上海交通大学袁望章团队报道了脂肪族季铵盐史无前例的易调谐光致发光。相关研究成果发表在2022年1月17日出版的国际学术期刊《德国应用化学》。

含有脂肪胺的化合物在适当的条件下可以发射光。然而，它们的电离对应物，即季铵盐（QASs），被广泛用作相转移催化剂、离子液体、消毒剂和表面活性剂，被称为发光猝灭剂并被认为是非发射的。

该文中，研究人员报道了前所未有的各种QASs的固有荧光/磷光双重发射，其可通过改变激发波长、烷基链长度、反离子和机械刺激进行精细调节。明亮的光致发光以及明显的余辉和可调谐的多色发射使得QASs固体在先进的多模防伪中的应用成为可能。该发现刷新了对QASs的理解，并可能激发基于QASs固有发光利用的新兴应用。此外，它为通过光物理方法研究QAS相关过程和功能提供了机会，并为新型非常规发光体的制造提供了强有力的启示。

附：英文原文

Title: Unprecedented and Readily Tunable Photoluminescence from Aliphatic Quaternary Ammonium Salts

Author: Saixing Tang, Zihao Zhao, Jinquan Chen, Tianjia Yang, Yunzhong Wang, Xiaohong Chen, Meng Lv, Wang Zhang Yuan

Issue&Volume: 2022-01-17

Abstract: Compounds bearing aliphatic amines can be emissive under appropriate conditions. However, their ionized counterparts, namely, quaternary ammonium salts (QASs), which are widely used as phase-transfer catalysts, ionic liquids, disinfectants, and surfactants, are known as luminescence quenchers and considered non-emissive. Herein, unprecedented intrinsic fluorescence/phosphorescence dual emissions from various QASs are reported, which can be finely regulated by changing the excitation wavelength, alkyl chain length, counterion, and mechanical stimuli. The bright photoluminescence along with distinct afterglow and tunable multicolor emissions enables the application of QAS solids in advanced multimode anticounterfeiting. This finding refreshes the understanding of QASs and may inspire emerging applications based on the utilization of the intrinsic luminescences of QASs. Furthermore, it opens opportunities for the investigation of QAS-related processes and functions  via  a photophysical approach and affords strong implications for the fabrication of novel nonconventional luminophores.

DOI: 10.1002/anie.202117368

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202117368