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Infrared-excited fluorescence-lifetime-adjustable up-conversion nanocrystal material and preparing method thereof

A nanocrystal, fluorescence excitation technology, applied in luminescent materials, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as limited number of materials, limited space for tunable fluorescence lifetime, encoding type dependent resolution, etc. , to achieve the effect of broad application prospects

Inactive Publication Date: 2016-04-13
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Adjusting the particle size is mainly to change the reaction temperature and reaction time. Limited by the nucleation and growth conditions of upconversion materials, the number of materials with different lifetimes that can be prepared by this method is limited.
However, the adjustable space of the fluorescence lifetime of the material obtained by changing the dopant ion concentration is limited, and the encoding type depends on the resolution of the instrument.

Method used

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  • Infrared-excited fluorescence-lifetime-adjustable up-conversion nanocrystal material and preparing method thereof
  • Infrared-excited fluorescence-lifetime-adjustable up-conversion nanocrystal material and preparing method thereof
  • Infrared-excited fluorescence-lifetime-adjustable up-conversion nanocrystal material and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Preparation of the shell precursor.

[0027] Preparation of Y, Yb-OA (0.1M) precursor: take a 50mL three-neck round bottom flask as a reaction vessel, add 2.25mmolYCl in turn 3 , 0.25 mmol YbCl 3 , 10 mL oleic acid (OA), 15 mL octadecene (ODE). Heating to 140 °C for 1 hour under vacuum and magnetic stirring conditions finally yielded clear and transparent Y,Yb-OA (0.1M) precursors.

[0028] Preparation of Nd, Yb-OA (0.1M) precursor: The preparation of Nd, Yb-OA (0.1M) precursor is similar to the preparation of the above Y, Yb-OA (0.1M) precursor, the above 2.25 mmolYCl 3 , 0.25 mmol YbCl 3 Replaced with 2.25mmolNdCl respectively 3 , 0.25 mmol YbCl 3 .

[0029] Preparation of Na-TFA-OA (0.4M) precursor: Take a 25mL three-necked round-bottomed flask as a reaction vessel, add 4mmol sodium trifluoroacetate and 10mL oleic acid in sequence, dissolve at room temperature under vacuum and stirring conditions, and obtain a colorless, transparent and clear Na-TFA-OA pr...

Embodiment 2

[0040] (1) Preparation of the shell precursor.

[0041] Preparation of Y, Yb-OA (0.1M) precursor: Take a 100mL three-neck round bottom flask as a reaction vessel, add 2.25mmolYCl in turn 3 , 0.25 mmol YbCl 3 , 10 mL oleic acid (OA), 15 mL octadecene (ODE). Heating to 140 °C for 1 hour under vacuum and magnetic stirring conditions finally yielded clear and transparent Y,Yb-OA (0.1M) precursors.

[0042] Preparation of Nd, Yb-OA (0.1M) precursor: The preparation of Nd, Yb-OA (0.1M) precursor is similar to the preparation of the above Y, Yb-OA (0.1M) precursor, the above 2.25 mmolYCl 3 , 0.25 mmol YbCl 3 Replaced with 2.25mmolNdCl respectively 3 , 0.25 mmol YbCl 3 .

[0043] Preparation of Na-TFA-OA (0.4M) precursor: Take a 50mL three-necked round-bottomed flask as a reaction vessel, add 4mmol sodium trifluoroacetate and 10mL oleic acid in sequence, dissolve at room temperature under vacuum and stirring conditions, and obtain a colorless, transparent and clear Na-TFA-OA p...

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Abstract

The invention belongs to the technical field of nanometer biological materials and particularly relates to an infrared-excited fluorescence-lifetime-adjustable up-conversion nanocrystal material and a preparing method thereof. The fluorescence nanometer material is a core-shell structure nanocrystal material with one core and two shell layers, and is composed of the up-conversion fluorescent center core, the energy transmission layer and the energy absorption layer. The up-conversion fluorescent center core absorbs exciting light with the specific wavelength and emits visible light; the energy transmission layer transmits energy between the energy absorption layer and a visible light emitting layer, and the fluorescence lifetime of the material is regulated by changing the thickness of the energy transmission layer; the energy absorption layer absorbs the energy of infrared-excited light and transfers the energy to the energy transmission layer. Through the design of the three-layer structure, the energy transmission process from Nd<3+ >to Yb<3+> to Tm<3+> and the energy transmission process from Nd<3+> to Yb<3+> to Er<3+> are achieved, and in addition the fluorescence lifetime of the material can be regulated and controlled just by changing the thickness of the middle layer. The material can be applied to the fields of analysis and detection.

Description

technical field [0001] The invention belongs to the technical field of nano-biological materials, and in particular relates to an up-conversion nano-crystal material with adjustable fluorescence lifetime excited by 800nm ​​infrared light and a preparation method thereof. Background technique [0002] Optical coding plays a very important role in data storage, anti-counterfeiting, molecular probes and microsphere arrays, especially in the fields of life sciences, medical research and disease diagnosis. Researchers can obtain more information from biological samples in various complex biological systems, providing more scientific basis for the diagnosis and treatment of diseases. Fluorescent color coding is currently the most widely used method. For example, flow cytometers used in clinical practice use fluorescent dyes with different excitation and emission wavelengths for multiple detection, but this detection often requires multiple excitation lights, and the fluorescence ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85C09K11/02B82Y20/00B82Y30/00
CPCC09K11/7773B82Y20/00B82Y30/00C09K11/02
Inventor 张凡周磊
Owner FUDAN UNIV
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