Fu Ruijing, Zhao Wenya, Wang Lingrui, Ma Zhiwei, Xiao Guanjun, Zou Bo
State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.
Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Engineering, Zhengzhou University, Zhengzhou, 450001, China.
Angew Chem Int Ed Engl. 2021 Apr 26;60(18):10082-10088. doi: 10.1002/anie.202015395. Epub 2021 Mar 24.
The pressure-induced emission (PIE) behavior of halide perovskites has attracted widespread attention and has potential application in pressure sensing. However, high-pressure reversibility largely inhibits practical applications. Here, we describe the emission enhancement and non-doping control of the color temperature in two-dimensional perovskite (C H CH CH NH ) PbCl ((PEA) PbCl ) nanocrystals (NCs) through high-pressure processing. A remarkable 5 times PIE was achieved at a mild pressure of 0.4 GPa, which was highly associated with the enhanced radiative recombination of self-trapped excitons. Of particular importance is the retention of the 1.6 times emission of dense (PEA) PbCl NCs upon the complete release of pressure, accompanied by a color change from "warm" (4403 K) to "cold" white light with 14295 K. The irreversible pressure-induced structural amorphization, which facilitates the remaining local distortion of inorganic Pb-Cl octahedra with respect to the steric hindrance of organic PEA cations, should be greatly responsible for the quenched high-efficiency photoluminescence.
卤化物钙钛矿的压力致发光（PIE）行为已引起广泛关注，并在压力传感方面具有潜在应用。然而，高压可逆性在很大程度上限制了其实际应用。在此，我们描述了通过高压处理实现二维钙钛矿（CH₃CH₂CH₂NH₃）₂PbCl₄（（PEA）₂PbCl₄）纳米晶体（NCs）的发光增强和色温的非掺杂控制。在0.4 GPa的温和压力下实现了显著的5倍PIE，这与自陷激子辐射复合增强高度相关。特别重要的是，在压力完全释放后，致密（PEA）₂PbCl₄ NCs的发光保留了1.6倍，同时伴随着颜色从“暖”（4403 K）变为“冷”白光（14295 K）。不可逆的压力诱导结构非晶化，有利于无机Pb-Cl八面体相对于有机PEA阳离子的空间位阻保持局部畸变，这应该是高效光致发光猝灭的主要原因。
