Two-Photon-Pumped Perovskite Semiconductor Nanocrystal Lasers
Two-Photon-Pumped Perovskite Semiconductor Nanocrystal Lasers
复制标题
双光子泵浦钙钛矿半导体纳米晶体激光器
DOI：
10.1021/jacs.5b12662
复制
发表时间：
2016-03-23
影响因子：
15
通讯作者：
Xiao, Min
中科院分区：
文献类型：
--
作者：
Xu, Yanqing;Chen, Qi;Xiao, Min
双光子泵浦激光器被认为是一种很有前途的策略，以实现频率上转换的情况下，传统的方法所需的相位匹配的条件不能满足。然而，它们的实际应用受到了缺乏既具有有效双光子吸收又易于实现粒子数反转的材料的阻碍。在这里，我们表明，这一挑战可以通过采用钙钛矿半导体的胶体纳米晶体来解决。我们在CsPbBr 3纳米晶体的甲苯溶液中观察到高效的双光子吸收（截面为2.7 × 10（6）GM），其可以在薄膜中激发大的光学增益（>500 cm（-1））。我们通过将CsPbBr 3纳米晶体与微管谐振器耦合，成功地在极低的阈值下实现了稳定的双光子泵浦激光。我们的研究结果表明，钙钛矿纳米晶体可以作为优良的增益介质，高性能的频率上转换激光器走向实际应用。
Two-photon-pumped lasers have been regarded as a promising strategy to achieve frequency up-conversion for situations where the condition of phase matching required by conventional approaches cannot be fulfilled. However, their practical applications have been hindered by the lack of materials holding both efficient two-photon absorption and ease of achieving population inversion. Here, we show that this challenge can be tackled by employing colloidal nanocrystals of perovskite semiconductors. We observe highly efficient two photon absorption (with a cross section of 2.7 X 10(6) GM) in toluene solutions of CsPbBr3 nanocrystals that can excite large optical gain (>500 cm(-1)) in thin films. We have succeeded in demonstrating stable two-photon-pumped lasing at a remarkable low threshold by coupling CsPbBr3 nanocrystals with microtubule resonators. Our findings suggest perovskite nanocrystals can be used as excellent gain medium for high-performance frequency-up-conversion lasers toward practical applications.