Fan Chang-Chun, Liu Cheng-Dong, Liang Bei-Dou, Wang Wei, Jin Ming-Liang, Chai Chao-Yang, Jing Chang-Qing, Ju Tong-Yu, Han Xiang-Bin, Zhang Wen
Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics and School of Chemistry and Chemical Engineering, Southeast University, 211189, Nanjing, China.
Nat Commun. 2024 Feb 17;15(1):1464. doi: 10.1038/s41467-024-45986-6.
Tuning phase transition temperature is one of the central issues in phase transition materials. Herein, we report a case study of using enantiomer fraction engineering as a promising strategy to tune the Curie temperature (T) and related properties of ferroelectrics. A series of metal-halide perovskite ferroelectrics (S-3AMP)(R-3AMP)PbBr was synthesized where 3AMP is the 3-(aminomethyl)piperidine divalent cation and enantiomer fraction x varies between 0 and 1 (0 and 1 = enantiomers; 0.5 = racemate). With the change of the enantiomer fraction, the T, second-harmonic generation intensity, degree of circular polarization of photoluminescence, and photoluminescence intensity of the materials have been tuned. Particularly, when x = 0.70 - 1, a continuously linear tuning of the T is achieved, showing a tunable temperature range of about 73 K. This strategy provides an effective means and insights for regulating the phase transition temperature and chiroptical properties of functional materials.
调节相变温度是相变材料中的核心问题之一。在此，我们报告了一个案例研究，即使用对映体分数工程作为一种有前景的策略来调节铁电体的居里温度（Tc）及相关性质。合成了一系列金属卤化物钙钛矿铁电体（S-3AMP）（R-3AMP）PbBr，其中3AMP是3-（氨甲基）哌啶二价阳离子，对映体分数x在0到1之间变化（0和1 = 对映体；0.5 = 外消旋体）。随着对映体分数的变化，材料的Tc、二次谐波产生强度、光致发光的圆偏振度和光致发光强度都得到了调节。特别地，当x = 0.70 - 1时，实现了Tc的连续线性调节，显示出约73 K的可调温度范围。该策略为调节功能材料的相变温度和手性光学性质提供了一种有效手段和见解。
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