长余辉室温磷光碳点的制备及其防伪应用  

Preparation and anti-counterfeiting application of carbon dots with long lifetime room temperature phosphorescence

作　　者：李季 王玉玉 张苑 郑道元 王学川 LI Ji;WANG Yu-yu;ZHANG Yuan;ZHENG Dao-yuan;WANG Xue-chuan(College of Bioresources Chemical and Materials Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China;Institute of Molecular Sciences and Engineering,Shandong University,Qingdao 266237,China)

机构地区：[1]陕西科技大学轻工科学与工程学院,陕西西安710021 [2]山东大学分子科学与工程研究所,山东青岛266237

出　　处：《陕西科技大学学报》2021年第6期103-109,共7页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(21808134);国家重点研发计划项目(2017YFB0308502)。

摘　　要：随着对碳点光致发光特性的深入研究,碳点的室温磷光现象也开始备受关注.实验以ε-聚赖氨酸为原料,通过一步水热法制备了具有蓝色荧光的碳点(激发波长为380 nm,发射波长为450 nm),荧光量子产率达6.54%.在固体状态下,经紫外灯激发后显示出长波长(570 nm)的黄色室温磷光,寿命可达213 ms.为了进一步提高其磷光寿命,在水热体系中引入了聚丙烯酸钠作为基质制备碳点/聚丙烯酸钠复合磷光材料,结果显示其磷光寿命为525 ms,提高到碳点的2.5倍,裸眼观察时间持续到4.3 s.由于原料的环保性以及碳点优异的光学性能,其在防伪以及信息加密领域呈现出潜在的应用价值.The room temperature phosphorescence performance of carbon dots has attracted attention.In this experiment,ε-polylysine was used as the raw material to prepare blue fluorescent carbon dots(excitation wavelength of 380 nm,emission wavelength of 450 nm)by one-step hydrothermal method,and the fluorescence quantum yield reached 6.54%.In the solid state,the carbon dots shows long-wavelength(570 nm)yellow room temperature phosphorescence after being excited by an ultraviolet lamp,with a lifetime up to 213 ms.At the same time,sodium polyacrylate was introduced as a matrix to further improve its phosphorescence property.The results showed that the lifetime of carbon dots/sodium polyacrylate composite material was 525 ms(4.3 s to naked eyes),which was increased to 2.5 times that of carbon dots.Furthermore,based on the environmental protection of raw materials and the excellent optical properties of carbon dots,it has shown potential application value in the fields of anti-counterfeiting and information encryption.

关 键 词：荧光 室温磷光 碳点 长寿命 防伪材料 

分 类 号：TB34[一般工业技术—材料科学与工程]