Enhanced red upconversion luminescence by codoping Ce3+ in β-NaY(Gd0.4)F4:Yb3+/Ho3+ nanocrystals

被引：101

作者：

Gao, Wei ^{[1
]}

Zheng, Hairong ^{[1
]}

Han, Qingyan ^{[1
]}

He, Enjie ^{[1
]}

Gao, Fangqi ^{[1
]}

Wang, Ruibo ^{[1
]}

机构：

[1] Shaanxi Normal Univ, Sch Phys & Informat Technol, Xian 710062, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2014年 / 2卷 / 27期

基金：

美国国家科学基金会;

关键词：

DOPED NANOCRYSTALS; EMISSION; MULTICOLOR; GREEN; SIZE; NANOPHOSPHORS; NAYF4-YB; ER; SPECTRA; PHASE; IONS;

D O I：

10.1039/c4tc00585f

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, hexagonal phase NaY(Gd-0.4)F-4:Yb3+/Ho3+ nanocrystals were obtained by solvothermal method. The upconversion emission tuning from green to red in NaY(Gd-0.4)F-4:Yb3+/Ho3+ nanocrystals was successfully achieved by replacing Y3+ ions in the nanocrystal structure with Ce3+ ions under 980 nm excitation. The red upconversion emission intensity was enhanced with Ce3+ concentration increasing. The output colors for the samples can be clearly observed in a confocal microscopy setup. It was found that two efficient cross-relaxation processes between Ho3+ and Ce3+ ions had been employed to enhance red emission and suppress green emission. The possible upconversion mechanisms and conversion efficiency between Ho3+ and Ce3+ ions were investigated in detail. In addition, the influence of the matrix and surface properties on the upconversion emission of the samples was also discussed. The red upconversion emission of Yb3+, Ho3+ and Gd3+ codoped nanocrystals in this work will have great potential applications in biological imaging, magnetic resonance imaging agents, and display and anti-counterfeiting applications.

引用

页码：5327 / 5334

页数：8

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