Two-Photon-Pumped Perovskite Semiconductor Nanocrystal Lasers

详细信息    查看全文

• 作者：Yanqing Xu ; Qi Chen ; Chunfeng Zhang ; Rui Wang ; Hua Wu ; Xiaoyu Zhang ; Guichuan Xing ; William W. Yu ; Xiaoyong Wang ; Yu Zhang ; Min Xiao
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：March 23, 2016
• 年：2016
• 卷：138
• 期：11
• 页码：3761-3768
• 全文大小：493K
• ISSN：1520-5126

文摘

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 × 10⁶ 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.