D'Amato Marianna, Fu Ningyuan, Glorieux Quentin, Giacobino Elisabeth, Le Jeannic Hanna, Ithurria Sandrine, Lhuillier Emmanuel, Bramati Alberto
Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-PSL Research University, Collège de France, 4 place Jussieu, 75252 Paris, Cedex 05, France.
Laboratoire de Physique et d'Étude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université, CNRS, 10 rue Vauquelin, 75005 Paris, France.
ACS Nano. 2025 Apr 15;19(14):14404-14409. doi: 10.1021/acsnano.5c01971. Epub 2025 Apr 1.
In the search for materials for quantum information science applications, colloidal semiconductor nanoplatelets (NPLs) have emerged as a highly promising class of materials due to their interesting optical properties, such as narrow emission line widths and fast photoluminescence (PL) lifetimes at room temperature. So far, only a few works focused on the quantum properties of their emission; however, NPLs, with their atomic-scale thickness and one-dimensional quantum confinement, are promising candidates for single-photon sources. Here, we demonstrate room-temperature single-photon emission from core/shell CdSe/ZnS NPLs, which feature an 8 × 20 nm surface area and 1 nm shell. The limited surface area ensures effective Auger nonradiative recombination, resulting in highly efficient single-photon generation with values of photon purity as low as (0) = 0.04. The observed long-period blinking and bleaching typical of such thin shells can be easily reduced by increasing the shell thickness. This work establishes NPLs as single-photon sources that are very well suited for integration into quantum photonic systems.
在寻找用于量子信息科学应用的材料时，胶体半导体纳米片（NPLs）因其有趣的光学特性，如窄发射线宽和室温下快速的光致发光（PL）寿命，已成为一类极具潜力的材料。到目前为止，只有少数研究关注其发射的量子特性；然而，具有原子级厚度和一维量子限制的NPLs是单光子源的有前途的候选者。在这里，我们展示了核/壳CdSe/ZnS NPLs在室温下的单光子发射，其表面积为8×20 nm，壳层厚度为1 nm。有限的表面积确保了有效的俄歇非辐射复合，从而产生了高效的单光子，光子纯度低至(0)=0.04。通过增加壳层厚度，可以很容易地减少这种薄壳典型的长周期闪烁和漂白现象。这项工作将NPLs确立为非常适合集成到量子光子系统中的单光子源。
