Optically bright lead halide perovskite nanocrystals of different morphologies ranging from nanocubes to flat nanoplatelets to elongated nanowires have been reported. The morphology of the nanocrystals is expected to affect various properties such as the band edge energy and the electron-hole exchange interaction. However, aside from nanocubes, the investigation of optical properties in the lead halide perovskite nanocrystals of different morphologies at the single emitter level has been lacking. We have performed optical spectroscopy in single CsPbBr3 nanoplatelets and observed single photon emission without blinking. Furthermore, the photoluminescence emission exhibits excitonic fine structure peaks similar to what has been previously observed in nanocubes. Our work stimulates further investigations into the excitonic and quantum optics properties when the lateral size and morphology can be further controlled in lead halide perovskite nanocrystals.

中文翻译：

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单胶体CsPbBr3钙钛矿纳米片的光谱学。

已经报道了从纳米立方体到扁平纳米片再到细长纳米线的不同形态的光学上明亮的卤化钙钛矿型纳米晶。预期纳米晶体的形态会影响各种性质，例如带边缘能和电子-空穴交换相互作用。然而，除了纳米立方体之外，还缺乏在单发射体水平上对具有不同形态的卤化钙钛矿铅纳米晶体的光学性质的研究。我们已经对单个CsPbBr3纳米血小板进行了光谱分析，并观察到单光子发射而没有闪烁。此外，光致发光发射显示出与先前在纳米立方体中观察到的相似的激子精细结构峰。