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Method for producing ultraviolet light excitated single phase white radiation fluorescent powder

A fluorescent powder and ultraviolet light technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of high reaction energy consumption, easy generation of heterogeneous phases, uneven mixing of raw materials, etc., to achieve good luminescence performance, easy to obtain raw materials, Operational Security Effects

Inactive Publication Date: 2008-05-07
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
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Problems solved by technology

This method has obvious disadvantages: uneven mixing of raw materials, easy to produce impurity phases, and uneven distribution of activator concentration, which affects the luminous efficiency of this phosphor; high energy consumption for the reaction; repeated ball milling is required to obtain proper The particle size, defects and impurities produced by the ball milling process seriously damage the luminous intensity of the luminescent powder

Method used

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  • Method for producing ultraviolet light excitated single phase white radiation fluorescent powder
  • Method for producing ultraviolet light excitated single phase white radiation fluorescent powder
  • Method for producing ultraviolet light excitated single phase white radiation fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1Sr 0.995 Eu 0.005 Zn 1.995 mn 0.005 (PO 4 ) 2

[0030] Weigh SrCO 3 (analytical pure) 2.938g, ZnO (analytical pure) 3.247g, MnCO 3 (99.99%) 0.0115g and Eu 2 o 3 (99.99%) 0.0176 g. The above raw materials were dissolved in excess concentrated nitric acid. After fully mixing the solution, add 0.55 g of salicylic acid complexing agent. After stirring evenly, add urea 0.24g, PEG0.3g, NH 4 h 2 PO 4 (Analytical pure) 4.601g, and fully stirred evenly. The solution was heated at 60°C until all the water in the solution was evaporated to form a gel. In the process of heating the solution, add ammonia water to the solution to control the pH of the solution to be about 4. The obtained gel was burned in an air atmosphere at 900° C. for 5 hours to obtain a precursor powder. The obtained precursor powder was sintered in a reducing atmosphere at 1000° C. for 2 hours to obtain the desired phosphor.

[0031] figure 1 It is the excitation spectrum of the fluor...

Embodiment 2

[0032] Example 2Sr 0.99 Eu 0.01 Zn 1.99 mn 0.01 (PO 4 ) 2

[0033] Weigh SrCO 3 (analytical pure) 2.923g, ZnO (analytical pure) 3.239g, MnCO 3 (99.99%) 0.023g and Eu 2 o 3 (99.99%) 0.0352 g. The above raw materials were dissolved in excess concentrated nitric acid. After fully mixing the solution, add 0.7 g of salicylic acid complexing agent. After stirring evenly, add urea 0.6g, PEG0.3g, NH 4 h 2 PO 4(Analytical pure) 4.601g, and fully stirred evenly. The solution was heated at 70°C until all the water in the solution was evaporated to form a gel. In the process of heating the solution, add ammonia water to the solution to control the pH value of the solution to be about 7. The obtained gel was burned in an air atmosphere at 900° C. for 2 hours to obtain a precursor powder. The obtained precursor powder was sintered in a reducing atmosphere at 1000° C. for 15 hours to obtain the desired phosphor.

[0034] figure 2 It is the excitation spectrum of the fluor...

Embodiment 3

[0035] Example 3Sr 0.99 Eu 0.01 Zn 1.99 mn 0.01 (PO 4 ) 2

[0036] Weigh SrCO 3 (analytical pure) 2.923g, ZnO (analytical pure) 3.223g, MnCO 3 (99.99%) 0.046g and Eu 2 o 3 (99.99%) 0.0352 g. The above raw materials were dissolved in excess concentrated nitric acid. After fully mixing the solution, add 2 g of salicylic acid complexing agent. After stirring evenly, add urea 1g, PEG 1g, NH 4 h 2 PO 4 (Analytical pure) 4.601g, and fully stirred evenly. The solution was heated at 90°C until all the water in the solution was evaporated to form a gel. In the process of heating the solution, add ammonia water to the solution to control the pH value of the solution to be about 5. The obtained gel was burned in an air atmosphere at 900° C. for 3 hours to obtain a precursor powder. The obtained precursor powder was sintered in a reducing atmosphere at 1000° C. for 25 hours to obtain the desired phosphor.

[0037] Figure 4 It is the excitation spectrum of the fluoresce...

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Abstract

The invention discloses a preparation method of ultraviolet excitation single white phosphor, belonging to the technical field of luminescent materials. The structural formula of the phosphor is Sr1-XEuXZn2-YMnY(PO4)2, 0.005 is less than or equal to x is less than or equal to 0.1, 0.005 is less than or equal to y is less than or equal to 0.1. According to the molar ratio of Sr, Eu, Zn, and Mn in the structural formula Sr1-XEuXZn2-YMnY(PO4)2, the materials of SrCO3, ZnO, MnCO3, and Eu2O3 are weighted and dissolved in excess concentrated nitric acid. The solution is well mixed, and salicylic acid complexing agent is added in; after even stirring, urea, PEG and NH4H2PO4 are added to the solution, which is then stirred evenly. The solution is heated until all the water in the solution is evaporated to dryness, and then a gel is formed. Ammonia is added to the solution during the heating process of the solution. The acquired gel is combusted, and precursor powder is obtained. The obtained precursor powder is sintered, and the needed phosphor is produced. The invention has the advantages of easy access to the materials needed by the preparation, safe operation, and low energy consumption.

Description

technical field [0001] The invention relates to a preparation method in the technical field of luminescent materials, in particular to a preparation method for a single-phase white light phosphor excited by ultraviolet light. Background technique [0002] The ultraviolet light excitation single-phase white light fluorescent powder involved in the present invention is mainly used in white light semiconductor light-emitting diodes (LEDs). White light semiconductor light-emitting diodes (LEDs) are regarded as the fourth generation of lighting sources after incandescent lamps, fluorescent lamps and high-pressure gas discharge lamps because of their energy saving, environmental protection, long life, small size, fast response, and impact resistance. In 1996, Japan's Nichia Chemical Company Nakamura.S and others will emit yellow light Y 3 al 5 o 12 : Ce 3+ (YAG:Ce 3+ ) as a phosphor, coated on the blue-emitting GaN diode to prepare a white LED. However, its white light is co...

Claims

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Application Information

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IPC IPC(8): C09K11/81
Inventor 孙康李万万刘霁
Owner SHANGHAI JIAO TONG UNIV
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