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Dimmable rare earth doped lanthanum lithium molybdate fluorescent powder and preparation method thereof

A technology of rare earth doping and lanthanum molybdate, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of not widely used in industrial production, complicated operation, and small output, and achieve low cost, simple preparation process, and large output Effect

Inactive Publication Date: 2017-11-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional wet chemical preparation method has the disadvantages of large pollution (using acid or alkali), complicated operation, and small output, so it has not been widely used in industrial production

Method used

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  • Dimmable rare earth doped lanthanum lithium molybdate fluorescent powder and preparation method thereof
  • Dimmable rare earth doped lanthanum lithium molybdate fluorescent powder and preparation method thereof
  • Dimmable rare earth doped lanthanum lithium molybdate fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Using Li 2 CO 3 , La 2 o 3 、MoO 3 、Dy 2 o 3 and Eu 2 o 3 powder as raw material, where Li 2 CO 3 , La 2 o 3 、MoO 3 、Dy 2 o 3 and Eu 2 o 3 The molar ratio is 1: (1-x): 4: 0.05: x, x = 0.01mol, 0.05mol, 0.09mol, 0.13mol, 0.17mol; grind and stir the above raw materials for 30min to make them fully mixed;

[0033](2) The mixture is packed into a corundum crucible;

[0034] (3) Put the crucible into a high-temperature electric furnace, set the heating rate to 120°C / min, set the reaction temperature to 800°C, hold the temperature for 4h, and perform calcination in an air atmosphere;

[0035] (4) After the solid phase reaction is completed, the crucible is naturally cooled to room temperature, the product is taken out, ground for 20 minutes to form a powder, and the target product is obtained after passing through a 100-mesh sieve. 3+ The doping concentration is 5mol%, the Eu in the product 3+ The doping concentrations are 1mol%, 5mol%, 9mol%, 13mol%, 17...

Embodiment 2

[0040] (1) Using Li 2 CO 3 , La 2 o 3 、MoO 3 、Dy 2 o 3 and Eu 2 o 3 powder as raw material, where Li 2 CO 3 , La 2 o 3 、MoO 3 、Dy 2 o 3 and Eu 2 o 3 The molar ratio is 1: (1-x): 4: 0.05: x, x = 0.09; Grind and stir the above raw materials for 10 minutes to make them fully mixed;

[0041] (2) The mixture is packed into a corundum crucible;

[0042] (3) Put the crucible into a high-temperature electric furnace, set the heating rate to 120°C / min, set the reaction temperature to 600°C, 700°C, 750°C, 800°C, 850°C and 900°C, respectively, and set the holding time to 4h. Carry out calcination under air atmosphere;

[0043] (4) After the solid phase reaction is completed, the crucible is naturally cooled to room temperature, the product is taken out, ground for 20 minutes to form a powder, and the target product is obtained after passing through a 100-mesh sieve. 3+ The doping concentration is 5mol%, the Eu in the product 3+ The doping concentration is 9mol%.

[0...

Embodiment 3

[0046] (1) Using Li 2 CO 3 , La 2 o 3 、MoO 3 、Dy 2 o 3 and Eu 2 o 3 powder as raw material, where Li 2 CO 3 , La 2 o 3 、MoO 3 、Dy 2 o 3 and Eu 2 o 3 The molar ratio is 1: (1-x): 4: 0.05: x, x = 0.01; Grind and stir the above raw materials for 20 minutes to make them fully mixed;

[0047] (2) The mixture is packed into a corundum crucible;

[0048] (3) Put the crucible into a high-temperature electric furnace, set the heating rate to 120° C. / min, set the reaction temperature to 800° C., hold the temperature for 5 hours, and perform calcination in an air atmosphere;

[0049] (4) After the solid phase reaction is completed, the crucible is naturally cooled to room temperature, the product is taken out, ground for 30 minutes to form a powder, and the target product is obtained after passing through a 100-mesh sieve. 3+ The doping concentration is 5mol%, the Eu in the product 3+ The doping concentration is 1mol%.

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Abstract

The invention relates to dimmable rare earth doped lanthanum lithium molybdate fluorescent powder and a preparation method thereof. Li2CO3 powder, La2O3 powder, MoO3 powder, Dy2O3 powder and Eu2O3 powder are weighed in the mole rate being 1:(1-x):4:0.05:x, ground and stirred uniformly, and a reactant material is obtained, wherein x ranges from 0.01 to 0.17; the reactant material is calcined at 750-850 DEG C for 4-6 hours, and a reaction product is obtained; after the reaction product is cooled, the reaction product is taken out, ground and sieved, and the dimmable rare earth doped lanthanum lithium molybdate fluorescent powder is obtained. The fluorescent powder adopting a pure-phase substance structure is formed with a high-temperature solid phase method, raw materials are more widely sourced, the cost is lower, and no toxic organic matter is produced; under excitation of fixed wavelength, the developing range of the fluorescent powder can change in red and yellow light areas in a color coordinate graph by changing the doping concentration of Eu<3+> and using the energy transfer function between Dy<3+> and Eu<3+>, and the dimmable performance of the fluorescent powder is realized.

Description

technical field [0001] The invention belongs to the field of preparation of rare earth luminescent materials, in particular to a light-adjustable rare earth doped lanthanum lithium molybdate fluorescent powder and a preparation method thereof. Background technique [0002] Phosphor materials are composed of a matrix and an activator. The host is the main body of the luminescent material, which is a compound with a certain crystal structure and good stability. Doped rare earth ions are used as activators, and the amount of activators is generally very small, which partially replaces the ions on the original site in the host crystal in the luminescent material, making the crystal structure form impurity defects. There are many kinds of materials that can be used as the matrix. Among them, the double molybdate with scheelite structure has attracted widespread attention. This type of compound has good thermal, physical and chemical stability. Today, dimmable LED lamps have app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
Inventor 刘运王凯刘丁菡马随艳赵敏竹
Owner SHAANXI UNIV OF SCI & TECH
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