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Alkaline earth metal tungstate/ molybdate red fluorescent powder and preparation method thereof

A technology of red fluorescent powder and alkaline earth metal, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of complicated follow-up process, large particle size of phosphor powder, irregular shape, etc., and achieve good crystallinity and coating performance , Uniform particles and stable reaction system

Active Publication Date: 2017-09-15
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Avoid the traditional high-temperature solid-phase method with high calcination temperature, large phosphor particle size, complicated follow-up process, high cost, and the particles obtained by chemical precipitation method are easy to agglomerate, irregular in shape, easy to introduce impurities and other defects

Method used

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  • Alkaline earth metal tungstate/ molybdate red fluorescent powder and preparation method thereof
  • Alkaline earth metal tungstate/ molybdate red fluorescent powder and preparation method thereof
  • Alkaline earth metal tungstate/ molybdate red fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the molecular formula CaY 1.95 (WO 4 ) 3.5 (MoO 4 ) 0.5 :0.04Eu 3+ ,0.01Bi 3+ Weigh out CaCO 3 (A.R.) 0.1mol, Y 2 o 3 (A.R.)0.0975mol, Na 2 WO 4 (A.R.) 0.35mol, Na 2 MoO 4 (A.R.)0.05mol, Eu 2 o 3 (99.99%) 0.002mol and Bi 2 o 3(A.R.) 0.0005mol; the weighed CaCO 3 , Y 2 o 3 、Eu 2 o 3 and Bi 2 o 3 Dissolve with 1:1.2 concentrated nitric acid and heat to remove excess nitric acid, then add appropriate amount of deionized water to prepare a colorless and transparent metal cation mixed solution A; weighed Na 2 WO 4 and Na 2 MoO 4 Dissolve in an appropriate amount of deionized water to prepare anion solution B; mix solution A and solution B under continuous rapid stirring to form a precursor solution, and adjust the pH value of the precursor solution to 7 with diluted ammonia water, and then add an appropriate amount of anhydrous Ethanol makes the water-alcohol ratio in the precursor solution 2:1; move the precursor solution into the reac...

Embodiment 2

[0025] According to the molecular formula SrLa 1.9 (WO 4 ) 3 (MoO 4 ):0.08Eu 3+ ,0.02Bi 3+ Weigh out SrCO 3 (A.R.) 0.1mol, La 2 o 3 (A.R.)0.095mol, Na 2 WO 4 (A.R.) 0.3mol, Na 2 MoO 4 (A.R.) 0.1mol, Eu 2 o 3 (99.99%) 0.004mol and Bi 2 o 3 (A.R.) 0.001mol; the weighed SrCO 3 , La 2 o 3 、Eu 2 o 3 and Bi 2 o 3 Dissolve with 1:1.2 concentrated nitric acid and heat to remove excess nitric acid, then add appropriate amount of deionized water to prepare a colorless and transparent metal cation mixed solution A; weighed Na 2 WO 4 and Na 2 MoO 4 Dissolve in an appropriate amount of deionized water to prepare anion solution B; mix solution A and solution B under continuous rapid stirring to form a precursor solution, and adjust the pH value of the precursor solution to 7 with diluted ammonia water, and then add an appropriate amount of anhydrous Ethanol makes the water-alcohol ratio in the precursor solution 1:1; move the precursor solution into the reactor and ...

Embodiment 3

[0027] According to the molecular formula BaY 1.85 (WO 4 ) 2.5 (MoO 4 ) 1.5 :0.12Eu 3+ ,0.03Bi 3+ Weigh out BaCO 3 (A.R.) 0.1mol, Y 2 o 3 (A.R.)0.0925mol, Na 2 WO 4 (A.R.) 0.25mol, Na 2 MoO 4 (A.R.)0.15mol, Eu 2 o 3 (99.99%) 0.006mol and Bi 2 o 3 (A.R.) 0.0015mol; the weighed BaCO 3 , Y 2 o 3 、Eu 2 o 3 and Bi 2 o 3 Dissolve with 1:1.2 concentrated nitric acid and heat to remove excess nitric acid, then add appropriate amount of deionized water to prepare a colorless and transparent metal cation mixed solution A; weighed Na 2 WO 4 and Na 2 MoO 4 Dissolve in an appropriate amount of deionized water to prepare anion solution B; mix solution A and solution B under continuous rapid stirring to form a precursor solution, and adjust the pH value of the precursor solution to 7 with diluted ammonia water, and then add an appropriate amount of anhydrous Ethanol makes the water-alcohol ratio in the precursor solution 1:2; move the precursor solution into the rea...

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Abstract

The invention relates to alkaline earth metal tungstate / molybdate red fluorescent powder and a preparation method thereof, and belongs to the technical field of luminescent materials. The fluorescent powder formula is MeLn2-a-b (WO4) 4-x (MoO4)x:aEu<3+>, bRE<3+>, wherein Me is at least one of alkaline earth metal Ca, Sr and Ba; Ln is at least one of rare earth elements Y, Gd, La and Lu; RE is at least one of doped elements Bi, Sm and Tb, 0<x<4, 0<a<0.5 and 0<b<0.1. The design idea is as follows: a solvothermal soft chemical method is used for synthesis of a sample, Eu<3+> is used as a luminescence center, alkaline earth metal rare earth tungstate / molybdate is used as a matrix, Bi<3+> is added as a sensitizer, and by interactions between ions and introduction of defects in the matrix structure, efficient red light emission can be achieved. The alkaline earth metal tungstate / molybdate red fluorescent powder can effectively absorb near ultraviolet light and emit red fluorescence.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to an alkaline earth metal tungstomolybdate red fluorescent powder and a preparation method thereof. Background technique [0002] In recent years, white light LEDs have fast response speed, high luminous efficiency, small size (small beads, easy to combine), long life (more than 10,000 hours), low heat generation (small heat radiation), energy saving and environmental protection (no pollution, recyclable ) and other advantages, known as the fourth-generation green lighting source, has been widely used in indoor and outdoor lighting, billboards, traffic lights, mobile phones, backlights for LCD displays, etc. Currently, the main way to obtain white LEDs is to combine blue / near-ultraviolet chips and yellow phosphors into white LEDs. However, this type of white LED has defects such as uneven luminous intensity, high color temperature (>5000K), strong glar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
CPCC09K11/7794
Inventor 蒲勇赵聪金容曹仕秀敬小龙
Owner CHONGQING UNIV OF ARTS & SCI
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