Remarkable Turn‐On and Color‐Tuned Piezochromic Luminescence: Mechanically Switching Intramolecular Charge Transfer in Molecular Crystals,Advanced Functional Materials

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Remarkable Turn‐On and Color‐Tuned Piezochromic Luminescence: Mechanically Switching Intramolecular Charge Transfer in Molecular Crystals
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2015-05-15 , DOI: 10.1002/adfm.201501224
Qingkai Qi ₁ , Jingyu Qian ₁ , Xiao Tan ₂ , Jibo Zhang ₁ , Lijuan Wang ₁ , Bin Xu ₁ , Bo Zou ₂ , Wenjing Tian ₁

Affiliation

The molecular crystals of acridonyl‐tetraphenylethene (AD‐TPE) exhibit an intriguing turn‐on and color‐tuned luminescence in response to mechanical grinding and hydrostatic compression. On the basis of in‐depth experimental and computational studies, it is hypothesized that the origin of the piezochromic behavior from the D‐phase to the B‐phase is the change of the intramolecular geometrical conformation, especially for the torsion angle between the TPE and AD moiety. The different molecular conformation in the two distinctive solid phases causes the substantial switching of the intramolecular charge transfer (ICT) process, which can be directly correlated with the subsequent fluorescence from locally excited (LE) state and ICT state in both phases. The AD‐TPE molecular system presents a very rare example of high‐contrast reversible fluorescence tuning driven by a switching of the excited state in the solid state under the mechanical stimuli, and thus provides a novel mechanism of the piezochromic behavior.

中文翻译：

显着的开启和色彩调节的压致变色发光：分子晶体中机械切换分子内电荷转移

cri啶基四苯乙烯（AD-TPE）的分子晶体响应机械研磨和静水压缩表现出令人着迷的开启和颜色调整的发光。在深入的实验和计算研究的基础上，假设从D相到B相的压致变色行为的起源是分子内几何构象的变化，特别是对于TPE和TPE之间的扭转角而言。 AD部分。在两个不同的固相中不同的分子构象导致分子内电荷转移（ICT）过程的实质转换，这可以与随后在两个阶段中从局部激发（LE）状态和ICT状态发出的荧光直接相关。

更新日期：2015-05-15

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