Broadband Emission in Two-Dimensional Hybrid Perovskites: The Role of Structural Deformation
Broadband Emission in Two-Dimensional Hybrid Perovskites: The Role of Structural Deformation
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DOI：
10.1021/jacs.6b10390
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发表时间：
2017-01-11
影响因子：
15
通讯作者：
Petrozza, Annamaria
中科院分区：
文献类型：
--
作者：
Cortecchia, Daniele;Neutzner, Stefanie;Petrozza, Annamaria
只有一组选定的二维（2D）卤化铅钙钛矿表现出奇特的宽带光致发光。在这里，我们证明钙钛矿晶格的结构畸变可以通过调节缺陷形成能来确定材料的缺陷率。通过选择和比较两个原型系统，即(NBT)(2)PbI4和(EDBE)PbI4钙钛矿（NBT =正丁基铵和EDBE = 2,2-（乙二氧基）双（乙基铵）），我们发现只有后者在Pb-X键长和X-Pb-X键角发生较大变形的情况下才能形成 V-F 色心的辐射衰减最终导致 PL 变宽。这些发现凸显了结构工程对于控制此类软材料的光电特性的重要性。
Only a selected group of two-dimensional (2D) lead halide perovskites shows a peculiar broad-band photoluminescence. Here we show that the structural distortions of the perovskite lattice can determine the defectivity of the material by modulating the defect formation energies. By selecting and comparing two archetype systems, namely, (NBT)(2)PbI4 and (EDBE)PbI4 perovskites (NBT = n-butylammonium and EDBE = 2,2-(ethylenedioxy)bis(ethylammonium)), we find that only the latter, subject to larger deformation of the Pb-X bond length and X-Pb-X bond angles, sees the formation of V-F color centers whose radiative decay ultimately leads to broadened PL. These findings highlight the importance of structural engineering to control the optoelectronic properties of this class of soft materials.