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A kind of preparation method and application of dysprosium doped blue phosphor powder

A blue phosphor, soluble technology, applied in the field of preparation of dysprosium-doped blue phosphor, can solve the problems of difficult preparation, luminous effect and luminous intensity reduction, and achieves simple process, good particle consistency and high purity. Effect

Inactive Publication Date: 2017-07-07
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the selection of activators, Eu is mostly selected at this stage 2+ As an activator of blue light, in many systems Eu 2+ It is relatively difficult to prepare, especially in the structure based on lanthanum titanate, Eu 2+ Replace La 3+ Easier to generate as Eu 3+ , so that the luminous effect and luminous intensity are reduced

Method used

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  • A kind of preparation method and application of dysprosium doped blue phosphor powder
  • A kind of preparation method and application of dysprosium doped blue phosphor powder
  • A kind of preparation method and application of dysprosium doped blue phosphor powder

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Experimental program
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Effect test

Embodiment 1

[0033] According to the general chemical formula: (1-x) La 2 o 3 -TiO 2 -xDy 2 o 3 (where x=(0.01-0.09) stoichiometric ratio weighs 2 (1-x) mmol lanthanum acetate (La(CH 3 COO) 3 , A.R.) was dissolved in an appropriate amount of distilled water, and 1 mmol of tetrabutyl titanate (C 16 h 36 o 4 Ti, A.R.), dissolved in 30ml of ethanol. According to the stoichiometric ratio, x=(1%, 3%, 5%, 7%, 9%) doped dysprosium acetate (Dy(CH 3 COO) 3 , A.R.), dropwise added 10mmol acetic acid (CH 3 COOH, A.R.), stirred for 1 h, and put into a water bath at 80°C for about 5 h to obtain a colloidal precipitate, the precursor sol C. The precursor sol C was taken out and placed in a corundum crucible, calcined in a muffle furnace at 1100° C. for 3 hours, and kept for 2 hours to obtain the required lanthanum titanate blue phosphor.

Embodiment 2

[0035] According to the general chemical formula: (1-x) La 2 o 3 -TiO 2 -xDy 2 o 3 (wherein x=(0.01-0.09)) stoichiometric ratio weighs 4 (1-x) mmol lanthanum nitrate (La(NO 3 )3 , A.R.) was dissolved in an appropriate amount of distilled water, and 2 mmol of tetrabutyl titanate (C 16 h 36 o 4 Ti, A.R.), dissolved in 50 ml methanol. According to the stoichiometric ratio, x=(1%, 3%, 5%, 7%, 9%) doped dysprosium nitrate (Dy(NO 3 ) 3 , A.R.), dropwise added 20mmol nitric acid (HNO 3 , A.R.), stirred for 1 h, put into a water bath at 100°C for about 4 h, and obtained a colloidal precipitate, the precursor sol C. The precursor sol C was taken out and placed in a corundum crucible, calcined in a muffle furnace at 1200° C. for 3 hours, and kept for 2 hours to obtain the required lanthanum titanate blue phosphor.

[0036] Pure La was analyzed using a DX2500 X-ray diffractometer 2 TiO 5 and different Dy 3+ Doped ratio samples were tested with a scan rate of 0.04° / min and a...

Embodiment 3

[0038] Weigh 1.98mmol lanthanum nitrate (La(NO 3 ) 3 , A.R.) was dissolved in an appropriate amount of distilled water, and 1 mmol of tetrabutyl titanate (C 16 h 36 o 4 Ti, A.R.), dissolved in 50 ml methanol. Weigh 0.02mmol dysprosium acetate (Dy(CH 3 COO) 3 , A.R.), dropwise added 10mmol nitric acid (HNO 3 , A.R.), stirred for 1.5h, and put into a water bath at 60°C for about 6h to obtain a colloidal precipitate, the precursor sol C. The precursor sol C was taken out and placed in a corundum crucible, calcined in a muffle furnace at 1100° C. for 4 hours, and kept for 1 hour to obtain the desired phosphor. image 3 In order to monitor the excitation spectrum at a wavelength of 577nm.

[0039] Such as Figure 4 As shown, a very strong charge transfer transition band (CT) appears in the range of 250-300nm, indicating that Dy 3+ Strong interaction with coordinated oxygen atoms. In addition, there are two very weak f-f electronic transition excitation peaks in the range...

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Abstract

The invention discloses a preparation method and application of dysprosium-doped blue phosphor, which includes the following steps: according to the general chemical formula (1-x)La2O3-TiO2-xDy2O3 (where x=(0.01-0.09)) Stoichiometric ratio: Weigh the soluble salt of lanthanum and the soluble salt of dysprosium, dissolve them in an appropriate amount of deionized water, mix them evenly, and prepare solution A; take an appropriate amount of alcohol solvent, and drop an appropriate amount of tetrabutyl titanate to obtain solution B. After mixing solution A and solution B evenly, add an appropriate amount of soluble acid, stir, heat, and keep warm to obtain precursor gel C; place precursor gel C in a corundum crucible, calcine in a muffle furnace, and filter , after washing, blue phosphor powder is obtained. The invention uses a new type of pyrochlore structure lanthanum titanate matrix and uses a single rare earth metal dysprosium for doping, which has high luminous efficiency. The resulting blue phosphor powder has high purity and good color purity, and the process is simple and the preparation cost is low.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a preparation method and application of dysprosium-doped blue fluorescent powder. Background technique [0002] As a new type of all-solid-state lighting source, white LED is regarded as a green lighting source in the 21st century because of its many advantages, broad application prospects and potential markets. Rare earth elements are a huge treasure trove of luminescent materials. Among the various luminescent materials developed by humans, rare earth elements play a very important role. Rare earth elements are used as activators, sensitizers, and co-activators. Compared with the corresponding non-rare earth fluorescent materials, their luminous efficiency and light color are better. Therefore, rare earth ions have been widely used in the fields of displays, fluorescent lamps and the like due to doped phosphors. [0003] White light is formed by mixing polychrom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78H01L51/54
CPCY02B20/00
Inventor 刘宣文郭瑞王琦王燕燕张晓雷和朝阳刘广张杨
Owner NORTHEASTERN UNIV LIAONING
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