稀土上转换发光微纳材料的光物理研究  

Studies on Photophysical Properties of Nanoscale and Microscale Rare-Earth-Doped Upconverting Materials

作　　者：邓泽宇 杨小涵 张锦文[1,2] 赵浩然 韩铱沆[1,2] 董浩 沈杰 Deng Zeyu;Yang Xiaohan;Zhang Jinwen;Zhao Haoran;Han Yihang;Dong Hao;Shen Jie(School of Materials Science and Engineering,Peking University,Beijing 100871,China;College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China)

机构地区：[1]北京大学材料科学与工程学院,北京100871 [2]北京大学化学与分子工程学院,北京100871

出　　处：《中国激光》2023年第1期62-74,共13页Chinese Journal of Lasers

摘　　要：稀土类发光材料由于其丰富的光学特性而具有重要的研究与应用价值。其中,稀土上转换发光材料在近年来尤为受人瞩目,与之相关的研究成果遍布物理、化学、生物、材料和多个交叉领域。有别于大多数发光材料的共性,上转换材料的激发-发射谱峰波长呈现为反斯托克斯位移,因此能够在短波长谱带范围绕过背景噪声且传输发光信息。作为对这一光物理机制的理解运用,人们通过化学方法合成了纳米尺度的稀土上转换发光材料,并且在生物样品荧光显微成像中成功证实了上转换发光标记物的高信噪比检测。以上转换发光微纳材料的光物理性质研究为主题,介绍和梳理了稀土上转换纳米材料在偏振光谱解析、单纳米颗粒超分辨发光成像、微型激光器构筑方面的研究进展。Significance Rare earth(RE)doped luminescent materials are essentially important for application and research purposes due to their diverse optical properties.Rare-earth-doped upconverting materials,in particular,have piqued the majority of research interest from physics,chemistry,material engineering,biomedicine,and related fields.Photon upconversion refers to a nonlinear optical mechanism that converts two or more low-energy photons into one high-energy photon.The ladder-like energy levels rising from 4f electron configurations of lanthanide ions could stabilize both intermediate and high excited states for photon upconversion.Thus,the upconverting luminescent efficiency of lanthanide compounds could be several orders of magnitude higher than that of two-photon absorption and second harmonic generation mechanisms.Distinct from common phosphors with Stokes-shift photoluminescence,rareearth-doped upconverting materials exhibit intrinsic anti-Stokes shifts between emission and excitation bands.It means that upconverting photon signals and background noises have little overlap in luminescent spectra.Taking advantage of sophisticated nanochemistry methods,people have prepared various rare-earth-based upconverting nanoparticles and developed upconverting luminescent probes for biomedical imaging applications.Many systematic review articles have discussed upconverting nanomaterials in aspects of structural design,chemical preparation,surface modification,biomolecular labeling,and imaging settings.The general merits of upconverting nanoparticles and related bio-probes,such as low autofluorescence and large imaging depth,are well known to multidisciplinary researchers.However,pioneer applications of upconverting materials face some new challenges,including single nanoparticle detection,multi-dimensional signal coding,novel micro-device conception,and so on.To meet these challenges,researchers need to thoroughly understand and rationally engineer the photophysics properties of nano-and micro-sized upconverting materials.

关 键 词：材料 稀土上转换发光 发光偏振性 超分辨成像 微型激光 

分 类 号：TN244[电子电信—物理电子学]