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LiRE1F4:Yb, RE2, Cd@LiRE1F4 upconversion fluorescence nanometer material and its preparation method

A fluorescent nanomaterial, RE1-TFA technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems that affect the luminescence of core materials, core-shell lattice mismatch, core-shell multi-lattice, etc., to avoid difficult to remove , The preparation process is simple, the effect of fluorescence enhancement

Inactive Publication Date: 2017-11-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the shell matrix material of the heterostructure shell is different from the core matrix material, there is a large lattice mismatch between the core and the shell, which further leads to more lattice defects between the core and the shell, and these defects become new Luminescent quenching centers affect the luminescence of core materials

Method used

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  • LiRE1F4:Yb, RE2, Cd@LiRE1F4 upconversion fluorescence nanometer material and its preparation method
  • LiRE1F4:Yb, RE2, Cd@LiRE1F4 upconversion fluorescence nanometer material and its preparation method
  • LiRE1F4:Yb, RE2, Cd@LiRE1F4 upconversion fluorescence nanometer material and its preparation method

Examples

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Effect test

Embodiment 1

[0033] A method for preparing upconversion fluorescent nanomaterials with synergistic core-shell structure to prepare LiY 0.68 Yb 0.2 Er 0.02 Cd 0.1 f 4 @LiYF 4 For example, the specific steps are as follows:

[0034] (1) Mix lithium hydroxide (LiOH) with an appropriate amount of deionized water, stir and heat, then add trifluoroacetic acid (CF 3 COOH), after the solid is completely dissolved, a clear solution of 1mol / L Li-TFA is obtained; similarly, cadmium oxide (CdO) can be used to obtain 0.2mol / L Cd-TFA, and rare earth oxides can be used to obtain 1mol / L Li-TFA Y-TFA, 0.2mol / L Yb-TFA, 0.02mol / L ER-TFA.

[0035] (2) Measure the standard solution (Y-TFA+Yb-TFA+Er-TFA+Cd-TFA) with a total amount of 1 mmol according to the molar ratio Y:Yb:Er:Cd=0.68:0.2:0.02:0.01, and Put it into a three-necked flask together with 2mmol Li-TFA to form a transparent solution 1. Using the same method, put 3mmol Li-TFA and 1.5mmol Y-TFA into a three-necked flask together to form a transp...

Embodiment 2

[0043] A preparation method of up-conversion fluorescent nanomaterials with core-shell structure to prepare LiY 0.68 Yb 0.2 T m 0.02Cd 0.1 f 4 @LiYF 4 For example, the specific steps are as follows:

[0044] (1) Mix lithium hydroxide (LiOH) with an appropriate amount of deionized water, stir and heat, then add trifluoroacetic acid (CF 3 COOH), after the solid is completely dissolved, a clear solution of 1mol / L Li-TFA is obtained; similarly, cadmium oxide (CdO) can be used to obtain 0.2mol / L Cd-TFA, and rare earth oxides can be used to obtain 1mol / L Li-TFA Y-TFA, 0.2mol / L Yb-TFA, 0.02mol / L Tm-TFA.

[0045] (2) Measure the standard solution (Y-TFA+Yb-TFA+Tm-TFA+Cd-TFA) with a total amount of 1 mmol according to the molar ratio Y:Yb:Tm:Cd=0.68:0.2:0.02:0.01, and Put it into a three-necked flask together with 2mmol Li-TFA to form a transparent solution 1. Using the same method, put 3mmol Li-TFA and 1.5mmol Y-TFA into a three-necked flask together to form a transparent solu...

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Abstract

The invention relates to a core-shell structure LiRE1F4:Yb, RE2, Cd@LiRE1F4 upconversion fluorescence nanometer material with synergistic effect and its preparation method. The chemical expression formula of the material is LiRE10.78-xF4:20%Yb,2%RE2,xCd@LiRE1F4, wherein RE1 is matrix ion and selected from one of Y3+, Gd3+, Lu3+; RE2 is activated ion and selected from one of Er3+, Tm3+, Ho3+, Nd3+; x is valued from 0 to 78%. Through coating a bared core to be a core-shell structure, the synergistic effect of 'the sum of 1 plus 1 is more than 2' is realized, the fluorescence intensity is also significantly improved.

Description

technical field [0001] The invention belongs to the technical field of up-conversion luminescent materials, in particular to a core-shell structure LiRE with a synergistic effect 1 f 4 :Yb,RE 2 ,Cd@LiRE 1 f 4 Up-conversion fluorescent nanomaterial and its preparation method. Background technique [0002] The luminescence of rare earth luminescent nanomaterials is mainly based on the radiative luminescence of rare earth ions transitioning from a high energy level to a low energy level. However, as the particle size of the nanomaterial gradually decreases, the specific surface area gradually increases, and the surface effect is enhanced. The surface effect has a significant impact on the luminescence of the luminescent nanomaterial. Due to the increase of the specific surface area, the coordination number of the atoms on the surface of the nanoparticles is insufficient, and a large number of unsaturated bonds, vacancies, defects, etc. are generated on the surface of the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/85
CPCC09K11/025C09K11/7773
Inventor 王友法朱亦茹赵书文代澳炎
Owner WUHAN UNIV OF TECH
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