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Lattice defect-control orthogonal-emission rare earth upconversion nanoparticle and preparation method

A technology of rare earth up-conversion and nano-particles, which is applied in the field of nano-materials and achieves the effect of broad application prospects

Active Publication Date: 2018-08-24
合肥亨纳生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no suitable method or material that can effectively regulate the energy transfer pathway of the same rare earth activator under different excitation conditions, so as to realize the regulation of its different emission colors.

Method used

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  • Lattice defect-control orthogonal-emission rare earth upconversion nanoparticle and preparation method
  • Lattice defect-control orthogonal-emission rare earth upconversion nanoparticle and preparation method
  • Lattice defect-control orthogonal-emission rare earth upconversion nanoparticle and preparation method

Examples

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Effect test

Embodiment 1

[0040] In this embodiment, the core layer particles are prepared by the hydrothermal method, and then the inner shell layer and the outer shell layer are wrapped on the core layer by the high-temperature pyrolysis method. The specific steps are:

[0041] 1) Stir and mix erbium acetate, yttrium acetate, ytterbium acetate and manganese acetate with sodium fluoride, oleic acid, sodium hydroxide and ethanol according to the ratio of 0.02mmol: 0.4mmol: 0.18mmol: 0.4mmol, and add it to the reaction kettle to heat up to 150-200°C, keep warm for 8-10 hours, cool to room temperature after the reaction, add ethanol and centrifuge, add the obtained particles into a mixed solution of oleic acid (5-10ml) and octadecene (10-20ml), and heat up to 250 -300°C, react for 1 hour, then cool to room temperature, add ethanol and centrifuge to wash to obtain core layer nanoparticles.

[0042] 2) Mix yttrium acetate and ytterbium acetate according to the molar percentage of 0.9mmol: 0.1mmol, mix with...

Embodiment 2

[0046] In this example, the above-mentioned rare earth up-conversion nanoparticles were prepared by a high-temperature pyrolysis coating method, and the specific steps were as follows:

[0047] 1) Mix erbium acetate, thulium acetate and ytterbium acetate in molar percentages of 0.495mmol: 0.005mmol: 0.5mmol, mix with 5-10mL oleic acid, 10-20mL octadecene, and heat up to 110°C under magnetic stirring , and then vacuum to remove water and oxygen. N 2 , heat up to 100-150°C, keep warm for 30 minutes; then cool to room temperature, will contain NaOH and NH 4 Add the methanol solution of F into a three-necked flask, heat up to 110°C, and vacuum to remove methanol and oxygen; 2 Protect, raise the temperature to 250-300°C, and react for 0.5-1h; after the reaction, cool to room temperature, add appropriate ethanol and centrifuge to wash to obtain Tm-doped core layer nanoparticles.

[0048] 2) Add yttrium acetate and ytterbium acetate to 0.9mmol:0.1mmol according to the molar percen...

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Abstract

The invention discloses a lattice defect-control orthogonal-emission rare earth upconversion nanoparticle and a preparation method. Through co-doping of metal ions such as Mn<2+> and Tm<3+> with Er<3+> ion as a luminescent center, defects are introduced into lattices of an upconversion nanomaterial, and the pathways of energy transmission under 980nm excitation and 808nm excitation are controlled,wherein under 980nm laser excitation, the pathway of the energy transmission is Yb<3+> to Er<3+> to Mn<2+>(Tm<3+>) and red fluorescence is emitted, and under 808nm laser excitation, the pathway of the energy transmission is Nd<3+> to Yb<3+> to Er<3+> and green fluorescence is emitted. Through regulation of the doping amount of Mn<2+>, Tm<3+> or other metal ions, emission of the fluorescence withdifferent colors by the same luminescent center Er<3+> ion under different excitation wavelengths can be effectively controlled. The property of orthogonal emission of the same nanoparticle has a wideapplication prospect in the field of biomedicine.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a method for regulating the same rare earth ion to emit different colors at different excitation wavelengths by lattice defects, and a method for preparing the corresponding orthogonal emission rare earth up-conversion nanoparticles. Background technique [0002] Rare-earth ion-doped upconversion nanoparticles can absorb near-infrared light and emit specific wavelengths of visible light through a multiphoton process. This special upconversion luminescence characteristic makes it show broad application prospects in the field of biomedicine. Rare-earth upconversion luminescence processes are usually associated with doping in host materials (such as NaYF 4 、KYF 4 、LiYF 4 , NaGdF 4 etc.) in the sensitizer (such as Yb 3+ or Nd 3+ ) and activators (such as Er 3+ , Ho 3+ , Tm 3+ etc.), the sensitizer absorbs near-infrared excitation light (Yb 3+ Absorbs 980nm excitation light, Nd ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85
CPCC09K11/7773
Inventor 张勇
Owner 合肥亨纳生物科技有限公司
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