Open AccessStable and enhanced frequency up-converted lasing from CsPbBr3 quantum dots embedded in silica sphere
Author(s) -
Zhengzheng Liu,
Zhiping Hu,
Tongchao Shi,
Juan Du,
Jie Yang,
Zeyu Zhang,
Xiaosheng Tang,
Yuxin Leng
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.009459
Subject(s) - lasing threshold , whispering gallery wave , materials science , perovskite (structure) , quantum dot , optoelectronics , laser , optics , photonics , gain switching , resonator , physics , chemistry , wavelength , crystallography
Perovskites have emerged as a class of cutting-edge light-emitting materials; however, their poor stability, due to the high sensitivity to moisture in the ambient environment, severely hinders their further application. Here, to obtain stable perovskite-based laser with excellent optical performance, all-inorganic perovskite CsPbBr 3 quantum dots (QDs) evenly distributed into sub-micro silica sphere (CsPbBr 3 -SiO 2 ) have been used as laser gain medium. The single silica sphere embedded by plentiful CsPbBr 3 QDs demonstrates frequency up-converted lasing with compounded mode of random and whispering-gallery-mode (WGM) at room temperature. Furthermore, by incorporating the CsPbBr 3 -SiO 2 spheres into a microtubule, the frequency up-converted WGM lasing has been successfully achieved under two-photon excitation. Notably, the CsPbBr 3 -SiO 2 microtubule resonator exhibits a low lasing threshold of 430 μJ/cm 2 , mostly due to the enhanced gain for CsPbBr 3 QDs inside the silica sphere. Moreover, stable WGM lasing is observed under continuous optical pump for 140 min, benefited from the protection of silica shells, which isolate the QDs from the environmental conditions. The enhanced lasing performance provides an effective way for further exploration and application of perovskite-based micro/nano photonic devices.