Red phosphor and preparation method thereof

A red phosphor and compound technology, applied in the field of red phosphor and its preparation, can solve the problems of high production cost, low color rendering index, and great environmental hazards of matrix materials

Active Publication Date: 2012-10-17
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 the low color rendering index (abbreviated as CRI below), usually less than 80
The commercialized one is 3.5MgO.0.5MgF 2 .GeO 2 :Mn 4+ , the emission peak is located near 660nm, using expensive germanium oxide as a raw material, making its production cost high
From the perspective of environmental protection, although arsenide and fluoride emit light, the matrix materials are more harmful to the environment.

Method used

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  • Red phosphor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Select strontium carbonate, aluminum oxide, manganese carbonate and boric acid as the starting compound raw materials, and weigh four kinds of compound raw materials respectively according to the molar ratio of each element, totally 8 groups, and the ratio is as follows:

[0035] (1) Sr:Al:Mn:B=4:13.986:0.014:0.07, corresponding to x=0.1%, y=0.5%;

[0036] (2) Sr:Al:Mn:B=4:13.986:0.014:0.70, corresponding to x=0.1%, y=5%;

[0037] (3) Sr:Al:Mn:B=4:13.986:0.014:1.40, corresponding to x=0.1%, y=10%;

[0038](4) Sr:Al:Mn:B=4:13.986:0.014:2.10, corresponding to x=0.1%, y=15%;

[0039] (5) Sr:Al:Mn:B=4:13.986:0.014:2.80, corresponding to x=0.1%, y=20%;

[0040] (6) Sr:Al:Mn:B=4:13.986:0.014:3.50, corresponding to x=0.1%, y=25%;

[0041] (7) Sr:Al:Mn:B=4:13.986:0.014:4.20, corresponding to x=0.1%, y=30%;

[0042] (8) Sr:Al:Mn:B=4:13.986:0.014:5.60, corresponding to x=0.1%, y=40%;

[0043] The total weight of the control mixture is 20 grams. After grinding and mixing 20 ...

Embodiment 2

[0050] Select strontium bicarbonate, aluminum nitrate, manganous oxide and diboron trioxide as starting materials, and weigh four kinds of compound raw materials respectively according to the molar ratio of each element, altogether 3 groups, and the ratio is as follows:

[0051] (1) Sr:Al:Mn:B=4:13.9986:0.0014:0.70, corresponding to x=0.01%, y=5.0%;

[0052] (2) Sr:Al:Mn:B=4:13.9860:0.014:0.70, corresponding to x=0.10%, y=5.0%;

[0053] (3) Sr:Al:Mn:B=4:13.3000:0.70:0.70, corresponding to x=5.0%, y=5.0%;

[0054] The total weight of the control mixture is 20 grams. After grinding and mixing 20 grams of the mixture, put it into a corundum crucible, and then put the crucible into a high-temperature electric furnace. Precisely controlling the heating rate, the sample was pre-fired at 500°C for 10 hours. Take out the pre-fired sample, grind and mix it again, put it into the crucible, and burn it at 1300°C for 5 hours under the air atmosphere, after grinding it again, burn it at...

Embodiment 3

[0057] Select strontium oxide, aluminum hydroxide, manganese oxide and boric acid as starting materials, according to the molar ratio of each element Sr:Al:Mn:B=4:13.9860:0.014:0.70, corresponding to x=0.10%, y=5.0%; Four kinds of raw materials were weighed respectively, and the total weight of the control mixture was 20 grams. After grinding and mixing 20 grams of the mixture, put it into a corundum crucible, and then put the crucible into a high-temperature electric furnace. Precisely controlling the heating rate, the sample was pre-fired at 1000°C for 5 hours. The pre-fired sample is taken out, ground and mixed again, burned at 1600°C for 2 hours in an air atmosphere, taken out and ground again, burned at 1600°C for 2 hours in an air atmosphere, and cooled naturally with the furnace, that is The tetravalent manganese ion-doped strontium aluminate red fluorescent material is prepared. X-ray diffraction analysis showed that it was Sr 4 al 14 o 25 :Mn 4+ crystal phase. ...

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Abstract

The present invention discloses a red phosphor, wherein an expression general formula is Sr4Al14O25:Mn<4+>, a crystal structure of the red phosphor belongs to a orthorhombic crystal system, and the activation ion is Mn<4+>. The present invention further discloses a preparation method for the red phosphor. The method comprises: weighing raw materials according to an element mole ratio of Sr to Al to Mn to B of 4:14(1-x):14x:14y, wherein x is more than or equal to 0.01% and less than or equal to 5%, and y is more than or equal to 0.5% and less than or equal to 40%; grinding and uniformly mixing, and then carrying out pre-burning for 5-10 hours at a temperature of 500-1000 DEG C under an oxidizing atmosphere; taking out the material, grinding and uniformly mixing, and then carrying out burning for 2-12 hours at a temperature of 1050-1600 DEG C under an oxidizing atmosphere; and taking out the material, grinding and uniformly mixing, and then carrying out burning for 2-12 hours at a temperature of 1050-1600 DEG C under an oxidizing atmosphere. The red phosphor of the present invention has characteristics of broad ultraviolet and blue light absorption, long fluorescence lifetime, low cost, and environment protection, wherein the red phosphor has red fluorescence covering the range of 600-750 nm under ultraviolet or blue light excitation.

Description

technical field [0001] The invention relates to luminescent materials, in particular to a red fluorescent powder and a preparation method thereof. Background technique [0002] At present, commercial white light LEDs (hereinafter referred to as WLEDs) use blue light InGaN LEDs to excite Y 3 Al 5 o 12 : Ce 3+ Yellow phosphor, yellow light mixed with transmitted blue light to produce white light. The disadvantage of this kind of WLED is that it emits weakly in the red spectral region, which directly leads to the high color temperature of commercial WLEDs (usually at 4500-6500K), and the low color rendering index (abbreviated as CRI below), usually less than 80. To solve this problem, a red phosphor (which can be excited by blue light) can be introduced into commercial WLEDs, or try to use an LED chip emitting 350-410nm ultraviolet light to excite red, blue and green three primary color mixed phosphors to make another phosphor. kinds of WLEDs. The CRI of WLED based on UV ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64
Inventor 彭明营梁楚麒郑嘉裕邱建荣
Owner SOUTH CHINA UNIV OF TECH
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