By a News Reporter-Staff News Editor at Science Letter -- Current study results on Nanocrystals have been published. According to news originating from Dalian, People's Republic of China, by NewsRx correspondents, research stated, "Here, hydro/solvent thermal method was applied to synthesize lanthanide doped NaYF4 upconversion nanoparticles (UCNPs). In order to overcome the quenching effect of (CH2)(n) due to their high energy stretching vibration, a series of new chelating ligands such as, butanoic acid, hexanoic acid, decanoic acid, and tetradecanoic acid were selected for hydrothermal synthesis of NaYF4:Yb, Er nanocrystals."
Our news journalists obtained a quote from the research from the Dalian University of Technology, "For comparison, commonly used oleic acid was also used as ligand for hydrothermal synthesis of UCNPs. The effect of the carbon chain length of chelating ligands on the NaYF4 nanocrystals' emission intensity was systematically investigated. It was found that relative short length of the carbon chain in chelating ligands resulted in enhancement of luminescent intensity and modulation of the ratios of green to red (RGR) of NaYF4:Yb, Er nanocrystals. In contrast to the product prepared with oleic acid as ligand, the enhancement factors of 540 nm emissions were 25, 21, 6.5, and 3 for samples prepared with butanoic acid, hexanoic acid, decanoic acid, and tetradecanoic acid as ligands, respectively. The FT-IR spectra of NaYF4:Yb, Er UCNPs prepared with different ligands indicated that ligands with relatively short chain length indeed have weak IR absorption in 2800-2950 cm(-1), which resulted in weak quenching effect of Er3+. We also synthesized NaYF4:Yb, Tm UCNPs with these ligands. The results showed that chain length of ligands has similar effect on emission intensity of NaYF4:Yb, Tm."
According to the news editors, the research concluded: "It is expected that this method can also be applied to enhance the luminescence intensity of other luminescent materials."
For more information on this research see: Upconversion photoluminescence enhancement and modulation of NaYF4:Yb, Er through using different ligands. Journal of Luminescence, 2013;143():492-497. Journal of Luminescence can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Journal of Luminescence - www.elsevier.com/wps/product/cws_home/505700)
The news correspondents report that additional information may be obtained from S.L. Wu, Dalian University of Technology, State Key Lab Fine Chem, Dalian 116024, People's Republic of China. Additional authors for this research include Y.H. Ning, J. Chang and S.F. Zhang (see also Nanocrystals).
Keywords for this news article include: Asia, Dalian, Nanotechnology, Emerging Technologies, People's Republic of China
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