@article{c30bb1cfa5f147ba81cf4d464c6920d9,
title = "Hemispherical Cesium Lead Bromide Perovskite Single-Mode Microlasers with High-Quality Factors and Strong Purcell Enhancement",
abstract = "We realized a single-mode laser with an ultra-high quality factor in individual cesium lead bromide (CsPbBr3) perovskite micro-hemispheres fabricated by chemical vapor deposition. A series of lasing property analysis based on cavity size was reported under this material system. Due to good optical confinement capability of the whispering gallery resonant cavity and high optical gain of CsPbBr3 perovskite micro-hemispheres, single-mode lasing behavior was achieved with an ultra-high quality factor as large as 11,460 at room temperature. To study in detail the physical effects between lasing threshold and cavity, a set of cavity size dependence photoluminescence analyses were performed. We found that the lasing threshold increases while the cavity size decreases. Time-resolved PL analysis was conducted to confirm the relation between cavity size and lasing threshold. The larger cavity stands for longer PL lifetime and indicates easier-to-achieve carrier population inversion. Strong Purcell enhancement could be further investigated by the spontaneous emission coupling factor β and internal quantum efficiency as a function of cavity size. A high β-factor of 0.37 could be obtained from a 2.2 μm diameter hemisphere microcavity and a high Purcell factor of 14 in a 1.9 μm diameter hemisphere microcavity showing strong Purcell enhancement effect in our system. ",
author = "Wu, {Chun Sheng} and Wu, {Sheng Chan} and Yang, {Bo Ting} and Wu, {Zong Yu} and Chou, {Yu Hsun} and Peter Chen and Hsu, {Hsu Cheng}",
note = "Funding Information: This report was supported by the Ministry of Science and Technology (MOST), Taiwan, under awards of MOST 109-2112-M-006-016. This research was also, in part, supported by the Ministry of Education Taiwan. Headquarters of University Advancement to the National Cheng Kung University (NCKU). P.C. thanks the research grant from MOST (MOST 107-2221-E-006-190-MY3, MOST 108-2218-E-006-043-MY3, and MOST 109-3116-F-006-011). This research was also financially supported by the Hierarchical Green-Energy Materials (Hi-GEM) Research Center from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) and the MOST (MOST 109-2634-F-006-020) in Taiwan. At last, this work was financially supported from the Young Scholar Fellowship Program by MOST in Taiwan under grant MOST 109-2636-M-006-014. Funding Information: This report was supported by the Ministry of Science and Technology (MOST), Taiwan, under awards of MOST 109-2112-M-006-016. This research was also, in part, supported by the Ministry of Education, Taiwan. Headquarters of University Advancement to the National Cheng Kung University (NCKU). P.C. thanks the research grant from MOST (MOST 107-2221-E-006-190-MY3, MOST 108-2218-E-006-043-MY3, and MOST 109-3116-F-006-011). This research was also financially supported by the Hierarchical Green-Energy Materials (Hi-GEM) Research Center from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) and the MOST (MOST 109-2634-F-006-020) in Taiwan. At last, this work was financially supported from the Young Scholar Fellowship Program by MOST in Taiwan under grant MOST 109-2636-M-006-014. Publisher Copyright: {\textcopyright} 2021 American Chemical Society.",
year = "2021",
month = mar,
day = "24",
doi = "10.1021/acsami.0c21738",
language = "English",
volume = "13",
pages = "13556--13564",
journal = "ACS applied materials & interfaces",
issn = "1944-8244",
publisher = "American Chemical Society",
number = "11",
}