聚苯乙烯
材料科学
光子上转换
发光
复合数
乳液聚合
纳米颗粒
纳米技术
化学工程
聚合物
聚合
光电子学
复合材料
工程类
作者
Jianxiong Xu,Mengjuan Hou,Yuneng Lu,Ling Yang,Jingjing Du,Na Li,Haihu Tan,Lijian Xu
标识
DOI:10.1016/j.reactfunctpolym.2022.105224
摘要
The design and fabrication of advanced materials with multiple optical states for constructing security code are of great value in anti-counterfeiting. Herein, novel upconversion photonic crystal (UCPC) films with tunable luminescence and structural color were prepared by vertical deposition of polystyrene encapsulated NaYF4:Ln3+ ([email protected]2/PS) composite microspheres. The composite microspheres were synthesized by sequential coating technology. Firstly, NaYF4:Ln3+@NaYF4 core/shell nanoparticles (CSNPs) were synthesized and served as upconversion luminescent emission centers. Then, the CSNPs were further coated by a SiO2 shell with pendant double bond to form [email protected]2-MPS. Afterward, mono-dispersed [email protected]2/PS composite microspheres were synthesized by emulsion polymerization of styrene in the presence of [email protected]2-MPS. By tailoring the doped lanthanide ions in CSNPs and adjusting the diameter of the composite microspheres, UCPC films with diverse upconversion fluorescence and structural color can be obtained. As a proof of concept, these different kinds of UCPC films were employed as information coding units to construct dual-mode anti-counterfeiting code. Our protocol provided a new security strategy for information storage.
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