Role of the Exciton-Polariton in a Continuous-Wave Optically Pumped CsPbBr3 Perovskite Laser
Role of the Exciton-Polariton in a Continuous-Wave Optically Pumped CsPbBr3 Perovskite Laser
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激子极化子在连续波光泵浦 CsPbBr3 钙钛矿激光器中的作用
DOI：
10.1021/acs.nanolett.0c02462
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发表时间：
2020-09-09
期刊：
影响因子：
10.8
通讯作者：
Zhang, Qing
中科院分区：
文献类型：
--
作者：
Shang, Qiuyu;Li, Meili;Zhang, Qing
卤化铅钙钛矿已成为用于可溶液加工和柔性激光器的优良光学增益材料。最近，连续波（CW）光驱动激光在钙钛矿晶体中建立，然而，低阈值操作的机制仍然存在争议。在这项研究中，连续泵浦激光从一维CsPbBr 3纳米带（NB）的阈值为130 W cm（-2），这可以归因于大的折射率激子极化激元（EP）效应。升高温度会降低EP的激子分数，从而降低群折射率和相折射率，并抑制100 K以上的激光。热管理，包括将NB高度降低到近似120 +/- 60 nm，并采用高导热性散热器，例如，蓝宝石对于CW驱动的激光是至关重要的，即使在低温下也是如此。这些结果揭示了CsPbBr 3超低阈值激光的本质，并为室温CW和电驱动钙钛矿宏/微激光器的构建提供了见解。
Lead halide perovskites have emerged as excellent optical gain materials for solution-processable and flexible lasers. Recently, continuous-wave (CW) optically driven lasing was established in perovskite crystals; however, the mechanism of low-threshold operation is still disputed. In this study, CW-pumped lasing from one-dimensional CsPbBr3 nanoribbons (NBs) with a threshold of similar to 130 W cm(-2) is demonstrated, which can be ascribed to the large refractive index induced by the excitonpolariton (EP) effect. Increasing the temperature reduces the exciton fraction of EPs, which decreases the group and phase refractive indices and inhibits lasing above 100 K. Thermal management, including reducing the NB height to similar to 120 +/- 60 nm and adopting a high-thermal-conductivity sink, e.g., sapphire, is critical for CW-driven lasing, even at cryogenic temperatures. These results reveal the nature of ultralow-threshold lasing with CsPbBr3 and provide insights into the construction of room-temperature CW and electrically driven perovskite macro/microlasers.