长余辉发光材料研究进展论文

5月5日，重庆理工大学材料学院杨朝龙副教授课题组在国际顶尖刊物《Science》 子刊《Science Advances》上发表了题为Ultralong room temperature phosphorescence from amorphous organic materials toward confidential information encryption and decryption的研究论文，这是国际上首次报道无定形聚合物基长余辉发光材料及其在机密信息领域的加密及解密应用。重庆理工大学材料学院为论文第一单位，材料学院硕士研究生苏艳作为第一作者，杨朝龙副教授与合作单位南洋理工大学Zhao Yanli教授为论文的共同通讯作者。

该论文被《Science Advances》选作亮点论文在官网滚动报道。这是重庆市高校科研成果首次登上Science子刊杂志首页并作滚动报道。

长余辉发光是指在撤去激发光源后仍然能够持续发光一段时间的一种独特光物理现象。这种现象一般存在于无机材料中，例如夜明珠。相对于无机长余辉材料，有机长余辉发光材料具有生物相容性好、柔性以及功能团易修饰等优点，在生物成像、光学记录、信息存储、防伪系统等诸多高新科技领域有着巨大的应用前景。但纯有机长余辉现象通常只在很低的温度（77 K）和无氧环境等苛刻条件下才能被观察到，在室温实现高效有机长余辉是一个极大的挑战。

基于此，杨朝龙副教授课题组与南洋理工大学Zhao Yanli教授课题组合作，自主设计了含有六个苯甲酸单元的六（4-羧酸-苯氧基）-环磷腈（G）客体分子(图三)。在室温条件下，G本身不发射任何的荧光或磷光。当G引入到聚乙烯醇（PVA）基质膜中，在激发光源关闭后表现出明显的长余辉现象，且展现出强烈的紫外辐照依赖性 (图三)。课题组基于辐照依赖特性，创新开发出完全具有自主知识产区的的绿色环保无油墨丝网印刷技术，该技术可应用于票据、奢侈品、纸币、军方/政府机密文件等的高级防伪（图四）。

研究工作得到了国家自然科学基金、国家留学基金、重庆市科委、重庆市教委、新加坡学术研究基金等项目，以及材料学院和高分子材料与加工技术校级首批科研团队的大力支持。

《Science Advances》为《Science》刊物旗下子刊，内容涵盖物理、化学、生物、计算机、工程、数学以及社会科学等学术领域，旨在发表推进科学发展的具有重要影响力和创新性的前沿工作。

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长余晖指的是在紫外可见光、X射线等激发光停止后，仍可以持续发光几秒甚至几个小时的一类发光现象，如同传说中的夜明珠在黑暗下也可以持续发光。科研人员从稀土卤化物晶格中获取灵感，制备出新型的稀土纳米闪烁体长余晖材料。