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Method for improving luminous efficiency by laser treatment of up-conversion nano material

A nano-material and laser processing technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of small high brightness and difficult preparation, and achieve the effects of enhancing luminous intensity, good shape, and improving up-conversion efficiency

Inactive Publication Date: 2019-11-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is difficult to prepare ultra-sm

Method used

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  • Method for improving luminous efficiency by laser treatment of up-conversion nano material
  • Method for improving luminous efficiency by laser treatment of up-conversion nano material
  • Method for improving luminous efficiency by laser treatment of up-conversion nano material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0036] Embodiment 1: A method for laser processing up-conversion of nanomaterials to improve luminous efficiency, the specific steps are as follows:

[0037] (1) Prepare the mixed rare earth nitrate solution of the rare earth matrix element (La), the rare earth luminescence center element (Er) and the rare earth sensitizer element (Yb): the oxide of the rare earth matrix element (La) 2 O 3 ), oxides of rare earth luminescence central elements (Er 2 O 3 ) And oxides of rare earth sensitizer elements (Yb 2 O 3 ) Was added to concentrated nitric acid (commercially available) and mixed uniformly, then heated at a constant rate to 200 ℃ and reacted at a constant temperature until crystals were produced, cooled to room temperature, then added deionized water and ultrasonicated for 10 min to obtain a mixed rare earth nitrate solution; The molar ratio of the rare earth matrix element, the rare earth luminescence center element and the rare earth sensitizer element is 78:2:20;

[0038] (2) M...

Example Embodiment

[0046] Embodiment 2: A method for laser processing up-conversion of nanomaterials to improve luminous efficiency, the specific steps are as follows:

[0047] (1) Prepare the mixed rare earth nitrate solution of the rare earth matrix element (Lu), the rare earth luminescence center element (Er) and the rare earth sensitizer element (Yb): the oxide of the rare earth matrix element (Lu) 2 O 3 ), oxides of rare earth luminescence central elements (Er 2 O 3 ) And oxides of rare earth sensitizer elements (Yb 2 O 3 ) Was added to concentrated nitric acid (commercially available) and mixed uniformly, then heated at a constant rate to 200 ℃ and reacted at constant temperature until crystals were produced, cooled to room temperature, then added deionized water and ultrasonicated for 30 min to obtain a mixed rare earth nitrate solution; The molar ratio of the rare earth matrix element, the rare earth luminescence center element and the rare earth sensitizer element is 78:2:20;

[0048] (2) Mix...

Example Embodiment

[0054] Embodiment 3: A method for laser processing up-conversion of nanomaterials to improve luminous efficiency, the specific steps are as follows:

[0055] (1) Prepare the mixed rare earth nitrate solution of the rare earth matrix element (Gd), the rare earth luminescent center element (Er) and the rare earth sensitizer element (Yb): the oxide of the rare earth matrix element (Gd) 2 O 3 ), oxides of rare earth luminescence central elements (Er 2 O 3 ) And oxides of rare earth sensitizer elements (Yb 2 O 3 ) Was added to concentrated nitric acid (commercially available) and mixed uniformly, then heated at a constant rate to 200°C and reacted at a constant temperature until crystals were produced, cooled to room temperature, then added deionized water and ultrasonicated for 30 minutes to obtain a mixed rare earth nitrate solution; The molar ratio of the rare earth matrix element, the rare earth luminescence center element and the rare earth sensitizer element is 78:2:20;

[0056] (2...

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Abstract

The invention relates to a method for improving luminous efficiency by laser treatment of an up-conversion nano material, and belongs to the technical field of preparation of a rare earth luminous material. The method comprises the following steps: preparing a mixed rare earth nitrate solution of a rare earth matrix element, a rare earth luminescent center element and a rare earth sensitizer element; uniformly mixing and dissolving oleic acid, ethanol and sodium hydroxide to obtain a solution A; adding the mixed rare earth nitrate solution into the solution A, uniformly mixing to obtain a solution B, and adding a NH4F solution into the solution B, and uniformly mixing to obtain a reaction system; reacting for 12-36 h under the condition of heating the reaction system at a constant speed tothe temperature of 160-200 DEG C, cooling the reaction system to the room temperature, carrying out solid-liquid separation, washing solids, and dispersing the solids into a cyclohexane solvent to obtain nanoparticle dispersion liquid; and uniformly coating the nanoparticle dispersion liquid to obtain a nanoparticle coating, focusing a laser beam on the nanoparticle coating, and crystallizing toobtain the up-conversion nano material with high luminous efficiency. According to the method, a surface amorphous layer is optimized through laser, and the up-conversion efficiency is improved.

Description

technical field [0001] The invention relates to a method for laser processing up-conversion nanometer materials to improve luminous efficiency, and belongs to the technical field of preparation of rare earth luminescent materials. Background technique [0002] Materials at the nanometer scale are generally readily prepared chemically, but chemically can result in incompletely formed bonds or fully crystalline ions. For the synthesis of up-conversion nanoparticles, a high specific surface area is obtained due to the small size, but more surface defect centers and more quenching are generated, which makes the luminous efficiency of the up-conversion nanoparticles relatively low. A post-treatment process is usually used to reduce the surface quenching point of the up-conversion to achieve high-efficiency up-conversion luminescence. [0003] At present, the method to optimize the luminous efficiency of intrinsic upconversion particles is to use annealing and build a core-shell ...

Claims

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Application Information

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IPC IPC(8): C09K11/85
CPCC09K11/7773
Inventor 徐旭辉雷静和文韬童茜袁志勇
Owner KUNMING UNIV OF SCI & TECH
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