Pressure-Induced Emission toward Harvesting Cold White Light from Warm White Light
Pressure-Induced Emission toward Harvesting Cold White Light from Warm White Light
复制标题
从暖白光中获取冷白光的压力诱导发射
DOI：
10.1002/anie.202015395
复制
发表时间：
2021-03-24
影响因子：
16.6
通讯作者：
Zou, Bo
中科院分区：
文献类型：
--
作者：
Fu, Ruijing;Zhao, Wenya;Zou, Bo
卤化物钙钛矿的压力诱导发射（PIE）行为引起了广泛的关注，并在压力传感方面具有潜在的应用前景。然而，高压可逆性很大程度上限制了实际应用。在这里，我们描述了通过高压处理二维钙钛矿（C6H5CH2CH2NH3）（2）PbCl4（（PEA）（2）PbCl4）纳米晶体（NC）中色温的增强和非掺杂控制。在 0.4 GPa 的温和压力下实现了显着的 5 倍 PIE，这与自俘获激子的增强辐射复合高度相关。特别重要的是，在完全释放压力后，稠密 (PEA)(2)PbCl4 NC 的 1.6 倍发射率得以保留，并伴随着从“暖”(4403 K) 到“冷”白光 (14295 K) 的颜色变化。不可逆的压力诱导的结构非晶化，有利于无机 Pb-Cl 八面体在空间方面的剩余局部变形。 有机PEA(+)阳离子的阻碍，应该对猝灭高效光致发光有很大的影响。
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 (C6H5CH2CH2NH3)(2)PbCl4 ((PEA)(2)PbCl4) 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)PbCl4 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.