High-Quality Whispering-Gallery-Mode Lasing from Cesium Lead Halide Perovskite Nanoplatelets
High-Quality Whispering-Gallery-Mode Lasing from Cesium Lead Halide Perovskite Nanoplatelets
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DOI：
10.1002/adfm.201601690
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发表时间：
2016-09-13
影响因子：
19
通讯作者：
Xiong, Qihua
中科院分区：
文献类型：
--
作者：
Zhang, Qing;Su, Rui;Xiong, Qihua
具有高品质因数（Q）和小模态体积的半导体微/纳米腔为探索强光-物质相互作用和量子光学提供了关键平台，从而使相干和量子光子器件的进一步发展成为可能。受激子结合能和热波动的限制，只有ZnO和GaN等少数宽带半导体在室温下具有稳定的激子。具有立方晶格和良好控制的激子的金属卤化物钙钛矿可以提供解决方案。在这项工作中，采用气相范德华外延方法合成了高质量的单晶卤化铯铅CsPbX3（X = Cl，Br，I）回音壁模式（WGM）微腔。生长的钙钛矿在室温下在整个可见光谱范围内表现出强发射和稳定的激子。通过改变卤化物成分，可呈现多种颜色（400-700 nm）。 WGM激子激光在室温下实现，具有低阈值（类似于2.0 mu J cm(-2)）和高光谱相干性（类似于0.14-0.15 nm）。研究结果表明无机钙钛矿有望发展光电器件和量子光学中的强光-物质耦合。
Semiconductor micro/nano-cavities with high quality factor (Q) and small modal volume provide critical platforms for exploring strong light-matter interactions and quantum optics, enabling further development of coherent and quantum photonic devices. Constrained by exciton binding energy and thermal fluctuation, only a handful of wide-band semiconductors such as ZnO and GaN have stable excitons at room temperature. Metal halide perovskite with cubic lattice and well-controlled exciton may provide solutions. In this work, high-quality single-crystalline cesium lead halide CsPbX3 (X = Cl, Br, I) whispering-gallery-mode (WGM) microcavities are synthesized by vapor-phase van der Waals epitaxy method. The as-grown perovskites show strong emission and stable exciton at room temperature over the whole visible spectra range. By varying the halide composition, multi-color (400-700 nm). WGM excitonic lasing is achieved at room temperature with low threshold (similar to 2.0 mu J cm(-2)) and high spectra coherence (similar to 0.14-0.15 nm). The results advocate the promise of inorganic perovskites towards development of opto-electronic devices and strong light-matter coupling in quantum optics.