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Rare earth ions doped Ba_ (0.65) Zr_ (0.35) F_ (2.70) upconversion nanocrystals Preparation and Characterization

Author: WangJingJing
Tutor: YangKuiSheng
School: Changchun University of Science and Technology
Course: Inorganic Chemistry
Keywords: Hydrothermal Upconversion Nanocrystalline Ba0.65Zr0.35F2.70
CLC: TB383.1
Type: Master's thesis
Year: 2008
Downloads: 92
Quote: 2
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Abstract


In this paper, hydrothermal method, EDTA as a complexing agent to prepare rare earth ion doped system Er 3 / Yb 3 , Ho 3 / Yb 3 of Ba 0.65 Zr 0.35 F 2.70 upconversion nanocrystals . Explore two Nanocrystals process to determine the optimal annealing temperature . And discussed the complexing agent EDTA on the particle size control ability . X-ray diffraction analysis , transmission electron microscopy , environmental scanning electron microscope sample phase , structure and morphology analysis, the samples are of the nanocrystals prepared . Using an excitation wavelength of 980nm semiconductor laser light source ; using Hitachi F-4500 spectrophotometer measurement sample upconversion emission spectra of different rare earth ions doping concentration on upconversion luminescence properties and studied the pump power and upconversion luminescence intensity of the relationship , by analyzing the output light intensity and the pump power double logarithmic curve to determine the photon emission process , testing theory and experiment are consistent. Discussed the rare earth ion ground state absorption , excited state absorption and energy transfer between rare earth ions relationship and discussed in detail upconversion mechanism .

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