光致发光
白光
卤化物
位阻效应
八面体
纳米晶
材料科学
钙钛矿(结构)
兴奋剂
光电子学
化学
结晶学
纳米技术
晶体结构
无机化学
立体化学
作者
Ruijing Fu,Wenya Zhao,Lingrui Wang,Zhiwei Ma,Guanjun Xiao,Bo Zou
标识
DOI:10.1002/anie.202015395
摘要
Abstract 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 6 H 5 CH 2 CH 2 NH 3 ) 2 PbCl 4 ((PEA) 2 PbCl 4 ) 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) 2 PbCl 4 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.
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