华南师范大学许炳佳团队报道了用于防伪和信息加密的大面积柔性聚合物基透明薄膜的高效和可调色双模余辉。相关研究成果于2022年3月21日发表在《德国应用化学》。

开发高效、颜色可调的有机余辉聚合物基材料仍然是一个巨大的挑战。

该文合成了吲哚咔唑衍生物IaCzA和IbCzA，并将其掺杂到聚乙烯醇（PVA）基体中。研究发现，所制备的薄膜可以产生独特的双模余辉，这种余辉由持续的热激活延迟荧光和超长有机磷光组成。此外，掺IbCzA的PVA薄膜显示出强烈的蓝色余辉，Φ余辉和τ余辉分别高达19.8%和1.81秒，代表了最先进的双模有机余辉性能。此外，研究人员开发的薄膜具有高柔韧性、优异的透明度和大面积可生产性；薄膜的余辉颜色可以通过温度线性调节。受这些独特性能的启发，掺有IbCzA的PVA被用作防伪和信息加密的温度敏感安全油墨。

附：英文原文

Title: Efficient and Color-Tunable Dual-Mode Afterglow from Large-Area and Flexible Polymer-Based Transparent Films for Anti-Counterfeiting and Information Encryption

Author: Yifan Yang, Yaohui Liang, Yitao Zheng, Jian-An Li, Shiying Wu, Huaqing Zhang, Tepeng Huang, Suilian Luo, Cong Liu, Guang Shi, Fengqiang Sun, Zhenguo Chi, Bingjia Xu

Issue&Volume: 2022-03-21

Abstract: It remains a great challenge to develop polymer-based materials with efficient and color-tunable organic afterglow. Two indolocarbazole derivatives IaCzA and IbCzA have been synthesized and doped into poly(vinyl alcohol) (PVA) matrices. It is found that the resulting films can produce unique dual-mode afterglow, which is composed of persistent thermally activated delayed fluorescence and ultralong organic phosphorescence. Besides, the IbCzA-doped PVA film exhibits intense blue afterglow with  Φ  afterglow  and  τ  afterglow  up to 19.8% and 1.81 s, respectively, representing state-of-the-art dual-mode organic afterglow performance. Moreover, our reported film has high flexibility, excellent transparency, and large-area producibility; and the afterglow color of the film can be linearly tuned by temperature. Inspired by these distinctive properties, the PVA doped with IbCzA was employed as temperature-sensitive security ink for anti-counterfeiting and information encryption.

DOI: 10.1002/anie.202201820

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202201820