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Orthogonal emission rare earth upconversion nanoparticles controlled by lattice defects 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: 2020-10-16
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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  • Orthogonal emission rare earth upconversion nanoparticles controlled by lattice defects and preparation method
  • Orthogonal emission rare earth upconversion nanoparticles controlled by lattice defects and preparation method
  • Orthogonal emission rare earth upconversion nanoparticles controlled by lattice defects and preparation method

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Experimental program
Comparison scheme
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 thermal decomposition 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 in a ratio of 0.02mmol: 0.4mmol: 0.18mmol: 0.4mmol, and add them to the reactor to heat up Incubate for 8-10 hours at 150-200°C, cool to room temperature after the reaction, add ethanol and centrifuge, add the obtained particles to the mixed solution of oleic acid (5-10ml) and octadecene (10-20ml), and heat to 250 After reacting at -300°C for 1 hour, it was cooled to room temperature, and ethanol was added for centrifugal washing to obtain nuclear layer nanoparticles.

[0042] 2) Mix yttrium acetate and ytterbium acetate with 5-10ml oleic acid and 10-20ml octadecene acc...

Embodiment 2

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

[0047] 1) Add erbium acetate, thulium acetate and ytterbium acetate according to the molar percentage of 0.495mmol: 0.005mmol: 0.5mmol, mixed with 5-10mL oleic acid and 10-20mL octadecene into the flask, and heated to 110℃ under magnetic stirring , And then vacuum to remove water and oxygen. Divide through N 2 , The temperature is raised to 100-150℃, and the reaction is kept for 30min; then cooled to room temperature, it will contain NaOH and NH 4 The methanol solution of F is added to the three-necked flask, the temperature is raised to 110°C, and the vacuum is applied to remove the methanol and oxygen; after all, pass N 2 Protect, heat up to 250-300°C, react for 0.5-1h; after the reaction, cool to room temperature, add appropriate ethanol and centrifuge to wash, to obtain Tm-doped nuclear layer nanopartic...

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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 under different excitation wavelengths by lattice defects, and a corresponding preparation method for orthogonal emitting rare earth upconversion nanoparticles. Background technique [0002] Rare-earth ion-doped up-conversion nanoparticles can absorb near-infrared light through a multiphoton process and emit visible light of a specific wavelength. This special up-conversion luminescence characteristic makes it show a broad application prospect in the field of biomedicine. Rare earth up-conversion luminescence process is usually related to doping in the host material (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.) are closely related, the sensitizer absorbs near-infrared excitation light (Yb 3+ Absorb 980nm excitation light...

Claims

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Application Information

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