东北林业大学陈志俊团队报道了木质素发出的红色室温磷光。相关研究成果发表在2024年12月24日出版的《德国应用化学》。

来自可持续来源的具有红色室温磷光（RTP）的材料至关重要，但很少有报道。

该文中，研究人员用木质素生产红色RTP材料。木质素与Upy（1-（6-异氰酸酯基己基）-3-（6-甲基-4-氧代-1,4-二氢嘧啶-2-基）脲）共价改性，得到Lig-Upy。Lig-Upy中的Upy促进了木质素芳香单元之间的相互作用，并减少了这些分子的能隙。因此，Lig-Upy表现出以625 nm为中心的红色RTP，寿命为24.2 ms。

此外，当嵌入聚乙烯醇（PVA）或钠蒙脱石（MTM）等不同基质中时，Lig-Upy中的氢键相互作用会发生变化，从而导致RTP波长和寿命的变化。利用这些特性，Lig-Upy被用作生产表现出时间依赖磷光颜色（TDPC）材料的构建块。这种TDPC材料在视觉装饰、信息加密和药瓶防伪标识方面，显示出巨大的潜力。

附：英文原文

Title: Red room temperature phosphorescence from lignin

Author: Hongda Guo, Huanjie Cheng, Ruixia Liu, Xiaoxia Chen, Luyao Wang, Chenhui Yang, Shujun Li, Shouxin Liu, Jian Li, Qingjiang Pan, Tony D James, Zhijun Chen

Issue&Volume: 2024-12-24

Abstract: Materials with red room-temperature phosphorescence (RTP) derived from sustainable sources are crucial but rarely reported. Here, we produced red RTP materials from lignin. Lignin was covalently modified with Upy (1-(6-isocyanatohexyl)-3-(6-methyl-4-oxo-1,4-dihydropyrimidin-2-yl) urea) to obtain Lig-Upy. The Upy in the Lig-Upy promoted the interaction between the aromatic units of lignin and reduced energy gaps of these molecules. As a result, Lig-Upy exhibited red RTP centered at 625 nm with a lifetime of 24.2 ms. Moreover, the hydrogen bonding interactions in Lig-Upy varied when embedded into different matrices, such as polyvinyl alcohol (PVA) or sodium montmorillonite (MTM), inducing a change in RTP wavelength and lifetime. Utilizing these properties, Lig-Upy was used as building blocks for producing materials exhibiting time-dependent phosphorescent colors (TDPCs). Such TDPCs materials have exhibited great potential for visual decorations, information encryption and anti-counterfeiting logos for medicine bottles.

DOI: 10.1002/anie.202421112

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202421112