Preparation method of tio2-based nanocrystal up-conversion luminescent material with core-shell structure

A technology of luminescent materials and core-shell structure, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve problems such as complex preparation methods, achieve high luminous efficiency, high luminous intensity, and improve efficiency

Inactive Publication Date: 2011-12-28
ZHEJIANG ORIENT CRYSTAL OPTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation methods of the above studies are more complicated
And so far, there is no core-shell TiO embedded in the amorphous matrix 2 Report on Nanocrystal-Based Upconversion Luminescent Materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Taking CH with purity above 99.5% 3 CH 2 OH is used as a solvent and contains Er 3+ Er(NO 3 ) 3 .5H 2 O solution and containing Yb 3+ Yb(NO 3 ) 3 .5H 2 Preparation of TiO embedded in amorphous matrix with O solution 2 :Er(1%)-Yb(5%) / MoO 3 Core-shell structured nanocrystals with TiO 2 :Er(1%)-Yb(5%) refers to Er in the reaction solution 3+ With Yb 3+ The doping mole ratios are 1% and 5% respectively.

[0020] First, give 44.5ml CH with a purity of 99.5% or more 3 CH 2 Add 0.5ml of acetic acid to OH, mix and stir for 5 minutes, then add 5ml of tetrabutyl titanate to it, after stirring for 10 minutes, Er(NO 3 ) 3 .5H 2 O and Yb(NO 3 ) 3 .5H 2 O solution is added to make Er 3+ With Yb 3+ The molar ratios in the reaction solution are respectively 1% and 5%, and they are stirred and mixed thoroughly to obtain molecular-level homogeneity in a short time. And take the whole system as the reaction system, and the reaction is in a closed system during the whole process. After the rea...

Embodiment 2

[0022] Taking CH with purity above 99.5% 3 CH 2 OH is used as a solvent and contains Er 3+ Er(NO 3 ) 3 .5H 2 O solution and containing Yb 3+ Yb(NO 3 ) 3 .5H 2 Preparation of TiO embedded in amorphous matrix with O solution 2 :Er(1%)-Yb(8%) / MoO 3 Core-shell structured nanocrystals with TiO 2 :Er(1%)-Yb(8%) refers to Er in the reaction solution 3+ With Yb 3+ The doping mole ratios are 1% and 8% respectively.

[0023] First, give 44.5ml CH with a purity of 99.5% or more 3 CH 2 Add 0.5ml of acetic acid to OH to adjust the PH value, mix and stir for 5 minutes, then add 7ml of tetrabutyl titanate to it, and after stirring for 10 minutes, Er(NO 3 ) 3 .5H 2 O and Yb(NO 3 ) 3 .5H 2 O solution is added to make Er 3+ With Yb 3+ The molar ratios in the reaction solution are respectively 1% and 8%, and they are stirred to make them fully mixed to obtain molecular level homogeneity in a short time. And take the whole system as the reaction system, and the reaction is in a closed system during th...

Embodiment 3

[0025] Taking CH with purity above 99.5% 3 CH 2 OH is used as a solvent and contains Er 3+ Er(NO 3 ) 3 .5H 2 O solution and containing Yb 3+ Yb(NO 3 ) 3 .5H 2 Preparation of TiO embedded in amorphous matrix with O solution 2 :Er(1%)-Yb(10%) / MoO 3 Core-shell structured nanocrystals, where TiO 2 :Er(1%)-Yb(10%) refers to Er in the reaction solution 3+ With Yb 3+ The doping mole ratios are 1% and 10% respectively.

[0026] First, give 44.5ml CH with a purity of 99.5% or more 3 CH 2 Add 0.5ml of acetic acid to OH to adjust the PH value, mix and stir for 5 minutes, then add 10ml of tetrabutyl titanate to it, and after stirring for 10 minutes, Er(NO 3 ) 3 .5H 2 O and Yb(NO 3 ) 3 .5H 2 O solution is added to make Er 3+ With Yb 3+ The molar ratios in the reaction solution are respectively 1% and 10%, and they are stirred and mixed thoroughly to obtain molecular level homogeneity in a short time. And take the whole system as the reaction system, and the reaction is in a closed system during...

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Abstract

The invention relates to the technical field of up-conversion luminescent materials, in particular to a method for preparing up-conversion luminescent materials. First, a TiO2:Er-Yb nanocrystalline up-conversion luminescent material embedded in an amorphous matrix is ​​prepared by a sol-gel method. , and then immerse the up-conversion luminescent material in a Mo(NO3)3 solution for chemical modification, and anneal at a temperature of 500-1000° C. to prepare a TiO2-based nanocrystal up-conversion luminescent material with a core-shell structure. On the one hand, the present invention uses the amorphous embedded in TiO2:Er-Yb nanocrystals to reduce the light scattering of TiO2:Er-Yb nanocrystals, and on the other hand, utilizes the shell formed by surface modification to reduce surface states to improve upconversion luminescence It not only has the advantages of simple operation, can greatly improve the luminous performance, obtain high luminous intensity and high brightness, but also has the advantages of high luminous efficiency, especially reduces the production cost and reduces the toxicity of organic solvents.

Description

Technical field [0001] The present invention relates to the technical field of up-conversion luminescent materials, in particular to a core-shell structured TiO embedded in an amorphous matrix 2 Preparation method of base nanocrystalline up-conversion luminescent material. Background technique [0002] Up-conversion luminescent materials have been widely used in the fields of short-wavelength lasers, sensors, flat panel displays, LED devices, bio-fluorescence markings, and military anti-counterfeiting in recent years. Especially in the application of biofluorescence labeling, the matrix material is required to have good biocompatibility, hydrophilicity and light stability. TiO 2 As a direct wide band gap semiconductor material, it has excellent properties such as non-toxic, environmental protection, and good stability. It has important application value in photoelectronic devices such as biodetectors, photocatalysis, and solar cells. Therefore, it is an ideal up-conversion lumin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/68
Inventor 李京波李庆跃李凯孟秀清韩聪池旭明李树深夏建白
Owner ZHEJIANG ORIENT CRYSTAL OPTICS
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