Stability and band gap engineering of silica-confined lead halide perovskite nanocrystals under high pressure

作     者：Ruijing Fu Yaping Chen Lingrui Wang Zhiwei Ma Pengfei Lv Ying Song Songrui Yang Guanjun Xiao Bo Zou Ruijing Fu;Yaping Chen;Lingrui Wang;Zhiwei Ma;Pengfei Lv;Ying Song;Songrui Yang;Guanjun Xiao;Bo Zou

作者机构：State Key Laboratory of Superhard MaterialsCollege of PhysicsJilin UniversityChangchun130012China Key Laboratory of Materials Physics of Ministry of EducationSchool of Physics and EngineeringZhengzhou UniversityZhengzhou450001China 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2021年第12卷第2期

页      面：957-963页

核心收录：

学科分类：070904[理学-构造地质学] 0709[理学-地质学] 07[理学] 

基　　金：the National Science Foundation of China(Grant Nos.21725304,11774125,and 21673100) the Chang Jiang Scholars Program of China(Grant No.T2016051) Changbai Mountain Scholars Program(Grant No.2013007) National Defense Science and Technology Key Laboratory Fund(Grant No.6142A0306010917) Jilin Provincial Science&Technology Development Program(Grant No.20190103044JH) Scientific Research Planning Project of the Education Department of Jilin Province(Grant No.JJKH20180118KJ) 

主　　题：Core-shell Perovskite CsPbBr3@SiO2 nanocrystals DAC High pressure Isostructural phase transformation 

摘      要：SiO_(2)is the major mineral substance in the upper mantle of the ***,studies of the silica-coated materials under high-pressure are essential to explore the physical and chemical properties of the upper *** silica-confined CsPbBr_(3)nanocrystals(NCs)have recently attracted much attention because of the improved photoluminescence(PL)quantum yield,owing to the protection of silica ***,it remains considerable interest to further explore the relationship between optical properties and the structure of CsPbBr_(3)@SiO_(2)*** systemically studied the structural and optical properties of the CsPbBr_(3)@SiO_(2)NCs under high pressure by using diamond anvil cell(DAC).The discontinuous changes of PL and absorption spectra occurred at~1.40 *** X-ray diffraction(XRD)studies of CsPbBr_(3)@SiO_(2)NCs under high pressure indicated an isostructural phase transformation at about 1.36 GPa,owing to the pressure-induced tilting of the Pb-Br *** isothermal bulk moduli for two phases are estimated about 60.0 GPa and 19.2 GPa by fitting the equation of ***,the transition pressure point of CsPbBr_(3)@SiO_(2)NCs is slightly higher than that of pristine CsPbBr_(3)NCs,which attributed to the buffer effect of coating silica *** results indicate that silica shell is able to enhance the stabilization without changing the relationship between optical properties and structure of CsPbBr_(3)*** results were fascinated to model the rock metasomatism in the upper mantle and provided a new‘lithoprobe’for detecting the upper mantle.