期刊
SMALL
卷 16, 期 43, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202003799
关键词
back-energy-transfer; cross-relaxation; luminescence; NaHoF4; nanoparticles; surface quenching; upconversion
类别
资金
- National Natural Science Foundation of China [NSFC 51972075, 51720105015, 51772059, 51929201, 51972076]
- Special Innovation Talents of Harbin Science and Technology [2017RAQXJ171]
- Postdoctoral Scientific Research Developmental Fund [LBH-Q18034]
- Fundamental Research Funds for the Central Universities
It is absolutely imperative for development of material science to adjust upconversion luminescence (UCL) properties of highly doped upconversion nanoparticles (UCNPs) with special optical properties and prominent application prospects. In this work, featuring NaHoF4@NaYbF4(Ho@Yb) structures, sub-30 nm core-multishell UCNPs are synthesized with a small NaHoF(4)core and varied Gd3+/Yb(3+)coexisting shells. X-ray diffraction, transmission electron microscopy, UCL spectrum, UCL lifetime, and pump power dependence are adhibited for characterization. Compared with the former work, except for a smaller total size, tunable emission in color from red to yellow to green, and intensity from low to stronger than that of traditional UCNPs is achieved for approximate to 10 nm NaHoF(4)core size by means of changing number of layers and Gd3+/Yb(3+)concentration ratios in different layers. Besides, simultaneously doping Ho(3+)into the shells will result in lowered UCL intensity and lifted green/red ratio. Surface energy loss and sensitizing energy supply, which can be modulated with inert shielding of Gd(3+)and sensitization of Yb3+, are proved to be the essential determinant. More UCL properties of these peculiar Ho@Yb UCNPs are uncovered and detailedly summarized, and the findings can help to expand the application scope of NaHoF(4)into photoinduced therapy.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据