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Dysprosium-doped lanthanum lithium molybdate fluorescent powder and preparation method thereof

A technology of lanthanum lithium molybdate and fluorescent powder, which is applied in the field of dysprosium-doped lanthanum lithium molybdate phosphor and its preparation, which can solve the problems of expensive raw materials, long preparation time, and health hazards, and achieve low pollution and short reaction time , the effect of improving output efficiency

Inactive Publication Date: 2017-11-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, Jinsheng Liao et al. have prepared LiLa(MoO 4 ) 2 :Eu 3+ Phosphor powder, its luminescent properties have been studied (Optical Materials, 2012, 8(34), 1468); but the raw materials used in the sol-gel method are more expensive, some of which are organic, harmful to health, and the preparation time is longer

Method used

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  • Dysprosium-doped lanthanum lithium molybdate fluorescent powder and preparation method thereof
  • Dysprosium-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 and Dy 2 o 3 powder as raw material, where Li 2 CO 3 , La 2 o 3 、MoO 3 and Dy 2 o 3 The molar ratio is 1:(1-x):4:x, x=0.01mol, 0.03mol, 0.05mol, 0.07mol, 0.9mol, 0.11mol; grind and stir the above raw materials for 20min 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 concentrations are 1mol%, 3mol%, 5mol%, 7mol%, 9mol%, 11mol%, respectively.

[0036] figure 1 Dy in Example 1 3+ LiLa prepared with a ...

Embodiment 2

[0039] (1) Using Li 2 CO 3 , La 2 o 3 ,MoO 3 and Dy 2 o 3 powder as raw material, where Li 2 CO 3 , La 2 o 3 、MoO 3 and Dy 2 o 3 The molar ratio is 1:(1-x):4:x, x=0.05; Grind and stir the above raw materials for 10min to make them fully mixed;

[0040] (2) The mixture is packed into a corundum crucible;

[0041] (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;

[0042] (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%.

[0043] The obtained target product was tested, and it was found that from 750°C to 850°C, the strength ...

Embodiment 3

[0045] (1) Using Li 2 CO 3 , La 2 o 3 ,MoO 3 and Dy 2 o 3 powder as raw material, where Li 2 CO 3 , La 2 o 3 、MoO 3 and Dy 2 o 3 The molar ratio is 1: (1-x): 4: x, x = 0.01; Grind and stir the above raw materials for 20 minutes to make them fully mixed;

[0046] (2) The mixture is packed into a corundum crucible;

[0047] (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;

[0048] (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 1mol%.

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Abstract

The invention relates to dysprosium-doped lanthanum lithium molybdate fluorescent powder and a preparation method thereof. Li2CO3 powder, La2O3 powder, MoO3 powder and Dy2O3 powder are taken in the mole ratio being 1:(1-x):4:x, ground and stirred uniformly, and a reactant material is obtained, wherein x ranges from 0.01 to 0.11; the reactant material is calcined at the temperature of 750-850 DEG C for 4-6 h, and a reaction product is obtained; the reaction product is cooled, taken out to be ground and then sieved, and the dysprosium-doped lanthanum lithium molybdate fluorescent powder is obtained. The fluorescent powder adopting the pure phase substance structure is formed with a high-temperature solid phase method, raw materials are more widely sourced, the cost is relatively low, and no toxic organic matter is formed; compared with an existing wet chemistry method, the preparation method is simple, low in pollution and high in yield, no acid or alkali is used, and the yield efficiency is effectively improved.

Description

technical field [0001] The invention belongs to the field of preparation of rare earth luminescent materials, and in particular relates to dysprosium-doped lanthanum lithium molybdate fluorescent powder and a preparation method thereof. Background technique [0002] Inorganic rare earth luminescent materials are composed of matrix and 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. In the large family of...

Claims

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Application Information

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IPC IPC(8): C09K11/78
CPCC09K11/7776
Inventor 刘运王凯刘丁菡马随艳赵敏竹
Owner SHAANXI UNIV OF SCI & TECH
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