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Tetravalent manganese ion doped strontium magnesium aluminate red phosphor, and preparation method thereof

A red phosphor, ion doping technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of weak light emission, high color temperature, low CRI, etc.

Active Publication Date: 2012-01-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this kind of WLED is that it emits weak light in the red spectrum region, which directly leads to the high color temperature of commercial WLEDs (usually at 4500-6500K) and low CRI (usually less than 80)
Sr 2 MgAl 22 o 36 :Mn 4+ Red phosphor has not been reported yet

Method used

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  • Tetravalent manganese ion doped strontium magnesium aluminate red phosphor, and preparation method thereof
  • Tetravalent manganese ion doped strontium magnesium aluminate red phosphor, and preparation method thereof
  • Tetravalent manganese ion doped strontium magnesium aluminate red phosphor, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Select strontium carbonate, magnesium oxide, aluminum oxide, and manganese carbonate as the starting compound raw materials, and weigh four compound raw materials according to the molar ratio of each element, and there are ten groups in total: (1) Sr: 0.92; Mg: 0.91; Al: 20 ; Mn: 0.0005; (2) Sr: 0.92; Mg: 0.91; Al: 20; Mn: 0.001; (3) Sr: 0.92; Mg: 0.91; Al: 20; Mn: 0.003; (4) Sr: 0.92; Mg: 0.91; Al: 20; Mn: 0.006; (5) Sr: 0.92; Mg: 0.91; Al: 20; Mn: 0.009; (6) Sr: 0.92; Mg: 0.91; Al: 20; (7) Sr: 0.92; Mg: 0.91; Al: 20; Mn: 0.015; (8) Sr: 0.92; Mg: 0.91; Al: 20; : 20; Mn: 0.021; (10) Sr: 0.92; Mg: 0.91; Al: 20; Mn: 0.024; the total weight of the control mixture is 50 grams. After grinding and mixing 50 grams of the mixture, put it into a corundum crucible, and then put the crucible into a high-temperature electric furnace. Precisely control the heating rate, the sample is at 800 o C pre-fired for 5 hours. The pre-fired sample was taken out, ground and mixed again, put...

Embodiment 2

[0033] Select strontium bicarbonate, magnesium hydroxide, aluminum nitrate, and manganous oxide as starting materials, and weigh four kinds of compound raw materials according to the molar ratio of each element, and there are ten groups in total: (1) Sr: 2; Mg: 1; Al : 22; Mn: 0.0005; (2) Sr: 2; Mg: 1; Al: 22; Mn 0.001; (3) Sr: 2; Mg: 1; Al: 22; Mn: 0.003; (4) Sr: 2 ; Mg: 1; Al: 22; Mn: 0.006; (5) Sr: 2; Mg: 1; Al: 22; Mn: 0.009; (6) Sr: 2; Mg: 1; Al: 22; Mn: 0.012 (7) Sr: 2; Mg: 1; Al: 22; Mn: 0.015; (8) Sr: 2; Mg: 1; Al: 22; Mn: 0.018; (9) Sr: 2; Mg: 1; Al: 22; Mn: 0.021; (10) Sr: 2; Mg: 1; 22; Mn: 0.024; the total weight of the control mixture is 50 grams. After grinding and mixing 50 grams of the mixture, put it into a corundum crucible, and then put the crucible into a high-temperature electric furnace. Precisely control the heating rate, the sample is at 700 o C pre-fired for 5 hours. The pre-fired sample was taken out, ground and mixed again, put into a crucible, an...

Embodiment 3

[0035] Choose strontium oxide, magnesium carbonate, aluminum hydroxide, manganese oxide as starting raw material, according to the molar proportion of each element Sr: 1.86; Mg: 0.66; Al: 22.3; Mn: 0.012; Take four kinds of raw materials respectively, control the mixture total Weighs 50 grams. After grinding and mixing 50 grams of the mixture, put it into a corundum crucible, and then put the crucible into a high-temperature electric furnace. Precisely control the heating rate, the sample is at 1000 o C pre-fired for 5 hours. The pre-fired sample was taken out, ground and mixed again, put into a crucible, and heated at 1600°C under air. o C, firing twice for 3 hours, grinding again in the middle, and controlling the cooling rate after firing, to obtain tetravalent manganese ion-doped strontium magnesium aluminate red fluorescent material. X-ray diffraction analysis shows that it contains Sr 2 MgAl 22 o 36 crystal phase. The spectral properties of the phosphor are simila...

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Abstract

The present invention provides tetravalent manganese ion doped strontium magnesium aluminate red phosphor, and a preparation method thereof. The phosphor is an intermediate transition of crystal structures of magnetoplumbite and beta-alumina mineral, belongs to the hexagonal crystal phase, and has molecular formula of Sr2MgAl22O36. The preparation method for the phosphor comprises: weighing raw materials according to a certain element molar ratio, wherein the raw materials comprise a strontium compound, a magnesium compound, an aluminium compound and a manganese compound, the element molar ratio of the Sr to the Mg to the Al to the Mn is 0.92-2:0.66-1:10-25:0.0005-0.024; after grinding and mixing, carrying out preburning for 5-10 hours, wherein the temperature is controlled to 700-1000 DEG C; removing the preburned sample, grinding and mixing again, then carrying out high temperature firing for 6-12 hours, wherein the temperature is controlled to 1200-1600 DEG C. The prepared red phosphor provided by the present invention is applicable for the fields of fluorescent lamps, solid-state white LED, display and the like.

Description

technical field [0001] The invention belongs to the field of luminescent material research, in particular to a red fluorescent powder doped with strontium magnesium aluminate by tetravalent manganese ions and a preparation method thereof. Background technique [0002] Since the beginning of summer, there have been various degrees of power shortages across the country, and Guangzhou is no exception. Taking June 2, 2011 as an example, the power supply load of the Guangzhou power grid was 10.446 million kilowatts, a year-on-year increase of 6.4%, and the peak power consumption was two years earlier than in 2010. months. Under the situation of sustained economic growth, it is estimated that in 2011, the new load of Guangzhou power grid will be 1 million kilowatts. In order to cope with the electricity shortage, enterprises and institutions have to cut off the electricity, which brings great inconvenience to people's work and life. In order to solve and alleviate this problem, ...

Claims

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Application Information

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IPC IPC(8): C09K11/64
Inventor 彭明营曹人平邱建荣
Owner SOUTH CHINA UNIV OF TECH
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