Method for improving near-infrared emission intensity of up-conversion material

A technology for converting materials and emission intensity, applied in luminescent materials, chemical instruments and methods, nanotechnology, etc., to achieve simple and easy preparation process, improve imaging sensitivity and penetration depth, and reduce autofluorescence and scattering loss

Active Publication Date: 2020-12-01
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0010] The dye has a high extinction coefficient, which can effectively capture the energy of external excitation photons, and transfer the energy to the sensitized ion through fluorescence resonance energy transfer, thereby improving the efficiency of upconversion luminescence, but this method does not require the optimal design of the dye molecule structure and the choice of dye type needs to be further explored

Method used

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  • Method for improving near-infrared emission intensity of up-conversion material
  • Method for improving near-infrared emission intensity of up-conversion material
  • Method for improving near-infrared emission intensity of up-conversion material

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 1. Add 0.3011g (0.810mmol) GdCl 3 ·6H 2 O, 0.0013g (0.005mmol) Ga(NO 3 ) 3 , 0.0698g (0.18mmol) YbCl 3 ·6H 2 O, 0.0019g (0.005mmol) TmCl 3 ·6H 2 After O was dissolved in 20mL of absolute ethanol, pour it into a flask, add 0.85g (3mmol) stearic acid into it, raise the temperature to 70°C under vigorous magnetic stirring, reflux at constant temperature for 15min, and then slowly add 10mL of 0.3mol / L NaOH The aqueous solution takes about 30 minutes to add dropwise. After the dropwise addition, continue to reflux at 70°C for 100 minutes to obtain a white suspension. Then it was filtered under reduced pressure, and dried in an oven for 12 hours to obtain a rare earth stearate precursor.

[0029]2. Add the rare earth stearate precursor obtained in step 1, 10mL oleic acid and 10mL octadecene into a 100mL three-necked flask, and stir at 160°C for 60min under an anhydrous, oxygen-free, and argon protective atmosphere to form a uniform slightly Light yellow transparent so...

Embodiment 2

[0031] In this example, GdCl 3 ·6H 2 The amount of O was reduced to 0.805mmol, Ga(NO 3 ) 3 The consumption of increasing to 0.01mmol, other raw material consumption and process conditions are identical with embodiment 1, is prepared into NaGdF 4 : 18% Yb, 0.5% Tm, 1% Ga rare earth up-conversion luminescent material.

Embodiment 3

[0033] In this example, GdCl 3 ·6H 2 The amount of O was reduced to 0.785mmol, Ga(NO 3 ) 3 The consumption of increasing to 0.03mmol, the consumption of other raw materials and process conditions are identical with embodiment 1, is prepared into NaGdF 4 : 18% Yb, 0.5% Tm, 3% Ga rare earth up-conversion luminescent material.

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Abstract

The invention discloses a method for improving the near-infrared emission intensity of an up-conversion material. Ga<3+> is doped in the process of synthesizing the NaGdF4: 18%Yb and 0.5% Tm up-conversion material by adopting a solvothermal method, the NaGdF4: 18%Yb, 0.5%Tm and x%Ga<3+> rare earth up-conversion luminescent material is prepared, and the value of x is 0.5-5. The particle size of thematerial is 9-11 nm, the particle size is small, the morphology and size distribution is uniform, and the material can be used as a multi-mode biological imaging contrast agent for UCL imaging, MRI imaging and CT imaging. When Ga<3+> is doped into a matrix, fluorescence emission of Tm<3+> in a luminescence center at the near-infrared wavelength of 800 nm is remarkably enhanced, near-infrared light emission at the near-infrared wavelength of 800 nm has good penetrability to biological tissue, light damage to the biological tissue is small, and fluorescence imaging application of the material in a living body is facilitated. The development of the multimode imaging material has a potential application prospect in the field of biomedicine.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a method for improving the near-infrared emission intensity of an up-conversion material. Background technique [0002] Rare earth-doped upconversion nanoluminescent particles are an important class of luminescent materials, which can convert low-frequency excitation light into high-frequency emission light through a two-photon or multi-photon mechanism. In recent years, upconversion nanoparticles have attracted much attention as a new type of biomarker in biological applications. In addition, upconversion nanoparticles also have low toxicity, good stability, high luminous intensity, and large anti-Stokes shift. And other advantages, it has broad application potential in the fields of biomarkers and biodetection. In particular, the red light and near-infrared fluorescence emission of rare earth up-conversion luminescent materials, that is, the light in t...

Claims

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Application Information

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IPC IPC(8): C09K11/85B82Y20/00B82Y40/00
CPCC09K11/7773B82Y20/00B82Y40/00
Inventor 石峰高嘉忆刘苗莫秀兰武燕龙王婷婷
Owner SHAANXI NORMAL UNIV
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