title: Low Threshold Two-Photon-Pumped Amplified Spontaneous Emission in CH3NH3PbBr3 Microdisks.
abstract: Two-photon-pumped amplified spontaneous emission (ASE) of CH3NH3PbBr3 microdisks (MDs) were investigated by using femtosecond laser system. Low threshold at 2.2 mJ cm(-2) was obtained. Also, emission spectral tunability from 500 to 570 nm was demonstrated by synthesis the mixed halide perovskite MDs. The spatial effect of photoluminescence (PL) properties under one-photon and two-photon excitation were also studied by means of two-photon laser scanning microscope (TPLSM) and time-resolved PL spectroscopy. It was found that the band to band emission of near-surface regions and photocarriers' diffusion from near-surface regions to interior regions is significant for one-photon excitation. By contrast, reabsorption of emission under two-photon excitation plays a major role in the emission properties of the MDs. These results will give a more comprehensive understanding of the nonlinear effect of CH3NH3PbBr3 single crystals.
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, P. R. China.|University of the Chinese Academy of Sciences , Beijing 100039, P. R. China.
authors.forename: Bin
authors.initials: B
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, P. R. China.|University of the Chinese Academy of Sciences , Beijing 100039, P. R. China.
authors.forename: Xin
authors.initials: X
authors.lastname: Mao
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, P. R. China.
authors.forename: Songqiu
authors.initials: S
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, P. R. China.|University of the Chinese Academy of Sciences , Beijing 100039, P. R. China.
authors.forename: Yajuan
authors.initials: Y
authors.lastname: Li
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, P. R. China.
authors.forename: Yanqiu
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Physics and Optoelectronics Engineering, Ludong University , Yantai 264025, China.
authors.forename: Meishan
authors.initials: M
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, P. R. China.
authors.forename: Weiqiao
authors.initials: W
authors.lastname: Deng
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science , Dalian 116023, P. R. China.
authors.forename: Keli
authors.initials: K
authors.lastname: Han
keywords: CH3NH3PbBr3; amplified spontaneous emission; perovskite; recombination; solution processed