湖州大学张玉建团队报道了o-碳硼烷二元体系中基于激发依赖电子转移过程的多色荧光。相关研究成果发表在2022年1月5日出版的《德国应用化学》。

具有激发波长依赖性（Ex-de）发射的有机材料在防伪、光电子和生物测定等方面具有很高的吸引力；然而，实现独立于聚集态的Ex-de荧光仍然是一个挑战。

该文中，研究人员报告一种光诱导电子转移（PeT）策略，通过操纵多个激发态的弛豫路径来设计Ex-de荧光材料。正如预期的那样，由于双荧光光谱的相对强度可调，o-碳硼烷二元在聚集态呈现出清晰的荧光颜色。以TP[1]B为例，非晶态粉末在390nm、365 nm和254 nm紫外光照射下分别发出明亮的蓝紫色、白色和黄色。重要的是，展示了使用该o-碳硼烷二元体的多色、柔性和透明薄膜以及防伪应用。

附：英文原文

Title: Multicolor Fluorescence based on Excitation-Dependent Electron Transfer Processes in o-Carborane Dyads.

Author: Heyi Yang, Haichao Liu, Yunxia Shen, Shitong Zhang, Qing Zhang, Qingbao Song, Chunyan Lv, Cheng Zhang, Bing Yang, Yuguang Ma, Yujian Zhang

Issue&Volume: 2022-01-05

Abstract: Organic materials with excitation wavelength-dependent (Ex-de) emission are highly attractive for anticounterfeiting, optoelectronics and bioassay applications; however, the realization of Ex-de fluorescence, independent of aggregation states, remains a challenge. We herein report a photoinduced electron transfer (PeT) strategy to design Ex-de fluorescence materials by manipulating the relaxation pathways of multiple excited states. As expected, the o-carborane dyad presents a clear Ex-de fluorescence colour in the aggregated states, resulting from the tunable relative intensity of the dual-fluorescence spectra. Taking TP[1]B as an example, the amorphous powders emitted bright blue-violet, white and yellow colours under 390 nm, 365 nm and 254 nm UV illumination, respectively. Importantly, multicolour, flexible and transparent films as well as an anticounterfeiting application using this o-carborane dyad are demonstrated.

DOI: 10.1002/anie.202115551

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202115551