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Rare-earth -doped fluoride nanocrystals Preparation and luminescent properties

Author: PiDaiBo
Tutor: FanXianPing
School: Zhejiang University
Course: Materials Physics and Chemistry
Keywords: Fluoride nanocrystals Photoluminescence Upconversion luminescence Coprecipitation Hydrothermal method
CLC: TB383.1
Type: Master's thesis
Year: 2005
Downloads: 347
Quote: 3
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Abstract


Summary bioluminescence analysis commonly used kinds of light-induced luminescence markers to introduce all kinds of rare earth fluorescent labeling substance research status and development trends, comparative analysis of the advantages and disadvantages of the various types of markers, review the direction of the development of fluorescent markers based on synthesis technology co-precipitation method, hydrothermal synthesis, the synthesis of the rare earth ion doped LaF 3 nano crystals and GdF 3 nanocrystals. Application of XRD, TEM, fluorescence spectroscopy, systematic testing techniques to study the rare-earth ion doping concentration, synthesis conditions, such as the rare-earth ion doped LaF 3 nano-crystals and the GdF 3 nanocrystal particle morphology, size and luminescent properties of law. Coprecipitation synthesized at room temperature Eu 3 doping of Er 3 / the Yb 3 co-doped and Tm / Yb 3 co-doped LaF 3 nanocrystals. The Eu 3 doped LaF is 3 nanocrystals excitation spectra and emission spectra show, Eu 3 in crystal the C 2 symmetry center. Eu 3 ions in the crystal of LaF 3 nano doping concentration may be as high as 60%, the formation of (La, Eu) F 3 solid solution. Eu 3 ion luminous intensity of the doped LaF 3 nanocrystals doped with Eu 3 ion increase gradually enhanced in the doping amount of 30 mol% maximum. Eu 3 ions highly excited the the quenched state level and Eu 3 plasma emission concentration quenching by cross relaxation. The heat treatment temperature of Er 3 / Yb 3 co-doped LaF 3 nanocrystals upconversion luminescence and near-infrared light-emitting important impact, with the heat treatment temperature upconversion luminescence intensity gradually increased, Er 3 / the Yb 3 co-doped LaF 3 nanocrystals enhanced. Hydrothermal synthesis method is applied for the first time synthesized rare earth doped GdF 3 nanocrystals, hydrothermal synthesis temperature of the rare earth doped GdF 3 nanocrystals preparation of decisive the role, and only when the hydrothermal synthesis temperature greater than 180 ° C in order to obtain a no impurity phase GdF 3 nanocrystals. Eu 3 doped GdF 3 nanocrystalline Gd 3 ions absorb the excitation light energy then transfers energy to the Eu 3 ion, leading Eu 3 and doped GdF 3 nanocrystals luminous efficiency. The 2mol% Er 3 and 6 mol% Yb 3 codoped GdF 3 nanocrystals observed effective upconversion luminescence and near-infrared light-emitting but the compared with GdF 3 bulk crystal, nanocrystals upconversion luminescence intensity weak.

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