Revisiting the NIR-to-Visible Upconversion Mechanism in β-NaYF4:Yb3+,Er3+

被引：202

作者：

Anderson, Robert B. ^{[1
]}

Smith, Steve J. ^{[1
]}

May, P. Stanley ^{[2
]}

Berry, Mary T. ^{[2
]}

机构：

[1] South Dakota Sch Mines & Technol, Rapid City, SD 57701 USA

[2] Univ S Dakota, Dept Chem, Vermillion, SD 57069 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2014年 / 5卷 / 01期

基金：

美国国家科学基金会;

关键词：

LUMINESCENCE EFFICIENCY; NANOCRYSTALS;

D O I：

10.1021/jz402366r

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

Here, we show that the long-accepted mechanism for the production of red and blue emission through upconversion (UC) of 1 mu m excitation in Yb3+/Er3+-doped materials does not apply in the popular beta-NaYF4 host. We propose a new mechanism involving Yb3+-to-Er3+ energy-transfer UC out of thegreen-emitting H-2(11/2), S-4(3/2) states that quantitatively accounts for all of the observed optical behavior. Rate constants for the relevant radiative and nonradiative processes are reported along with a prediction of the power dependence of the pulsed and continuous-wave UC quantum efficiency.

引用

页码：36 / 42

页数：7

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