title: Controllable lasing performance in solution-processed organic-inorganic hybrid perovskites.
abstract: Solution-processed organic-inorganic perovskites are fascinating due to their remarkable photo-conversion efficiency and great potential in the cost-effective, versatile and large-scale manufacturing of optoelectronic devices. In this paper, we demonstrate that the perovskite nanocrystal sizes can be simply controlled by manipulating the precursor solution concentrations in a two-step sequential deposition process, thus achieving the feasible tunability of excitonic properties and lasing performance in hybrid metal-halide perovskites. The lasing threshold is at around 230 μJ cm-2in this solution-processed organic-inorganic lead-halide material, which is comparable to the colloidal quantum dot lasers. The efficient stimulated emission originates from the multiple random scattering provided by the micro-meter scale rugged morphology and polycrystalline grain boundaries. Thus the excitonic properties in perovskites exhibit high correlation with the formed morphology of the perovskite nanocrystals. Compared to the conventional lasers normally serving as a coherent light source, the perovskite random lasers are promising in making low-cost thin-film lasing devices for flexible and speckle-free imaging applications.
authors: Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan. fcchen@mail.nctu.edu.tw timtclu@mail.nctu.edu.tw.
authors: Tsung Sheng
authors: TS
authors: Kao
authors: Institute of Lighting and Energy Photonics, College of Photonics, National Chiao Tung University, Tainan 71150, Taiwan.
authors: Yu-Hsun
authors: YH
authors: Chou
authors: Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan. fcchen@mail.nctu.edu.tw timtclu@mail.nctu.edu.tw.
authors: Kuo-Bin
authors: KB
authors: Hong
authors: Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan. fcchen@mail.nctu.edu.tw timtclu@mail.nctu.edu.tw.
authors: Jiong-Fu
authors: JF
authors: Huang
authors: Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan. fcchen@mail.nctu.edu.tw timtclu@mail.nctu.edu.tw.
authors: Chun-Hsien
authors: CH
authors: Chou
authors: Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan. fcchen@mail.nctu.edu.tw timtclu@mail.nctu.edu.tw.
authors: Hao-Chung
authors: HC
authors: Kuo
authors: Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan. fcchen@mail.nctu.edu.tw timtclu@mail.nctu.edu.tw.
authors: Fang-Chung
authors: FC
authors: Chen
authors: Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan. fcchen@mail.nctu.edu.tw timtclu@mail.nctu.edu.tw.
authors: Tien-Chang
authors: http://orcid.org/0000-0003-4192-9919
authors: TC
authors: Lu