Issue 4, 2015

Shape-controllable synthesis and enhanced upconversion luminescence of Li+ doped β-NaLuF4:Yb3+,Ln3+ (Ln = Tm, Ho) microcrystals

Abstract

The applications of upconversion (UC) materials are still restricted due to their low upconversion luminescence efficiency. In this work, β-NaLuF4 microcrystals microcrystals with different morphologies and Li+ doped β-NaLuF4:Yb3+,Ln3+ (Ln = Tm, Ho) microcrystals were synthesized by a hydrothermal method using citric acid as a chelating agent. Hexagonal microtubes, hexagonal microprisms with scrappy ends, hexagonal microprisms, and hexagonal microdisks were obtained by simply adding different amounts of NaOH in the initial reaction solution. Li+ doped β-NaLuF4:Yb3+,Ln3+ (Ln = Tm, Ho) microcrystals were successfully prepared for the first time. Compared to their Li+-free counterpart, upconversion luminescence intensities of blue emission (477 nm) in β-NaLuF4:Yb3+,Tm3+ microcrystals doped with 15 mol% Li+ are enhanced by 6 times, green emission (538 nm) and red emission (644 nm) in β-NaLuF4:Yb3+,Ho3+ microcrystals doped with 15 mol% Li+ are enhanced by 7 and 3 times, respectively. The effect of Li+ on the enhancement of upconversion emission intensity is discussed systematically. The results suggest that the enhanced upconversion luminescence intensity of Li+ doped β-NaLuF4:Yb3+,Ln3+ (Ln = Tm, Ho) microcrystals may have potential applications in optoelectronic devices such as photovoltaic and plasma display panel devices.

Graphical abstract: Shape-controllable synthesis and enhanced upconversion luminescence of Li+ doped β-NaLuF4:Yb3+,Ln3+ (Ln = Tm, Ho) microcrystals

Article information

Article type
Paper
Submitted
10 Dec 2014
Accepted
12 Jan 2015
First published
13 Jan 2015

New J. Chem., 2015,39, 2565-2572

Shape-controllable synthesis and enhanced upconversion luminescence of Li+ doped β-NaLuF4:Yb3+,Ln3+ (Ln = Tm, Ho) microcrystals

H. Lin, D. Xu, D. Teng, S. Yang and Y. Zhang, New J. Chem., 2015, 39, 2565 DOI: 10.1039/C4NJ02257B

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