Ren Jie, Li Chunxia, Shi Shuhui, Wang Mengyu, Zhang Siruo, Pan Yun, Li Junhong
College of Science and Aesthetic Education Center, Shenyang Institute of Engineering, Shenyang, 110136, China.
School of Public Finance and Taxation, Inner Mongolia University of Finance and Economics, Hohhot, 010070, Inner Mongolia, China.
J Fluoresc. 2025 Aug 13. doi: 10.1007/s10895-025-04476-8.
Rare earth-doped upconversion nanomaterials are one of the luminescent materials that have received extensive attention in recent years and have important applications in fields such as biomedicine, optoelectronic devices, and security inspection. In this study, for NaYF:Yb,Er upconversion nanoparticles, the effects of experimental parameters such as reaction temperature, reaction time, and the content of surfactants on their crystal phase, size, and morphology were systematically investigated. By adjusting the experimental parameters, the size of the hexagonal phase upconversion nanoparticles can be effectively controlled within the range of 18-71 nm. The study found that as the size of the nanoparticles increases, the upconversion luminescence intensity gradually increases. With the help of the first-principles theoretical calculations, an ion distribution model of upconversion nanoparticles varying with size was successfully constructed. Based on the model, the experimental scheme was optimized, and upconversion nanoparticles (UCNPs) with a size of 70.82 nm were prepared successfully. The luminescence intensity of the UCNPs was increased for about 6 times. Based on the above research, a near-infrared invisible dynamic response anti-counterfeiting label was prepared, and the optical response effect of the near-infrared detector based on upconversion nanoparticles was demonstrated. This work provides an important reference for the application of upconversion nanomaterials.
稀土掺杂上转换纳米材料是近年来受到广泛关注的发光材料之一，在生物医学、光电器件和安全检测等领域具有重要应用。在本研究中，针对NaYF:Yb,Er上转换纳米粒子，系统研究了反应温度、反应时间和表面活性剂含量等实验参数对其晶相、尺寸和形貌的影响。通过调整实验参数，可将六方相上转换纳米粒子的尺寸有效控制在18 - 71nm范围内。研究发现，随着纳米粒子尺寸的增加，上转换发光强度逐渐增强。借助第一性原理理论计算，成功构建了上转换纳米粒子尺寸变化的离子分布模型。基于该模型，优化了实验方案，成功制备出尺寸为70.82nm的上转换纳米粒子（UCNPs）。UCNPs的发光强度提高了约6倍。基于上述研究，制备了近红外不可见动态响应防伪标签，并展示了基于上转换纳米粒子的近红外探测器的光学响应效果。这项工作为上转换纳米材料的应用提供了重要参考。
