On December 3, 2021, the ultrafast optical group led by Prof. Lu Peixiang published an online paper entitled as "Highly Tunable Enhancement and Switching of Nonlinear Emission from All-Inorganic Lead Halide Perovskites via Electric Field" in the journal of Nano Letters.
Abstract: Herein, we demonstrate a highly tunable enhancement and switching of nonlinear emission from all-inorganic metalhalide perovskites based on an asymmetrically biased metal− insulator−semiconductor (MIS) structure. We achieve 2 orders of magnitude enhancement of the two-photon-pumped photoluminescence (TPL) from CsPbBr3 microplates with the MIS structure, due to comprehensive effects including localized field effect, trapfilling effect, and collection enhancement. In particular, taking advantage of electric-field-induced passivation/activation of Br vacancies, we realize highly tunable TPL enhancement, ranging from∼61.2-fold to∼370.3-fold. Moreover, we demonstrate an efficient modulation of the two-photon-pumped lasing from the MIS structure, which exhibits electric field induced switching with a highon/off ratio of 67:1. This work has opened new avenues for steering carrier transport and nonlinear emission in lead halideperovskites, which shows great promise for realizing high-efficiency and tunable nonlinear nanophotonic devices.
Figure. (a) Dark-field PL images of the MIS structure with voltages varying from −12 V to +12 V. (b) Measured TPL spectra with voltages varying from −12 V to +12 V. (c) Plots of TPL intensities versus voltage for the MIS structure (red dots) and bare CsPbBr3 microplate (blue dots).(d) Plot of the TPL enhancement factor of the MIS structure versus voltage. Inset: Reversible electric field modulated TPL in the MIS structure
Prof. Lu Peixiang and Associate Prof. Liu Weiwei are the co-corresponding authors of the paper. The first author is a PhD student, Gao Yan from our school and a youth teacher, Li Xiaohong from Wuhan Institute of Technology. Prof. Wang Bing and Prof. Wang Kai from our school also made significant contributions to the research work. This work was financially supported by the National Natural Science Foundation of China (Grants ****4109 and ****4117) and The National Natural Science Foundation of China for Innovative Research Groups (Grant ****1004).
Link to this paper: https://pubs.acs.org/doi/pdf/10.1021/acs.nanolett.1c03142
