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A preparation method of highly efficient luminescent oleic acid-coated rare earth calcium fluoride nanocrystals
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A technology of calcium earth fluoride and nanocrystals is applied in the field of preparation of oil-soluble rare earth nanocrystals, which can solve the problems of few reports and achieve the effects of good dispersibility, good dispersibility and high luminous intensity.
Inactive Publication Date: 2017-12-26
FOSHAN UNIVERSITY
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Problems solved by technology
Co-doped lithium ions with a very small ionic radius (Li + ) can simply and effectively enhance the luminescence of rare earth ions, but there are not many related reports
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Embodiment 1
[0029] A preparation method of rare earth calcium fluoride nanocrystals coated with oleic acid, the specific steps are as follows:
[0030] 1. Weigh 1.25mmol europium oxide powder with an electronic balance, heat and dissolve it in concentrated nitric acid, then volatilize the remaining nitric acid, add an appropriate amount of water and transfer it into a 50mL volumetric flask, and configure it into a 0.05mol / L europium nitrate aqueous solution; Weigh 20mmol of calcium chloride with an electronic balance, dissolve it in 50mL of water, and make a 0.4mol / L calcium chloride aqueous solution;
[0031] 2. Mix 3mL oleic acid, 10mL ethanol and 0.08g NaOH, and stir for 20 minutes to fully dissolve NaOH to obtain a clear solution;
[0032] 3. Slowly add 2.4mL of calcium chloride and 1mL of europium nitrate aqueous solution prepared in step 1 to the solution obtained in step 2, and stir for 20 minutes to obtain a white milky solution;
[0033] 4. Weigh 0.05mol of NH with an electronic...
Embodiment 2
[0037] Doped with Li + The preparation of ionic oleic acid coated rare earth calcium fluoride nanocrystals, the specific steps are as follows:
[0038] 1. Weigh 1.25mmol europium oxide powder with an electronic balance, heat and dissolve it in concentrated nitric acid, then volatilize the remaining nitric acid, add an appropriate amount of water and transfer it into a 50mL volumetric flask, and configure it into a 0.05mol / L europium nitrate aqueous solution; Weigh 20mmol of calcium chloride with an electronic balance, dissolve it in 50mL of water, and make a 0.4mol / L calcium chloride aqueous solution;
[0039] 2. Weigh 2.5 mol of lithium nitrate with an electronic balance, dissolve it in 50 mL of water, and prepare a 0.05 mol / L lithium nitrate aqueous solution.
[0040] 3. Mix 3mL oleic acid, 10mL ethanol and 0.08g NaOH, and stir for 20 minutes to fully dissolve NaOH to obtain a clear solution;
[0041] 4. Slowly add the mixed aqueous solution of 2.2mL calcium chloride, 1mL ...
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Abstract
The invention relates to a preparation method of an efficient luminous oleic-acid-coated rare earth calcium fluoride nanocrystal. Solvothermal reaction easy to operate is adopted, ethanol and water are adopted as a mixed solvent, oleic acid with a long alkyl chain is taken as a coating material, and oleic acid can control growth of the nanocrystal, so that the generated nanocrystal is easily soluble in a non-polar solvent. If Li<+> ions at a certain concentration are codoped, red characteristic luminous intensity of a europium doped calcium fluoride nanocrystal can be obviously enhanced. The preparation method is low in cost, easy to operate and applicable to preparation and luminescence enhancement of other oil soluble rare-earth nano luminescent materials. The obtained oleic-acid-coated rare earth nanocrystal has the characteristics of relatively uniform size, good dispersibility, strong oil solubility and high luminescent intensity. The high-luminous-efficiency and oleic-acid-coated rare earth nanocrystal can be compounded with other chemical substances to construct a novel multifunctional material and has broad application prospect in the aspects of organic optical waveguide devices, biological probes, medical diagnosis and treatment, photocatalysis and sensing.
Description
technical field [0001] The invention belongs to the technical field of preparation of inorganic nanometer materials, and in particular relates to a method for preparing monodisperse, high-efficiency light-emitting oil-soluble rare earth nanocrystals. Background technique [0002] In recent years, rare earth doped nanomaterials have attracted the attention of many scientists. Rare earth nanoluminescent materials have important applications in biomedicine, biomarkers, displays, catalysis, optical waveguides, and solar cells due to their narrow emission peaks, long excited state lifetimes, and good optical and chemical stability. value. Since calcium fluoride (CaF 2 ) has low phonon energy, Ca 2+ The ion radius is close to that of rare earth ions, and CaF 2 It has high transmittance in a wide range of wavelengths from ultraviolet (~200nm) to infrared (~10μm), so it is a very suitable host material for rare earth ion doping. In addition, the preparation of CaF 2 The precur...
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