Manipulating Emission Enhancement and Piezochromism in Two-Dimensional Organic-Inorganic Halide Perovskite [(HO)(CH2)2NH3)]2PbI4 by High Pressure
Manipulating Emission Enhancement and Piezochromism in Two-Dimensional Organic-Inorganic Halide Perovskite [(HO)(CH2)2NH3)]2PbI4 by High Pressure
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DOI：
10.31635/ccschem.020.202000430
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发表时间：
2021-01-01
期刊：
影响因子：
11.2
通讯作者：
Zou, Bo
中科院分区：
文献类型：
--
作者：
Fang, Yuanyuan;Zhang, Long;Zou, Bo
二维（2D）有机-无机卤化物钙钛矿呈现出显著的稳定性和多样性，并且是其三维（3D）对应物的有前途的替代物。2D卤化物钙钛矿[（HO）（CH 2）（2）NH3]（2）PbI 4（ETA（2）PbI（4））被认为是上级湿气稳定的“光滑”钙钛矿，因为连接相邻有机-无机层的独特氢键网络。然而，为了实际应用而有效地设计ETA（2）PbI（4）的光学性质仍然是相当大的挑战。本文利用金刚石对顶砧装置研究了压力对ETA（2）PbI（4）晶体光学特性和晶体结构的影响。在1.5 GPa下，发射增强了4倍，并伴随着光致发光（PL）峰变得更加对称，这是由于压力抑制非辐射复合和激子结合能的增加。当压力达到9.2GPa时，PL峰以14.4nm/GPa的速率从542 nm连续红移到674 nm。同时，光学显微照片显示可视化的压色性。高压原位同步辐射X射线衍射（XRD）、拉曼测量和第一性原理计算表明，[PbI 6]（4-）无机八面体的畸变与Pb-I-Pb键角和Pb-I键长的减小导致了这一系列的转变。我们的研究结果表明，2D卤化物ETA（2）PbI（4）是一个有前景的候选人的压力传感器。[图形]。
Two-dimensional (2D) organic-inorganic halide perovskites present remarkable stability and diversity and are promising alternatives to their three-dimensional (3D) counterparts. The 2D halide perovskite [(HO)(CH2)(2)NH3](2)PbI4 (ETA(2)PbI(4)) is regarded as a superior moisture-stabile "smooth" perovskite because of distinct hydrogen-bond networks that connect adjacent organic-inorganic layers. However, effectively engineering the optical properties of ETA(2)PbI(4) for practical applications still represents considerable challenges. Herein, we studied the effect of pressure on the optical characteristics and crystalline structure of ETA(2)PbI(4) through a diamond anvil cell. The emission was enhanced four times at 1.5 GPa and was accompanied by a photoluminescence (PL) peak that became more symmetric, which was attributed to pressure-suppression nonradiative recombination and an increase in exciton binding energy. Moreover, the red shift of the PL peak from 542 to 674 nm was continuous at a rate of 14.4 nm/GPa with pressure up to 9.2 GPa. Meanwhile, the optical micrographs showed visualized piezochromism. High-pressure in situ synchrotron X-ray diffraction (XRD), Raman measurements, and first-principles calculations indicated a distortion of the [PbI6](4-) inorganic octahedron with a decrease the Pb-I-Pb bond angle and the Pb-I bond length leading to this series of transformations. Our findings demonstrate that 2D halide ETA(2)PbI(4) is a prospective candidate for pressure sensors.[GRAPHICS].