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单颗粒NaYbF_(4):2%Er^(3+)@NaYbF_(4)核壳微米盘的上转换红光发射增强机理

Enhancement mechanism of red up-conversion emission in single NaYbF_(4):2%Er^(3+)@NaYbF_(4) micron core-shell structure
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摘要 本文借助外延生长及离子掺杂技术,基于NaYbF_(4):2%Er^(3+)微米晶体构建了多种不同的核壳微米盘,通过降低材料的表面猝灭效应及增强离子间的能量传递效应,实现了NaYbF_(4):2%Er^(3+)微米晶体上转换红光发射的增强.研究结果表明:在980 nm近红外激光激发下,构建的NaYbF_(4):2%Er^(3+)@NaYbF_(4)@NaYF_(4)核-壳-壳微米盘的上转换红光发射强度相比于NaYbF_(4):2%Er^(3+)微米盘增强了4.6倍,红绿比由6.3提高至8.1.当少量Ho^(3+)离子引入到NaYbF_(4):2%Er^(3+)@NaYbF_(4):2%Ho^(3+)@NaYF_(4)核-壳-壳微米盘时,Er^(3+)离子与Ho^(3+)离子间相互作用的发生使其上转换红光发射强度相比于NaYbF_(4):2%Er^(3+)微米盘增强了近6.7倍,且红绿比更是提高到9.4.通过对不同核壳微米盘光谱特性和发光动力学的研究,表明Er^(3+)离子的红光发射增强主要源自于不同核壳结构中Yb^(3+)离子的高效的能量传递有效促进了Er^(3+)离子间的交叉弛豫、Er^(3+)和Yb^(3+)离子间反向能量传递及Ho^(3+)离子向Er^(3+)离子间的能量传递的发生,进而提高了红光发射能级的粒子数布居.其研究可为构建具有高效红光发射的上转换微纳晶体提供新途径. The construction of core-shell structure can effectively reduce the quenching effect on the surface of material and regulate ion-ion interaction,which has become one of the effective ways to enhance and regulate the spectral characteristics of rare-earth upconversion luminescent materials.In this paper,a variety of NaYbF_(4):2%Er^(3+)micron core-shell structures are constructed with the help of epitaxial growth technology,effectively improving the red up-conversion emission of Er^(3+)ions.The prepared microcrystals with core-shell structures are of hexagonal phase microdisks,and their sizes are relatively uniform.In order to better obtain the material spectral data,a confocal microscopic spectroscopy is used to study spectral properties.Under 980 nm nearinfrared laser excitation,the red emission intensity of single NaYbF_(4):2%Er^(3+)@NaYbF_(4)@NaYF_(4) core-shell-shell microdisk is 4.6 times higher than that of NaYbF_(4):2%Er^(3+)micron disk,and the red-to-green ratio increases from 6.3 to 8.1.Meanwhile,Ho^(3+)ions are introduced into the NaYbF_(4):2%Er^(3+)@NaYbF_(4):2%Ho^(3+)@NaYF_(4) core-shell-shell microdisk,and the red emission intensity is nearly 6.7 times higher than that of single NaYbF_(4):2%Er^(3+)microdisk,and the red-to-green ratio increases from 6.3 to 9.4 through the interaction between ions.The microcrystal spectral characteristics and luminescence kinetics of different core-shell structures are studied,showing that the red emission enhancement of Er^(3+)ions is mainly derived from the construction of different core-shell structures,which can effectively enhance the cross-relaxation between Er^(3+)ions,the energy back transfer between Yb3+and Er^(3+)ions,and the energy transfer from Ho^(3+) ions to Er^(3+)ions.The micron core-shell structures with efficient red emission in this study has great application prospects in the fields of luminescence,anti-counterfeiting and optoelectronic devices.
作者 严学文 张景蕾 张正宇 丁鹏 韩庆艳 张成云 高伟 董军 Yan Xue-Wen;Zhang Jing-Lei;Zhang Zheng-Yu;Ding Peng;Han Qing-Yan;Zhang Cheng-Yun;Gao Wei;Dong Jun(School of Electronic Engineering,Xi’an University of Posts and Telecommunications,Xi’an 710121,China)
出处 《物理学报》 SCIE EI CAS CSCD 北大核心 2024年第5期147-156,共10页 Acta Physica Sinica
基金 国家自然科学基金(批准号:12274341,12004304,12104366) 陕西省重点研发计划(批准号:2022SF-333,2023-YBGY-256) 陕西省自然基金重点项目(批准号:2022JZ-05) 陕西省自然科学基金青年项目(批准号:2022JQ-041) 陕西省教育厅服务地方专项计划(批准号:22JC-057) 西安市高校院所人才服务企业项目(批准号:23GXFW0089)资助的课题.
关键词 上转换发光 核壳结构 能量传递 交叉弛豫 upconversion luminescence core-shell structure energy transfer cross-relaxation
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