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Rare earth ion doped fluoride nanocrystals Preparation and luminescent properties

Author: CuiYang
Tutor: FanXianPing
School: Zhejiang University
Course: Materials Physics and Chemistry
Keywords: Fluoride Nanocrystals Upconversion luminescence Rare earth doped Coprecipitation Hydrothermal method
CLC: TB383.1
Type: Master's thesis
Year: 2006
Downloads: 431
Quote: 3
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Abstract


Biosensors and biological fluorescence labeling materials research progress, comparative analysis of the advantages and disadvantages of the various types of markers, review the direction of the development of fluorescent markers, Preparation of nanometer light-emitting materials and basic theory of upconversion luminescence. On this basis, the use of co-precipitation method, a hydrothermal synthesis method, etc. synthesis techniques to prepare a rare earth ion doped yttrium fluoride (YF 3 ) nanocrystals and yttrium fluoride, barium (BAY 2 F 8 ) nanocrystals. Application XRD, TEM, fluorescence spectroscopy testing techniques more systematic study of the rare earth ion doped yttrium fluoride nanocrystals doped rare earth ion concentration, synthesis conditions and yttrium barium fluoride nanocrystals particle morphology, size and luminescent properties the impact of the law. In this paper, the synthesis and luminescence properties of trivalent rare earth ion doped YF 3 nanoparticles. By the to the earth chlorides (YCl 3 · nH 2 O LnCl 3 the 2 O) and fluoride ammonium (NH 4 F) mixed in the 180 ° C autoclave hydrothermal treatment or from 400 ° C to 600 ° C at atmospheric pressure annealing heat treatment can be prepared by the rare earth ion doping YF 3 nanoparticles. X-ray diffraction showed that the synthesis of the second phase component of the rare-earth ion doped orthogonal YF 3 nanoparticles the of Eu 3 the ion doping the YF 3 nanocrystals Y- 1-x the of Eu x F 3 (x = 0 to 0.4) in the form of a solid solution, the luminous intensity Eu 3 ion doping amount increases gradually enhanced when Eu 3 concentrations up to 30 mol%, due between adjacent the of Eu 3 resonance energy transfer to the emergence of luminescence quenching. The 980nm excitation can be observed to Er 3 / Yb 3 codoped the YF of 3 nanoparticles on conversion luminescence. With the temperature increasing, Er 3 / Yb 3 codoped YF 3 nanoparticles size and upconversion fluorescence intensity gradually increases. The BaY 2 application hydrothermal and coprecipitation at codoped the Eu 3 ion doping and of Er 3 / Yb 3 F 8 crystal. Findings, synthesized by hydrothermal method and co-precipitation method the BaY 2 the F 8 and only in the heat treatment of 800 ° C into monoclinic BaY 2 F 8 crystal. Only present as CaF 2 -type cubic crystal structure in the heat treatment below 800 ℃. Eu 3 ion doped yttrium-barium fluoride nanocrystals, with the heat treatment temperature increases, the particle size increased significantly, the spectrum of the spectral splitting is more pronounced. Ethanol solvent synthesis of yttrium barium fluoride nanocrystals synthesized in water as solvent of yttrium barium fluoride nanocrystals 5 D 0 → 7 5 F 1 0 → 7 F 2 of between emission peak integral intensity ratio significantly different. The heat treatment temperature of Er 3 / Yb 3 co-doped fluoride yttrium barium nano crystal morphology and upconversion luminescence important influence, with the improvement of the heat treatment temperature, the nanoparticles increases rapidly in size, its upconversion luminescence intensity gradually increased. 980nm excitation the monoclinic the BaY 2 F 8 crystals the unaided eye bright green luminescence was observed at room temperature; while CaF 2 -type cubic crystal structure at room temperature can be observed by the naked eye to the red light emission and green light emission.

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