Sensitized Upconversion Emissions of Tb3+ by Tm3+ in YF3 and NaYF4 Nanocrystals

被引：31

作者：

Wang, Lili ^{[1
,2
]}

Zhang, Daisheng ^{[2
]}

Zhao, Dan ^{[2
]}

Qin, Guanshi ^{[2
]}

Qin, Weiping ^{[2
]}

机构：

[1] Changchun Univ Technol, Sch Basic Sci, Changchun 130012, Peoples R China

[2] Jilin Univ, State Key Lab Integrated Optoelect, Coll Elect Sci & Engn, Changchun 130012, Peoples R China

来源：

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY | 2011年 / 11卷 / 11期

基金：

国家高技术研究发展计划(863计划); 中国国家自然科学基金;

关键词：

YF3; Tb; UC Luminescence; Nanocrystals; ET; CRYSTAL-STRUCTURE; LUMINESCENCE; ULTRAVIOLET; MICROCRYSTALS; FLUORESCENCE; GD3+; YB3+; NANOPARTICLES; IONS;

D O I：

10.1166/jnn.2011.5250

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Yb3+-Tm3+-Tb3+-codoped YF3 and NaYF4 nanocrystals (NCs) were synthesized using a simple hydrothermal method. Under 980 nm excitation, violet and ultraviolet upconversion (UC) emissions of D-5(3) -> F-7(J) (J = 6, 5, 4) and D-5(4) -> F-7(J) (J = 6, 5, 4, 3) of Tb3+ ions were observed with the fluoride NCs. In the Yb-Tm-Tb codoped NCs, energy transfer (ET) processes from Tm3+ to Tb3+ were proposed to be the main mechanisms for the UC emissions of Tb3+ ions. They are more efficient than the phonon assisted cooperative sensitization of the Yb3+ couple proposed previously for similar material system. The analysis of power dependence indicated that populating the D-5(4) level of the Tb3+ ions was a four photon UC process, which demonstrated the existence of the two step ET process of Yb3+ -> Tm3+ -> Tb3+. It was also found that UC luminescence properties of Tb3+ ions were sensitive to crystal structures.

引用

页码：9580 / 9583

页数：4

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