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Preparation method and applications of dysprosium-doped blue phosphor

A blue fluorescent powder, soluble technology, applied in the field of preparation of dysprosium-doped blue fluorescent powder, can solve the problems of luminous effect and luminous intensity reduction, preparation difficulties, etc., to achieve good particle consistency, simple process, and high sample purity Effect

Inactive Publication Date: 2015-08-12
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparation method and applications of dysprosium-doped blue phosphor
  • Preparation method and applications of dysprosium-doped blue phosphor
  • Preparation method and applications of dysprosium-doped blue phosphor

Examples

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 present invention discloses a preparation method and applications of dysprosium-doped blue phosphor. The method comprises: weighing soluble salts of lanthanum and dysprosium according to the stoichiometric ratio of a chemical general formula (1-x)La2O3-TiO2-xDy2O3 (wherein x is 0.01-0.09), dissolving into an appropriate amount of deionized water, uniformly mixing to prepare a solution A, taking an appropriate amount of an alcohol solvent, adding an appropriate amount of tetrabutyl titanate in a dropwise manner to obtain a solution B, uniformly mixing the solution A and the solution B, adding an appropriate amount of a soluble acid, stirring, heating, carrying out thermal insulation to obtain a precursor gel C, placing the precursor gel C into a corundum crucible, calcining in a muffle furnace, and carrying out filtering and washing to obtain the blue phosphor. According to the present invention, the novel pyrochlore structure lanthanum titanate substrate is used and the single rare earth metal dysprosium is used to dope, such that the luminous efficiency is high, the obtained blue phosphor has characteristics of high purity and good color purity, and the method has characteristics of simple process and low preparing cost.

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 Applications(China)
IPC IPC(8): C09K11/78H01L51/54
CPCY02B20/00
Inventor 刘宣文齐建全王琦董晓宇和朝阳白永一郭瑞
Owner NORTHEASTERN UNIV
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