多模发光胆甾相液晶微胶囊的制备及性能研究  

Preparation and Properties of Multimode Luminescent Cholesteric-Liquid-Crystal Microcapsules

作　　者：王语扬 陈硕然 赵鑫[1] 许宗意 叶常青[1] WANG Yu-yang;CHEN Shuo-ran;ZHAO Xin;XU Zong-yi;YE Chang-qing(Research Center for Green Printing Nanophotonic Materials,Suzhou University of Science and Technology,Suzhou 215009,China)

机构地区：[1]苏州科技大学绿色印刷纳米光子工程技术研究中心,苏州215009

出　　处：《印刷与数字媒体技术研究》2023年第2期130-138,共9页Printing and Digital Media Technology Study

基　　金：国家自然科学基金项目(No.51873145);江苏省第五期“333高层次人才培养工程”(No.BRA2018340);江苏省“六大人才高峰”(No.XCL-79);江苏高校“青蓝工程”。

摘　　要：以溶剂挥发法制备聚甲基丙烯酸甲酯(PMMA)微胶囊作为胆甾相液晶(CLC)的载体,通过调节液晶中手性剂的含量,可以实现红、绿、蓝三种结构色。本研究探讨了芯材与壁材的质量比、乳化搅拌速度对微胶囊形貌、尺寸及结构色等性质的影响。在此基础上,通过在CLC中掺杂三线态-三线态湮灭上转换(TTA-UC)有机染料分子,包括光敏剂八乙基卟啉铂(PtOEP)与湮灭剂9,10-二苯基蒽(DPA),可以使微胶囊在532nm连续激光的激发下实现蓝色上转换发光;也可通过仅掺杂DPA在紫外激发下实现蓝色荧光发射。该微胶囊可利用喷涂方法实现图案化制备并应用于多模防伪,通过将CLC结构色、紫外激发荧光以及绿色激光激发上转换发光三种模式相结合,可以在同一图案中获得三种不同的显色/发光效果。这一多功能微胶囊技术在防伪包装领域具有良好的应用前景。Polymethyl methacrylate(PMMA)microcapsules were fabricated by a solvent evaporation method as the carrier of cholesteric liquid crystal(CLC).Three types of structural colors,red,green and blue,were obtained by controlling the content of chiral dopant in CLC.The influences of core/wall material mass ratio,emulsifying and stirring speed on the morphology,size,structural color and other properties were investigated in this study.Moreover,by doping organic dye molecules of triplet-triplet annihilation upconversion(TTA-UC)system,including the sensitizer Platinum octaethylporphyrin(PtOEP)and the annihilator 9,10-diphenylanthracene(DPA),the microcapsules could achieve blue UC emission under the excitation of a 532nm continuous wave laser,and blue fluorescence could also be achieved under the excitation of ultraviolet(UV)light by doping DPA only.The microcapsules could be patterned through a spray coating method and applied for multimode anticounterfeiting by the combination of CLC structural color,UV excited fluorescent emission and green laser excited UC emission,which could display three different types of colored or luminescent patterns.This multi-function microcapsule technology shows a promising prospect in the field of anticounterfeiting packaging.

关 键 词：微胶囊 胆甾相液晶 三线态-三线态湮灭 上转换 结构色 多模发光 防伪 

分 类 号：TS853.6[轻工技术与工程]