Single Cesium Lead Halide Perovskite Nanocrystals at Low Temperature: Fast Single-Photon Emission, Reduced Blinking, and Exciton Fine Structure.
Single Cesium Lead Halide Perovskite Nanocrystals at Low Temperature: Fast Single-Photon Emission, Reduced Blinking, and Exciton Fine Structure.
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DOI：
10.1021/acsnano.5b07328
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发表时间：
2016-02-23
期刊：
影响因子：
17.1
通讯作者：
Stöferle T
中科院分区：
文献类型：
--
作者：
Rainò G;Nedelcu G;Protesescu L;Bodnarchuk MI;Kovalenko MV;Mahrt RF;Stöferle T
具有钙钛矿晶体结构的金属卤化物半导体由于其易于溶液加工而极具吸引力，并且最近已非常成功地用于高效光伏和明亮光源。在这里，我们表明，在低温下，单胶体铯铅卤化物（CsPbX3，其中 X = Cl/Br）纳米晶体表现出稳定的窄带发射，具有抑制闪烁和小的光谱扩散。光子反聚束展示了明确的非经典单光子发射，辐射衰减约为 250 ps，与其他常见量子发射器相比，呈现出显着的加速。高分辨率光谱可以洞察发射过程的复杂性质，例如精细结构和带电激子动力学。
Metal-halide semiconductors with perovskite crystal structure are attractive due to their facile solution processability, and have recently been harnessed very successfully for high-efficiency photovoltaics and bright light sources. Here, we show that at low temperature single colloidal cesium lead halide (CsPbX3, where X = Cl/Br) nanocrystals exhibit stable, narrow-band emission with suppressed blinking and small spectral diffusion. Photon antibunching demonstrates unambiguously nonclassical single-photon emission with radiative decay on the order of 250 ps, representing a significant acceleration compared to other common quantum emitters. High-resolution spectroscopy provides insight into the complex nature of the emission process such as the fine structure and charged exciton dynamics.