发光学报2016，Vol.37Issue(9)：1056-1065,10.DOI:10.3788/fgxb20163709.1056
3d5金属离子共掺杂NaYF4∶Yb，Er纳米晶的上转换发光
Upconversion Luminescence of NaYF4∶Yb,Er Nanocrystals Co-doped with 3 d5 Metal Ions
摘要
Abstract
Mn2+/Fe3+ co-doped upconverting nanocrystals were prepared by hydrothermal method. The crystal phase, size and fluorescence intensity were modulated via changing the doping concen-trations. The maximum intensity of upconversion luminescence ( UCL) was observed in current work at the reaction time of 4 h when coating the silica shell of different thickness onto the NaYF4∶Yb, Er,Fe nanocrystals through facilely altering the reaction time. The integrated overall intensity of up-conversion luminescence was 3. 7 and 4. 5 times enhanced by co-doping Mn2+ and Fe3+, respective-ly. In particular, the red emission of NaYF4∶Yb,Er,Fe nanocrystals was 7 times intensified selec-tively compared to the green band of Er3+. The intensified visible UCL especially the dominant red emission is mainly ascribed to the energy transfer from 2 F7/2 , 4 T1g> ( Yb3+-Mn2+/Fe3+ dimer) to 4 F9/2 ( Er3+) states as well as the distortion of the crystalline field symmetry. The quenching of UCL as increasing dopants is stemming from the exchange interaction between 3d5 metal ions.关键词
上转换发光/过渡族离子/纳米核壳结构/能量传递Key words
upconversion luminescence/transition metal/core-shell nanostructures/energy transfer分类
数理科学引用本文复制引用
唐静,陈力,谢婉莹,刘玮洁,黄宇欣,李静,张立功,骆永石..3d5金属离子共掺杂NaYF4∶Yb，Er纳米晶的上转换发光[J].发光学报,2016,37(9):1056-1065,10.基金项目
国家自然科学基金(11474015，11504029)；吉林省教育厅2015科研规划资助项目 （11474015，11504029）
