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Europium-doped strontium silicate red and orange fluorescent powder and preparation method thereof

A strontium silicate and fluorescent powder technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of reduced luminous efficiency, harsh reaction conditions, high sintering temperature, etc., and achieve low energy consumption, good crystallization performance, and high purity. Effect

Inactive Publication Date: 2017-08-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional Sr 2 SiO 4 : Eu 3+ Phosphor powder is obtained through a high-temperature solid-state method, which is simple to operate, but due to its high sintering temperature, the lattice position of the activator may be destroyed during the final grinding, resulting in a decrease in luminous efficiency, so the reaction conditions are relatively harsh.

Method used

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  • Europium-doped strontium silicate red and orange fluorescent powder and preparation method thereof
  • Europium-doped strontium silicate red and orange fluorescent powder and preparation method thereof
  • Europium-doped strontium silicate red and orange fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Weigh the raw material SrCO with a stoichiometric ratio of 2.2:1:0.005 3 , SiO 2 and Eu 2 o 3 , put it in an agate mortar, fully grind it at room temperature for 1 hour, add an appropriate amount of ethanol solution to further grind it, and grind it until the raw materials are dry and mixed uniformly;

[0027] 2) Put the mixture obtained above in a crucible, then place the crucible in a high-temperature resistance furnace, heat it up to 950°C at a rate of 2°C / min from room temperature, keep it warm for 2h, and take it out after cooling to room temperature;

[0028] 3) Pour the calcined powder obtained in step 2 into an agate mortar, crush and grind for 20 minutes;

[0029] 4) Pour the above powder into a crucible, then place the crucible in a high-temperature resistance furnace, start from room temperature, heat it up to 950 °C at a rate of 6 °C / min, keep it for 4 hours, and take it out after cooling to room temperature;

[0030] 5) Pour the block powder obtained...

Embodiment 2

[0035] 1) Weigh the raw material SrCO with a stoichiometric ratio of 2:1:0.010 3 , SiO 2 and Eu 2 o 3 , put it in an agate mortar, fully grind it at room temperature for 1 hour, add an appropriate amount of ethanol solution to further grind it, and grind it until the raw materials are dry and mixed uniformly;

[0036] 2) Put the mixture obtained above in a crucible, then place the crucible in a high-temperature resistance furnace, heat it up to 950°C at a rate of 2°C / min from room temperature, keep it warm for 3 hours, and take it out after cooling to room temperature;

[0037] 3) Pour the calcined powder obtained in step 2 into an agate mortar, crush and grind for 30 minutes;

[0038]4) Pour the above powder into a crucible, then place the crucible in a high-temperature resistance furnace, start from room temperature, heat it up to 1050 °C at a rate of 6 °C / min, keep it warm for 5 hours, and take it out after cooling to room temperature;

[0039] 5) Pour the block powder ...

Embodiment 3

[0045] 1) Weigh the raw material SrCO with a stoichiometric ratio of 2.1:1:0.03 3 , SiO 2 and Eu 2 o 3 , and put it in an agate mortar, fully grind it at room temperature for 1 hour, add an appropriate amount of ethanol solution to further grind it, and grind it until the raw materials are dry and mixed uniformly;

[0046] 2) Put the mixture obtained above in a crucible, then place the crucible in a high-temperature resistance furnace, heat it up to 1050°C at a rate of 1°C / min from room temperature, keep it warm for 3 hours, and take it out after cooling to room temperature;

[0047] 3) Pour the calcined powder obtained in step 2 into an agate mortar, crush and grind for 30 minutes;

[0048] 4) Pour the above powder into a crucible, then place the crucible in a high-temperature resistance furnace, start from room temperature, heat it up to 1000 °C at a rate of 7 °C / min, keep it warm for 4 hours, and take it out after cooling to room temperature;

[0049] 5) Pour the block ...

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Abstract

The invention discloses europium-doped strontium silicate red and orange fluorescent powder and a preparation method thereof. The method comprises the following steps of weighing SrCO3, SiO2 and Eu2O3 as raw materials at the molar ratio of (2-2.2):1:(0.005-0.070) separately, and fully grinding and mixing the weighed raw materials at a room temperature evenly; and putting the mixture obtained in the previous step into a crucible, putting the crucible into a high-temperature resistance furnace, raising the temperature to 950-1050 DEG C at the rate of 1-2 DEG C / min from a room temperature, carrying out heat preservation for 2-3h, cooling to the room temperature and taking out the product to obtain calcined powder. Through reducing the sintering temperature and carrying out calcination for multiple times, compared with a traditional solid-phase method, the reaction conditions are relatively mild, the energy consumption is greatly reduced, the prepared fluorescent powder is higher in purity, and excellent luminous performance of the fluorescent powder is obtained.

Description

technical field [0001] The invention relates to a fluorescent powder and a preparation method thereof, in particular to a europium-doped strontium silicate red-orange fluorescent powder and a preparation method thereof. Background technique [0002] White light LED is considered to be the most promising fourth-generation green lighting source because of its low energy consumption, long life, short response time, good color stability and no pollution. It has broad application prospects and market, is considered an essential solid-state lighting source. Currently, most commercially available LED-based white light sources rely on phosphors (YAG:Ce 3+ ) conversion emission method is to use blue GaN chips to excite yellow phosphor to obtain white light. We know that this commercial method is very mature, and the cost is low and the operation is simple, but it is undeniable that the total energy of the red light spectrum in YAG is much farther than It is far lower than the ratio...

Claims

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Application Information

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IPC IPC(8): C09K11/59
CPCC09K11/7734
Inventor 史永胜石景俊董晨权博
Owner SHAANXI UNIV OF SCI & TECH
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