Method for preparing down-conversion fluorescent substrate material gadolinium sodium fluoride nanocrystalline

A technology of sodium gadolinium fluoride and matrix materials, which is applied in the field of preparation of down-conversion fluorescent matrix material sodium gadolinium fluoride nanocrystals, which can solve problems such as complex processes and achieve good repeatability, stable product quality, and simple processes and equipment.

Inactive Publication Date: 2009-03-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on the preparation of sodium gadolinium fluoride nanomaterials, the process is more complicated, and the minimum preparation temperature is 90 ° C (J. Alloy. Compd. 2004, 380, 315-320), the obtained particle shape is basically spherical, with The expansion of the application field of down-conversion luminescent materials requires a simple method for preparation at room temperature

Method used

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  • Method for preparing down-conversion fluorescent substrate material gadolinium sodium fluoride nanocrystalline
  • Method for preparing down-conversion fluorescent substrate material gadolinium sodium fluoride nanocrystalline
  • Method for preparing down-conversion fluorescent substrate material gadolinium sodium fluoride nanocrystalline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Weigh 0.01mol of gadolinium oxide, add a sufficient amount of perchloric acid with a concentration of 2mol / L, heat to dissolve, add deionized water to be constant to 100ml, obtain 0.2mol / L gadolinium perchlorate solution, and use high Chloric acid or sodium hydroxide solution to adjust its pH to 2;

[0023] (2) Weigh 7.4448g of disodium edetate and dissolve it in 80ml of deionized water, and after fully dissolving, set the volume to 100ml to obtain a 0.2mol / L disodium edetate solution;

[0024] (3) Weigh 2.0999g of sodium fluoride and dissolve it in 80ml of deionized water, and after fully dissolving, set the volume to 100ml to obtain a 0.5mol / L sodium fluoride solution;

[0025] (4) Take 5ml of the solution in step (1) and 5ml of the solution in step (2) and mix evenly. After fully stirring, add 15ml of the solution in step (3) to it, and centrifuge after aging for 1 hour. Wash 3 times and dry in a vacuum oven at 60°C.

[0026] The X-ray diffraction pattern of th...

Embodiment 2

[0028] (1) Weigh 0.01mol of gadolinium oxide, add a sufficient amount of perchloric acid with a concentration of 2mol / L, heat to dissolve, add deionized water to be constant to 100ml, obtain 0.2mol / L gadolinium perchlorate solution, and use high Chloric acid or sodium hydroxide solution to adjust its pH to 2;

[0029] (2) Take 5.2938g of trisodium citrate and dissolve it in 80ml of deionized water, and after fully dissolving, set the volume to 100ml to obtain a 2mol / L trisodium citrate solution;

[0030] (3) Weigh 2.0999g of sodium fluoride and dissolve it in 80ml of deionized water, and after fully dissolving, set the volume to 100ml to obtain a 0.5mol / L sodium fluoride solution;

[0031] (4) Take 5ml of the solution in step (1) and 5ml of the solution in step (2) and mix evenly. After fully stirring, add 15ml of the solution in step (3) to it, and centrifuge after aging for 1 hour. Wash 3 times and dry in a vacuum oven at 60°C.

[0032] The X-ray diffraction pattern of the...

Embodiment 3

[0034] (1) Weigh 0.01mol of gadolinium oxide, add a sufficient amount of perchloric acid with a concentration of 2mol / L, heat to dissolve, add deionized water to be constant to 100ml, obtain 0.2mol / L gadolinium perchlorate solution, and use high Chloric acid or sodium hydroxide solution to adjust its pH to 2;

[0035] (2) Weigh 22.3344g of disodium edetate and dissolve it in 80ml of deionized water, and after fully dissolving, set the volume to 100ml to obtain a 0.6mol / L disodium edetate solution;

[0036] (3) Weigh 2.0999g of sodium fluoride and dissolve it in 80ml of deionized water, and after fully dissolving, set the volume to 100ml to obtain a 0.5mol / L sodium fluoride solution;

[0037] (4) Take 5ml of the solution in step (1) and 5ml of the solution in step (2) and mix evenly. After fully stirring, add 15ml of the solution in step (3) to it, and centrifuge after aging for 1 hour. Wash 3 times and dry in a vacuum oven at 60°C.

[0038] The transmission electron microsco...

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Abstract

The invention relates to a preparation method of down-conversion fluorescent matrix material gadolinium sodium fluoride nanocrystalline, comprising: (a) taking rare-earth gadolinium oxide as raw material which is dissolved in perchloric acid or hydrochloric acid so as to prepare gadolinium perchloric acid or gadolinium chloride solution; (b) preparing complexing agent solution with the concentration of 0.2 to 1.0 mol / L which is mixed with the solution prepared from step (a), and then adjusting the pH of the solution; the molar ratio of perchloric acid salt or hydrochloric acid salt to the complexing agent is 1:1 to 5; (c) preparing sodium fluoride aqueous solution, injecting the solution obtained from step (b) at 0 to 45 DEG C, and then aging for 1 to 5 hours; the molar ratio of sodium fluoride to the total rare earth ions in the solution is 1:1.2 to 30; and (d) separating the sediment and carrying out ultrasonic washing on the sediment which is then dried at 30 to 80 DEG C. The invention has the advantages of simple process and equipment, stable product quality and good repeatability; and the diameter of the used gadolinium sodium fluoride nanoparticles is 70 to 150nm.

Description

technical field [0001] The invention belongs to the field of preparation of sodium gadolinium fluoride nanometer materials, in particular to a method for preparing sodium gadolinium fluoride nanocrystals of a down-conversion fluorescent host material. Background technique [0002] In recent years, with the development of plasma flat panel display devices and the demand for mercury-free fluorescent lamps, people have paid great attention to fluorescent materials excited by vacuum ultraviolet rays. The energy of vacuum ultraviolet photons is relatively high, and even if the quantum efficiency of the fluorescent material is 100%, the energy efficiency of the device is still very low. In order to improve the energy efficiency of plasma flat panel display devices and mercury-free fluorescent lamps, it is necessary to use photon multiplication materials with quantum efficiency greater than 100%. [0003] With sodium gadolinium fluoride as the matrix and europium-doped down-conver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 周兴平单树楠倪似愚
Owner DONGHUA UNIV
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