High-strength rare earth-doped up-conversion luminescence nanometer material and preparation method thereof

A nano-material, rare earth doping technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of low efficiency, complicated operation, high cost, etc.

Inactive Publication Date: 2013-05-08
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although water-soluble upconversion luminescent nanomaterials can be obtained by ligand replacement or polymer coating, these methods are not only complicated to operate, but also have low efficiency and high cost.

Method used

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  • High-strength rare earth-doped up-conversion luminescence nanometer material and preparation method thereof
  • High-strength rare earth-doped up-conversion luminescence nanometer material and preparation method thereof
  • High-strength rare earth-doped up-conversion luminescence nanometer material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Take 2.5mL0.4M 78%Y(NO 3 ) 3 ,20%Yb(NO 3 ) 3 ,2%Er(NO 3 ) 3 Put the aqueous solution in a beaker, add 16mL of deionized water and 18.5mL of ethanol, then add 7ml of oleic acid, stir to form solution A. Weigh 504 mg of NaF and dissolve it in 10 mL of water and 10 mL of ethanol, and stir to form solution B. After stirring A for 30 minutes, add solution B dropwise to A under stirring. After the dropwise addition, sonicate for half an hour, transfer to a 75mL hydrothermal kettle, screw the lid on, and heat in an oven at a heating temperature of 200 degrees. React for 10 hours, cool down, pour off the supernatant, collect the solid below, wash twice with a mixture of ethanol and water, centrifuge, and dry to obtain NaYF complexed with oleic acid ligands 4 : Yb, Er.

Embodiment 2～7

[0082] Take 2.5mL0.4M 78%Y(NO 3 ) 3 ,20%Yb(NO 3 ) 3 ,2%Er(NO 3 ) 3 Put the aqueous solution in a beaker, add 14mL of deionized water and 16.5mL of ethanol, add 7ml of propionic acid, butyric acid, hexanoic acid, capric acid, myristic acid or oleic acid and 0.7g of NaOH, and stir to form solution A. Weigh 504 mg of NaF and dissolve it in 10 mL of water and 10 mL of ethanol, and stir to form solution B. After stirring A for 30 minutes, add solution B dropwise to A under stirring. After the dropwise addition, sonicate for half an hour, transfer to a 75mL hydrothermal kettle, screw the lid on, and heat in an oven at a heating temperature of 200 degrees. React for 7 hours, cool down, pour off the supernatant, collect the solid below, wash twice with a mixture of ethanol and water, centrifuge, and dry to obtain NaYF complexed with carboxylic acid ligands of different carbon chain lengths 4 : Yb, Er nanocrystals.

Embodiment 8～9

[0084] Take 2.5mL0.4M 78%Y(NO 3 ) 3 ,20%Yb(NO 3 ) 3 ,2%Er(NO 3 ) 3 Aqueous solution in a beaker, add 17.5mL of deionized water and 20mL of ethanol, add 1mmol of benzoic acid or salicylic acid to form solution A. Weigh 504 mg of NaF and dissolve it in 10 mL of water and 10 mL of ethanol, and stir to form solution B. After stirring A for 30 minutes, add solution B dropwise to A under stirring. After the dropwise addition, sonicate for half an hour, transfer to a 75mL hydrothermal kettle, screw the lid on, and heat in an oven at a heating temperature of 200 degrees. React for 7 hours, cool down, pour off the supernatant, collect the solid below, wash twice with a mixture of ethanol and water, centrifuge, and dry to obtain NaYF complexed with benzoic acid or salicylic acid 4 : Yb, Er nanocrystals.

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Abstract

The invention provides a method of improving luminous efficiency of a rare earth-doped up-conversion luminescence nanometer material through changing the usage of a ligand. According to the method, the synthesis adopts a hydrothermal-solvothermal method, an organic ligand is an organic compound such as monocarboxylic acid, dicarboxylic acid or polycarboxylic acid, and amine, the molar ratio of rare earth ions to the ligand is 2:1-1:100, the molar ratio of NaOH to the ligand is 0:1-1:1, water/alcohol, water/n-propanol alcohol, water/isopropyl alcohol, water/n-butyl alcohol, water/acetone or water/ethylene glycol is used as a solvent, the temperature ranges from 180-240 DEG C, the reaction time is 2-24h, and the F<->/Re value ranges from 4-12. With the method, the problems of selecting various ligands for synthesizing the up-conversion luminescence nanometer material, improving the luminous efficiency of the rare earth-doped up-conversion luminescence nanometer material, synthesizing the water-soluble up-conversion luminescence nanometer material, and the like can be mainly solved.

Description

technical field [0001] The invention relates to a high-intensity rare earth doped up-conversion luminescent nano material and a preparation method thereof, belonging to the field of nano material preparation. Background technique [0002] Rare earth-doped upconversion luminescent nanomaterials have unique luminescent properties, such as: rich optical properties, narrow emission peaks, high luminous color purity, long fluorescence lifetime, near-infrared excitation, etc., making them ideal for laser displays, optical data storage, etc. , biomarkers, solar cells, etc. have significant potential applications. The preparation methods of up-conversion luminescent materials are mainly divided into two types: high-temperature oil-phase method and hydrothermal-solvothermal method. There are fewer ligands to choose; while the hydrothermal-solvothermal method uses high temperature and high pressure methods to obtain high-quality nanoparticles. This synthesis method makes the reaction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06C09K11/85
Inventor 武素丽常杰张淑芬
Owner DALIAN UNIV OF TECH
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