东南大学付大伟团队报道了杂化钙钛矿显示出由卤素取代触发的温度依赖性PL和介电响应。相关研究成果于2023年12月25日发表在《结构化学》。

具有介电开关响应和光致发光（PL）的材料有望用于传感器和信息存储。在之前的研究中，人们通过将发光金属卤化物掺入有机铵化合物中，合成了一系列具有红色或绿色PL和介电开关能力的材料。然而，合成具有介电开关响应和橙色PL的有机-无机杂化材料的有效改性在各个领域仍然是一个挑战。橙色PL材料对开关和传感器很有价值，而且大多数橙色光源都来自稀土元素，这使得它们更难获得。

该文中，研究人员成功地合成了两种有机-无机杂化材料([CMPD]PbBr3 (1)和 [BMPD]PbBr3 (CMPD = N-ClCH2-N-甲基哌啶，BMPD=N-BrCH2-N-乙基哌啶），它们具有橙色PL和介电开关响应。当化合物1中的Cl被化合物2中的Br取代时，化合物的相变温度升高了45K。当暴露于紫外线灯时，这些化合物表现出迷人的橙色发光。

该项研究为探索具有橙色PL和介电开关响应的多功能材料提供了见解，并为卤素取代策略设计具有更高相变温度的材料提供了证据。

附：英文原文

Title: Hybrid perovskite shows temperature-dependent PL and dielectric response triggered by halogen substitution

Author: Xiao-Tong Sun, Hao-Fei Ni, Yi Zhang, Da-Wei Fu

Issue&Volume: 2023-12-25

Abstract: Materials exhibiting dielectric switching response and photoluminescence (PL) are promising for sensors and information storage. In previous research, we synthesized a series of materials with red or green PL and dielectric switching capabilities by incorporating luminescent metal halides into organic ammonium compounds. However, effective modification to synthesize organic-inorganic hybrid materials with dielectric switching response and orange PL continues to be a challenge in the respective fields. Orange PL materials are valuable for switching and sensors, and most orange light sources are derived from rare earth elements, making them harder to obtain. We have successfully synthesized two organic-inorganic hybrid materials ([CMPD]PbBr3 (1) and [BMPD]PbBr3 (CMPD = N-ClCH2-N-Methylpiperidine, BMPD = N-BrCH2-N-Methylpiperidine) that exhibit both orange PL and dielectric switching response. When Cl in compound 1 was substituted by Br in compound 2, the phase transition temperature of the compound was elevated by 45 K. These compounds exhibit captivating orange light emission when exposed to ultraviolet lamps. This research provides insights into exploring multifunctional materials with orange PL and dielectric switching response and provides proof for halogen substitution strategies to design materials with higher phase transition temperatures.

DOI: 10.1016/j.cjsc.2023.100212

Source: http://cjsc.ac.cn/cms/issues/549