800-nanometer continuous laser excited rare earth upconversion nanoparticles (UCNPs), and preparation method and application thereof

A rare earth up-conversion and nano-particle technology, applied in the field of nanoparticles, can solve the problems of low up-conversion efficiency, weak light absorption ability and damage of UCNPs, and achieve the effect of improving up-conversion fluorescence and avoiding quenching effect.

Active Publication Date: 2013-12-18
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this Yb-sensitized UCNPs has inherent defects: 1. Yb ions themselves do not have a strong light absorption ability in the infrared band, making the upconversion efficiency of UCNPs very low; 2. Since the absorption peak of Yb ions is located near 975nm, Therefore, the 980nm laser is curre

Method used

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  • 800-nanometer continuous laser excited rare earth upconversion nanoparticles (UCNPs), and preparation method and application thereof
  • 800-nanometer continuous laser excited rare earth upconversion nanoparticles (UCNPs), and preparation method and application thereof
  • 800-nanometer continuous laser excited rare earth upconversion nanoparticles (UCNPs), and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Example 1: Rare earth up-conversion nanoparticles NaYF 4 :Yb,ErNaYF 4 :YbNaNdF 4 :Yb

[0070] Will be stoichiometric ratio CF 3 COONa:(CF 3 COO) 3 Y:(CF3COO) 3 Yb:(CF 3 COO) 3 Er=1mmol:0.78mmol:0.2mmol:0.02mmol The prepared mixed powder was added to the mixed system of oleic acid (5-10mL) and octadecene (10-20mL), stirred at 120°C for 30min under vacuum, and then Under protection, the temperature was raised to 320°C and continued for 1h. After cooling, centrifuge, wash with ethanol for 1 to 2 times, and disperse with 2 mL of cyclohexane to obtain a dispersion ①.

[0071] Add the dispersion ① into the CF 3 COONa:(CF 3 COO) 3 Y:(CF3COO) 3 Yb=0.3mmol:0.27mmol:0.03mmol, in a mixed solution of oleic acid (10-20mL) and octadecene (10-20mL), stir at 120°C for 30min under vacuum, then raise the temperature to 300°C under argon protection and Last for 1h. After cooling, centrifuge, wash with ethanol for 1 to 2 times, and disperse with 2 mL of cyclohexane to obtain...

Embodiment 2

[0074] Example 2: Rare earth up-conversion nanoparticles NaYF 4 :Yb,TmNaYF 4 :YbNaNdF 4 :Yb

[0075] The same as the preparation method in Example 1, except that 0.02mmol (CF 3 COO) 3 Replace Er with 0.005mmol (CF 3 COO) 3 Tm.

Embodiment 3

[0076] Example 3: Rare earth up-conversion nanoparticles NaYF 4 :Yb,HoNaYF 4 :YbNaNdF 4 :Yb

[0077] The same as the preparation method in Example 1, except that 0.02mmol (CF 3 COO) 3 Replace Er with 0.005mmol (CF 3 COO) 3 Ho.

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Abstract

The invention provides 'core-shell-shell' rare earth upconversion nanoparticles (UCNPs) using Nd as a sensitizing agent. The rare earth UCNPs are characterized in that the shell layer of the rare earth UCNPs contains Nd<3+> and each layer contains Yb<3+>. The special microscopic nanostructure solves the problem about the quenching effect on upconversion fluorescence in an Nd doping process, so bright upconversion fluorescence can be obtained. Compared with the traditional Yb-sensitized UCNPs, the Nd-sensitized UCNPs have higher infrared absorption intensity so as to greatly improve upconversion efficiency and fluorescence. The Nd-sensitized UCNPs adopt 800-nanometer instead of 980-nanometer laser as an exciting light source, so the Nd-sensitized UCNPs have smaller overheating effect and stronger biological tissue penetrating power. Therefore, the novel rare earth upconversion material is expected to be widely applied in the field of biomedicines.

Description

technical field [0001] The invention relates to rare earth up-conversion nanoparticles (UCNPs) with a "core-shell-shell" structure using Nd as a sensitizer, a preparation method and application thereof, and belongs to the field of nanoparticles. Background technique [0002] As an important class of rare earth luminescent materials, rare earth up-conversion fluorescent materials can convert low-energy near-infrared light into high-energy visible light through a multi-photon absorption mechanism, so they are widely used in near-infrared lasers, solar cells, phosphors and Frontier fields such as sensors. In recent years, with the rapid development of nanotechnology, rare earth upconversion nanoparticles (UCNPs) have begun to show unique advantages in the fields of biological analysis and medical imaging: 1. Using 980nm near-infrared laser as the excitation light source, effectively avoiding the Autofluorescence of biological tissue and interference of scattered light; 2. Beca...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/85C09K11/78
Inventor 姚建年钟业腾马颖谷战军
Owner INST OF CHEM CHINESE ACAD OF SCI
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