title: Two-Photon-Pumped Perovskite Semiconductor Nanocrystal Lasers.
abstract: 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 × 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.
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
authors.forename: Yanqing
authors.initials: Y
authors.lastname: Xu
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Chen
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.|Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei, Anhui 230026, China.
authors.forename: Chunfeng
authors.initials: C
authors.lastname: Zhang
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Wang
authors.affiliation: State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University , Changchun 130012, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Wu
authors.affiliation: State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University , Changchun 130012, China.
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergistic Innovation Center for Advanced Materials, Nanjing Tech University , 30 South Puzhu Road, Nanjing 211816, P.R. China.
authors.forename: Guichuan
authors.initials: G
authors.lastname: Xing
authors.affiliation: State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University , Changchun 130012, China.
authors.forename: William W
authors.initials: WW
authors.lastname: Yu
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
authors.forename: Xiaoyong
authors.initials: X
authors.lastname: Wang
authors.affiliation: State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University , Changchun 130012, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.|Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei, Anhui 230026, China.|Department of Physics, University of Arkansas , Fayetteville, Arkansas 72701, United States.
authors.forename: Min
authors.initials: M
authors.lastname: Xiao