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Title: Synthesis of LiYF 4, BaYF 5, and NaLaF 4 optical nanocrystals
Authors: Yi, G.S. 
Lee, W.B.
Chow, G.M. 
Keywords: Complex fluorides
Dynamic light scattering
Optical nanocrystals
Issue Date: Aug-2007
Citation: Yi, G.S., Lee, W.B., Chow, G.M. (2007-08). Synthesis of LiYF 4, BaYF 5, and NaLaF 4 optical nanocrystals. Journal of Nanoscience and Nanotechnology 7 (8) : 2790-2794. ScholarBank@NUS Repository.
Abstract: This paper reports the synthesis of high quality LiYF 4, BaYF 5, and NaLaF 4 nanocrystals by high-temperature co-decomposition of precursors in organic solvents. Their bulk counterparts have long been used as efficient luminescent hosts for various applications including lasers, upconversion fluorescence, and quantum cutters. The particles were characterized using TEM, XRD, dynamic light scattering (DLS), and fluorescence spectrometry. Trifluoroacetic acid (CF 3COOH) and the reaction temperature were crucial for the formation of NaLaF 4 and LiYF 4 nanoparticles. NaLaF 4 was not formed without using CF 3COOH, only LaF 3 and NaF mixture was formed. NaLaF 4 nanoparticles were obtained only when CF 3COOH was added in the reaction solution and the temperature was >330 °C. For the synthesis of LiYF 4, in the absence of CF 3COOH in the reaction, a mixture of YOF and LiYF 4 nanoparticles was formed. Pure LiYF 4 particles were obtained only until CF 3COOH was added in the reaction at 340 °C or above. The nanoparticles were easily dispersed in organic solvents include hexane, toluene, and chloroform and formed transparent colloidal solutions. The ease of doping of these as-synthesized host nanoparticles for designed optical properties was assessed. The LiYF 4, BaYF 5, and NaLaF 4 nanoparticles, co-doped with 20% Ytterbium (Yb) and 2% Erbium (Er), showed bright upconversion fluorescence upon 980 nm NIR excitation, confirming the high quality of as-synthesized nanoparticles. These nanoparticles are potential candidates for nano-optical devices, thin films, telecommunication, and bio-probes. Copyright © 2007 American Scientific Publishers All rights reserved.
Source Title: Journal of Nanoscience and Nanotechnology
ISSN: 15334880
DOI: 10.1166/jnn.2007.638
Appears in Collections:Staff Publications

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