染料敏化增强Ho^3+单带上转换红光  

Enhancing Single-band Red Upconversion Luminescence of Ho^3+Through Dye-sensitization

作　　者：王丹[1,2,3] 薛彬 涂浪平[3] 张友林 宋军[1] 屈军乐[1] 孔祥贵[3] WANG Dan;XUE Bin;TU Lang-ping;ZHANG You-lin;SONG Jun;QU Jun-le;KONG Xiang-gui(Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,China;College of Information Engineering,Shenzhen University,Shenzhen 518060,China;State Key Laboratory of Luminescence and Applications,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China)

机构地区：[1]深圳大学物理与光电工程学院,光电子器件与系统教育部/广东省重点实验室,广东深圳518060 [2]深圳大学信息工程学院,广东深圳518060 [3]中国科学院长春光学精密机械与物理研究所,发光学及应用国家重点实验室,吉林长春130033

出　　处：《发光学报》2020年第9期1114-1121,共8页Chinese Journal of Luminescence

基　　金：国家重点基础研究发展计划(2018YFC0910602);国家自然科学基金(11874354,11874355,61605130,11604331,61775145,61835009);吉林省科技厅自然科学基金(20180101222JC);深圳市基础研究项目(JCYJ20180305125425815)资助。

摘　　要：单带上转换红光发射在高分辨生物标记及三维彩色显示方面具有重要应用。本文针对Ho^3+/Ce^3+共掺杂纳米体系单带上转换红光较弱的问题,设计制备了染料(IR-806)敏化的NaYF4∶Yb/Ho/Ce(20%/2%/10%)@NaYF4∶Nd(20%)纳米晶,显著增强了上转换红光发射。采用溶剂热法制备了均匀的上转换纳米粒子,通过调控核内部Ce^3+离子掺杂浓度比例(0~10%)逐步获得单带上转换红光发射。在此基础上,通过上转换纳米粒子表面连接近红外IR-806染料分子,808 nm激发下其上转换发光强度提高了约22倍,特别地,红绿荧光强度比从4.8增至8.4。结果表明,染料敏化可用于增强上转换单带红光发射,并提高红光色纯度,这有利于高清晰的生物成像应用。Single-band red upconversion emission has important applications for high-resolution biomarkers and 3-dimensional color display.However,the cross-relaxation of Ho^3+/Ce^3+co-doping system normally yield the weak single-band red emission.In this paper,the dye-sensitized NaYF4∶Yb/Ho/Ce(20%/2%/10%)@NaYF4∶Nd(20%)nanoparticles were prepared to address such an issue.Highly uniform upconversion nanoparticles were prepared by solvothermal method,and the single-band red emission was obtained by increasing the Ce^3+doping concentration(from 0%to 10%)inside the core.When the near-infrared dyes of IR-806 were further conjugated,the upconversion luminescence intensity exhibited a 22-fold enhancement,and the red-to-green emission ratio also increased from 4.8 to 8.4.This paper provides a new way to improve the intensity and the purity of single-band red upconversion luminescence through dye sensitization,which is beneficial to high-resolution bioimaging.

关 键 词：上转换发光 单带红光发射 染料敏化 纳米粒子 

分 类 号：O482.31[理学—固体物理]