摘要
本文借助外延生长及离子掺杂技术,基于NaYbF4:2%Er3+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NaYbF4:2%Er3+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NaYbF4:2%Er3+@NaYbF4@NaYF4 核-壳-壳微米盘的上转换红光发射强度相比于NaYbF4:2%Er3+微米盘增强了 4.6倍,红绿比由 6.3提高至 8.1.当少量Ho3+离子引入到NaYbF4:2%Er3+@NaYbF4:2%Ho3+@NaYF4 核-壳-壳微米盘时,Er3+离子与Ho3+离子间相互作用的发生使其上转换红光发射强度相比于NaYbF4:2%Er3+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Er3+离子的红光发射增强主要源自于不同核壳结构中Yb3+离子的高效的能量传递有效促进了Er3+离子间的交叉弛豫、Er3+和Yb3+离子间反向能量传递及Ho3+离子向Er3+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.
Abstract
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 NaYbF4:2%Er3+ micron core-shell structures are constructed with the help of epitaxial growth technology,effectively improving the red up-conversion emission of Er3+ 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 near-infrared laser excitation,the red emission intensity of single NaYbF4:2%Er3+@NaYbF4@NaYF4 core-shell-shell microdisk is 4.6 times higher than that of NaYbF4:2%Er3+ micron disk,and the red-to-green ratio increases from 6.3 to 8.1.Meanwhile,Ho3+ ions are introduced into the NaYbF4:2%Er3+@NaYbF4:2%Ho3+@NaYF4 core-shell-shell microdisk,and the red emission intensity is nearly 6.7 times higher than that of single NaYbF4:2%Er3+ 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 Er3+ ions is mainly derived from the construction of different core-shell structures,which can effectively enhance the cross-relaxation between Er3+ ions,the energy back transfer between Yb3+ and Er3+ ions,and the energy transfer from Ho3+ ions to Er3+ 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.
基金项目
国家自然科学基金(12274341)
国家自然科学基金(12004304)
国家自然科学基金(12104366)
陕西省重点研发计划(2022SF-333)
陕西省重点研发计划(2023-YBGY-256)
陕西省自然科学基金重点项目(2022JZ-05)
陕西省自然科学基金青年基金(2022JQ-041)
陕西省教育厅服务地方专项(22JC-057)
西安市高等学校院所人才服务企业项目(23GXFW0089)
万方数据