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Beta-NaGdF4:Eu<3+> red fluorescent powder and preparation method thereof

A red phosphor, 3·6H2O technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as lack of preparation methods, and achieve the effects of simple operation method, high yield, excellent luminescence and paramagnetic properties

Active Publication Date: 2020-12-22
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still a lack of a simple preparation method that can simultaneously control rare earth doped NaGdF with different morphologies. 4 to meet the size requirements of the matrix material for specific applications such as luminescence and magnetism
In particular, using a single amino acid as an auxiliary agent can effectively control the rare earth doped NaGdF with various morphologies such as hierarchical structure and hollow structure. 4 method has not yet been reported

Method used

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  • Beta-NaGdF4:Eu&lt;3+&gt; red fluorescent powder and preparation method thereof
  • Beta-NaGdF4:Eu&lt;3+&gt; red fluorescent powder and preparation method thereof
  • Beta-NaGdF4:Eu&lt;3+&gt; red fluorescent powder and preparation method thereof

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preparation example Construction

[0033] A kind of β-NaGdF provided by the present invention 4 : Eu 3+ A preparation method for red fluorescence, comprising the steps of:

[0034] (1) Gd(NO 3 ) 3 ·6H 2 O and Eu(NO 3 ) 3 ·6H 2 O in H at a molar ratio of 2:1 2 O, and stirred at a temperature of 10-50°C to obtain the first solution;

[0035] (2) adding an aqueous solution of L-lysine with a concentration of 0.001-50 mmol / mL to the first solution and mixing to obtain a second solution;

[0036] (3) NaCl and NH with a molar ratio of 1:8 4 F is added to the second solution and mixed to obtain a third solution with a large amount of precipitation;

[0037] (4) putting the third solution into a polytetrafluoroethylene reactor, and performing a hydrothermal reaction at a reaction temperature of 90-200° C. to obtain a fourth solution;

[0038] (5) After the fourth solution is filtered, washed and dried in sequence, β-NaGdF is obtained 4 : Eu 3+ sample;

[0039] Wherein, by controlling the concentration of ...

Embodiment 1

[0048] A kind of β-NaGdF provided by this embodiment 4 : Eu 3+ A preparation method for red fluorescence, comprising the steps of:

[0049] (1) 0.2mmol Gd(NO 3 ) 3 ·6H 2 O and 0.1mmol Eu(NO 3 ) 3 ·6H 2 O in 50mL H 2 O, and stirred at a temperature of 30°C to obtain the first solution;

[0050] (2) Add 15 mL of an aqueous solution containing 4 mmol of L-lysine molecules to the first solution and mix to obtain a second solution;

[0051] (3) 1mmolNaCl and 8mmol NH 4 F is added to the second solution and mixed with a large amount of turbidity to obtain a third solution with a large amount of precipitation;

[0052] (4) Put the third solution into a polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at a reaction temperature of 180°C for 24 hours. At this time, whether the reaction raw materials are completely converted into pure phase β-NaGdF 4 , to obtain the fourth solution;

[0053] (5) Filter the fourth solution in turn, and after washing with di...

Embodiment 2

[0056] A kind of β-NaGdF provided by this embodiment 4 : Eu 3+ A preparation method for red fluorescence, comprising the steps of:

[0057] (1) 0.2mmol Gd(NO 3 ) 3 ·6H 2 O and 0.1mmol Eu(NO 3 ) 3 ·6H 2 O in 50mL H 2 O, and stirred at a temperature of 30°C to obtain the first solution;

[0058] (2) Add 10 mL of an aqueous solution containing 4 mmol of L-lysine molecules to the first solution and mix to obtain a second solution;

[0059] (3) 1mmolNaCl and 8mmol NH 4 F is added to the second solution and mixed with a large amount of turbidity to obtain a third solution with a large amount of precipitation;

[0060] (4) Put the third solution into a polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at a reaction temperature of 180°C for 24 hours. At this time, whether the reaction raw materials are completely converted into pure phase β-NaGdF 4 , to obtain the fourth solution;

[0061] (5) Filter the fourth solution in turn, and after washing with di...

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Abstract

The invention discloses beta-NaGdF4:Eu<3+> red fluorescent powder and a preparation method thereof. Beta-NaGdF4:Eu<3+> microcrystals are prepared by taking L-lysine as an auxiliary agent and adoptinga one-step hydrothermal method. The morphology of betaNaGdF4:Eu<3+> microcrystals is regulated and controlled by controlling the concentration of L-lysine molecules in an aqueous solution of L-lysineand the dosage of the aqueous solution of L-lysine, so that the beta-NaGdF4:Eu<3+> red fluorescent powder prepared by the method can meet special requirements on material structures in different purposes. In conclusion, the preparation method provided by the invention has the advantages of simple and convenient operation method, high yield and mild conditions, and has a large-scale production prospect, and the beta-NaGdF4:Eu<3+> red fluorescent powder prepared by the method has excellent luminescence and paramagnetic properties, and can be used as a luminescent material and a magnetic material.

Description

technical field [0001] The invention belongs to the technical field of luminescent material synthesis, in particular to a β-NaGdF 4 : Eu 3+ Red fluorescent powder and its preparation method. Background technique [0002] In recent years, fluoride materials doped with lanthanides have lower phonon energy, and have been attracting much attention in the fields of luminescent applications such as luminescence, biomarkers and displays. In numerous fluoride hosts, hexagonal phase rare earth doped NaGdF 4 It is an important fluoride luminescent substrate, and Gd under the excitation of specific wavelength 3+ Ions can act as intermediates (bridges) to transfer energy to their adjacent rare earth dopant ions, such as Eu 3+ , Tb 3+ and Dy 3+ etc., realize the conversion of radiant energy into other visible light, and thus provide the possibility for the preparation of high-efficiency new light-emitting materials. due to Gd 3+ Ion with seven unpaired electrons, rare earth doped...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85
CPCC09K11/7791
Inventor 徐燕刘鹏
Owner NORTHEASTERN UNIV LIAONING
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