title: Tunable perovskite microdisk lasers.
abstract: Perovskite microdisk lasers have been intensively studied recently. But their lasing properties are usually fixed once the devices are synthesized. Here, for the first time, we demonstrated the switchable and tunable perovskite microdisk lasers by surrounding them with 5CB liquid crystals. With the increase of the environmental temperature from 24 °C to 34 °C, the lasing wavelength slightly changed from 552.91 nm to 552.11 nm at the beginning and suddenly shifted to around 552.54 nm at T = 32 °C, where the phase transition of liquid crystals occurs. Our numerical calculation shows that the wavelength shift is caused by the changes of the refractive index of liquid crystals. More than tuning of the wavelength, a more dramatic wavelength transition from ∼554 nm to 550 nm has also been observed. This sudden transition is mainly induced by the reduction of scattering rather than the change in the refractive index when the liquid crystals are changed from the nematic phase to the isotropic phase. We believe that our research can shed light on the applications of perovskite optoelectronics.
authors.affiliation: Integrated Nanoscience Lab, Department of Electrical and Information Engineering, Harbin Institute of Technology, Shenzhen, 518055, China. qinghai.song@hitsz.edu.cn.
authors.forename: Wenzhao
authors.initials: W
authors.lastname: Sun
authors.forename: Kaiyang
authors.initials: K
authors.lastname: Wang
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Gu
authors.forename: Shumin
authors.initials: S
authors.lastname: Xiao
authors.forename: Qinghai
authors.initials: Q
authors.lastname: Song