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A kind of white light fluorescent powder for LED and preparation method thereof

A fluorescent powder and white light technology, applied in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve the problems of high cost, doping more rare earth ions, etc.

Active Publication Date: 2017-10-31
HEBEI LIFU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a white light phosphor for LED and its preparation method, provide more material choices for white light LED, and solve the problem that the preparation of existing white light phosphor needs to be doped with more rare earth ions, resulting in higher cost

Method used

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  • A kind of white light fluorescent powder for LED and preparation method thereof
  • A kind of white light fluorescent powder for LED and preparation method thereof
  • A kind of white light fluorescent powder for LED and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Weigh calcium carbonate (CaCO 3 ) 0.9759g, strontium carbonate (SrCO 3 ) 0.3838g, magnesium oxide (MgO) 0.5501g, silicon dioxide (SiO 2 ) 1.5621g, placed in an agate mortar and ground for 30 minutes and mixed evenly; the ground powder was placed in a small dry pot and buried in a carbon powder reducing atmosphere for roasting, and the heating rate was 8°C / min to 1300°C, sintered at this temperature for 6 hours, and cooled naturally to room temperature; the sample was taken out and ground, and the chemical formula was Ca 0.75 Sr 0.2 Mg 1.05 (Si 2 o 6 ) of the silicate matrix.

Embodiment 2

[0029] Weigh calcium carbonate (CaCO 3 ) 0.9368g, strontium carbonate (SrCO 3 ) 0.3838g, magnesium oxide (MgO) 0.5344g, silicon dioxide (SiO 2 ) 1.5621g, manganese carbonate (MnCO 3) 0.0299g, europium trioxide (Eu 2 o 3 ) 0.0686g, put it in an agate mortar and grind it for 30 minutes and mix it evenly; put the ground powder in a small dry pot and bury it in a carbon powder reducing atmosphere for roasting, and heat up to 1300°C, sintered at this temperature for 6 hours, and cooled naturally to room temperature; the sample was taken out and ground, and the chemical formula was Ca 0.72 Eu 0.03 Sr 0.2 Mg 1.03 mn 0.02 (Si 2 o 6 ) white light phosphor.

Embodiment 3

[0031] Weigh calcium carbonate (CaCO 3 ) 0.9499g, strontium carbonate (SrCO 3 ) 0.3838g, magnesium oxide (MgO) 0.5344g, silicon dioxide (SiO 2 ) 1.5621g, manganese carbonate (MnCO 3 ) 0.0448g, europium trioxide (Eu 2 o 3 ) 0.0457g, put it in an agate mortar and grind it for 20 minutes and mix it evenly; put the ground powder in a small dry pot and bury it in a carbon powder reducing atmosphere for roasting, and heat up at a heating rate of 10°C / min to 1300°C, sintered at this temperature for 6 hours, and cooled naturally to room temperature; the sample was taken out and ground, and the chemical formula was Ca 0.73 Eu 0.02 Sr 0.2 Mg 1.02 mn 0.03 (Si 2 o 6 ) white light phosphor.

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Abstract

The invention discloses white-light fluorescent powder for an LED.The general chemical formula of the fluorescent powder is Ca[0.75-x]EuxSr0.2Mg[1.05-y]Mny(Si2O6), wherein x is larger than or equal to 0.02 and smaller than or equal to 0.04, and y is larger than or equal to 0.01 and smaller than or equal to 0.03.A preparation method of the fluorescent powder comprises the steps that 1, oxides or carbonates containing Ca, Sr, Mg, Si, Eu and Mn are weighed according to the mole ratio of all the elements in the general chemical formula, mixed and ground, and a mixture is obtained; 2, the mixture is put in a reducing atmosphere to be subjected to high-temperature roasting, and a sintered body is obtained; 3, the sintered body is cooled to room temperature and then ground, and the white-light fluorescent powder for the LED is obtained.The obtained white-light fluorescent powder is wide in excitation wavelength range, high in luminous intensity, high in stability and capable of being effectively excited by specific ultraviolet wavelength to emit bright white light.A matrix adopted in the preparation method is non-rare-earth ion-doped single pure silicate, the production cost is greatly reduced compared with the prior art, the preparation technology is simple, the method is easy to operate and control, the safety is high, the preparation time is short, the production efficiency is high, and the method is suitable for industrial large-scale production, application and popularization.

Description

technical field [0001] The invention relates to a luminescent material and a preparation method thereof, in particular to a white light fluorescent powder for LED and a preparation method thereof. Background technique [0002] In the field of lighting, white LEDs are considered to be the fourth generation of lighting sources to replace traditional incandescent lamps, fluorescent lamps and high-intensity gas discharge lamps. Light-Emitting Diode (LED) white light LED devices have the advantages of high efficiency, energy saving, environmental protection, small size, long life, high reliability, etc., and are widely used in various lighting and display fields. [0003] At present, there are two main ways to realize white light LED: (1) Blue light LED chip excites yellow phosphor powder, and blue light and yellow light are mixed to form white light; (2) Purple light (or ultraviolet) LED chip excites red, green and blue three kinds of fluorescence Pink, red, green, blue light m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/59
CPCC09K11/7734Y02B20/00
Inventor 李盼来孙远生王志军杨志平
Owner HEBEI LIFU CHEM TECH
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