现了高效的SPS，其二阶光子相关值（g2(0)）低至0.02。它们还表现出确定性的发射，一些量子点的ON时间超过总时间的95%。这伴随着光子计数率的增加，大大减少了闪烁事件，延长了单粒子的on时间。单光子发射随ON时间的增加而增加，这是由于电子和空穴同时被捕获到密集的陷阱态，从而促进了单光子的长时间发射。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

The Journal of Physical Chemistry Letters CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY

CiteScore

9.60

自引率

7.00%

发文量

1519

审稿时长

1.6 months

期刊介绍： The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.