水溶性β-NaYF4:Tb^3+,Yb^3+@β-NaYF4核壳纳米颗粒的增强量子剪裁荧光  

Enhanced Quantum Cutting Fluorescence of Water-soluble β-NaYF_4:Tb^(3+),Yb^(3+)@β-NaYF_4 Core-shell Nanoparticles

作　　者：于志鹏[1,2] 林林[1,2] 王哲哲[1,2] 冯卓宏[1,2] 郑标[1,2] 杨开禧 郑志强[1,2] 

机构地区：[1]福建师范大学物理与能源学院、福建省量子调控与新能源材料重点实验室,福州350117 [2]福建省半导体光电材料及其高效转换器件协同创新中心,福建厦门361005

出　　处：《硅酸盐学报》2017年第4期523-528,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金青年基金(11204039,51202033);福建省自然科学基金(2015J01243,2016J01213);福建省教育厅A类科技项目(JA13084)

摘　　要：采用共沉淀法分别合成油性β-NaYF_4:Tb^(3+),Yb^(3+)和β-NaYF_4:Tb^(3+),Yb^(3+)@β-NaYF_4纳米颗粒,通过盐酸酸洗改性处理获得水性β-NaYF_4:Tb^(3+),Yb^(3+)和β-NaYF_4:Tb^(3+),Yb^(3+)@β-NaYF_4纳米核壳结构。表征了油性/水性纳米颗粒的形貌和量子剪裁近红外荧光发射性能。结果表明:制备的油性/水性β-NaYF_4:Tb^(3+),Yb^(3+)纳米颗粒呈球状,油性/水性β-NaYF_4:Tb^(3+),Yb^(3+)@β-NaYF_4纳米颗粒呈棒状;但水性纳米颗粒的尺寸均小于油性的;水性纳米颗粒在水溶液中具有良好的分散性。水性β-NaYF_4:Tb^(3+),Yb^(3+)@β-NaYF_4纳米颗粒溶液相比于相同溶液浓度和稀土掺杂浓度的油性β-NaYF_4:Tb^(3+),Yb^(3+)@β-NaYF_4和水性β-NaYF_4:Tb^(3+),Yb^(3+)纳米颗粒溶液,其量子剪裁荧光分别增强了1.6倍和3.4倍。这是由于β-NaYF_4隔离层的存在,改性既去除了油酸,又不会在发光中心附近产生缺陷,从而得到了较强的量子剪裁荧光。The oleate-capped β-NaYF4：Tb3＋,yb3＋ and β-NaYF4：Tb3＋,yb3＋@β-NaYF4 nanoparticles were prepared by a co-precipitation method. The ligand-free β-NaYFa：Tb3＋,yb3＋and β-NaYF4：Tb3＋,yb3＋@β-NaYF4 water-soluble core-shell nanoparticles were obtained via hydrochloric acid modification. The morphology and near-infrared quantum-cutting fluorescence properties were analyzed. The results show that the prepared oleate-capped/ligand-free β-NaYFa：Tb3＋,yb3＋ and β-NaYFa：Tb3＋,yb3＋@β-NaYF4 nanoparticles are ball-like and rod-like, respectively, and the size of ligand-free nanoparticles is smaller than that of the oleate-capped nanoparticles. The ligand-free nanoparticles can be well dispersed in water. The quantum cutting fluorescence of the ligand-free β-NaYF4：Tb3＋,yb3＋@β-NaYF4 core-shell nanoparticles solution is 1.6 times and 3.4 times greater than that of the oleate-capped β-NaYFa：Tba＋,yb3＋@β-NaYF4 and the ligand-free β-NaYF4：Tba＋,Yb3＋ nanoparticles solution at the same solution concentration and rare-earth doping amount, respectively. The enhancement of quantum-cutting luminescence is due to the presence of beta-NaYF4 shell, the modification removes the oleate ligand and prevents the generation of defects nearby the luminescence centers.

关 键 词：氟化钇钠 纳米颗粒 核壳结构 水性 量子剪裁 

分 类 号：O482.31[理学—固体物理]