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Tetravalent manganese ion doped lithium aluminium oxyfluoride red phosphor and preparation method thereof

A technology of red fluorescent powder and ion doping, which is applied in the field of red fluorescent materials, can solve the problems that restrict the popularization and application of LED lighting, high color temperature of commercial white LEDs, and unsatisfactory applicability, and achieve simple and easy preparation methods and excellent performance. Excellent, good thermal stability

Active Publication Date: 2017-09-15
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, commercial white LEDs use blue LED chips (InGaN) and yellow phosphors (YAG:Ce) that can be effectively excited by blue light. 3+ ) in combination, the disadvantage of this method is that it emits weak light in the red spectral region, which directly leads to a high color temperature of commercial white LEDs (usually at 4500-6500K) and a low color rendering index (Ra~70), Greatly restricts the popularization and application of LED lighting
Mn that has been reported so far 4+ The practical application of ion-doped red phosphors in white LEDs is not very ideal, so in order to obtain red phosphors with low cost and high luminous efficiency, research on new Mn 4+ Ion-doped red fluorescent materials have special significance

Method used

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  • Tetravalent manganese ion doped lithium aluminium oxyfluoride red phosphor and preparation method thereof
  • Tetravalent manganese ion doped lithium aluminium oxyfluoride red phosphor and preparation method thereof
  • Tetravalent manganese ion doped lithium aluminium oxyfluoride red phosphor and preparation method thereof

Examples

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example 1

[0025] Example 1: Select lithium-containing compound raw materials, aluminum-containing compound raw materials, fluorine-containing compound raw materials and manganese-containing compound raw materials as starting materials, by element molar ratio Li:Al:F:Mn=1:(4-x ): 1:x, accurately weigh the raw materials respectively, where x is respectively 0.002, 0.004, 0.008, 0.016, 0.024, 0.032, 0.04; respectively weigh lithium fluoride, aluminum oxide, manganese carbonate three kinds of raw materials, control the total weight of the mixture In 20 grams; 20 grams of the mixture is mixed by ball milling, put it into a corundum crucible, and then put the crucible into a high-temperature electric furnace; accurately control the heating rate, control the decomposition reaction speed of the compound raw materials, and prevent the mixture from overflowing from the crucible. ℃ calcination for 7 hours, then cooled to room temperature (25 ℃) with the furnace, the chemical composition can be obta...

example 2

[0026] Example 2: Lithium fluoride, aluminum carbonate, and manganese carbonate are selected as starting materials, and the three raw materials are accurately weighed according to the element molar ratio R:Al:F:Mn=1:(4-x):1:x , where x takes 0.002, 0.004, 0.008, 0.016, 0.024, 0.032, 0.04 respectively. Control the total weight of the mixture at about 20 grams. After 20 grams of the mixture was mixed by ball milling, it was put into a corundum crucible, and then the crucible was put into a high-temperature electric furnace. Precisely control the heating rate, control the decomposition reaction rate of the compound raw materials, and prevent the mixture from overflowing from the crucible. The mixture is calcined at 750°C for 7 hours, and then cooled to room temperature (25°C) with the furnace, and the chemical composition is LiAl. 4-x o 6 F:xMn 4+ The novel Mn 4+ Ion-doped alumina fluoride lithium red fluorescent material. X-ray diffraction analysis shows that the prepared r...

example 3

[0027] Example 3: Lithium fluoride, aluminum oxide, and manganese acetate are selected as starting materials, and the three raw materials are accurately weighed according to the element molar ratio Li:Al:F:Mn=1:(4-x):1:x , where 0.002≤x≤0.04. Control the total weight of the mixture at about 20 grams. After 20 grams of the mixture was mixed by ball milling, it was put into a corundum crucible, and then the crucible was put into a high-temperature electric furnace. Precisely control the heating rate, control the decomposition reaction rate of the compound raw materials, and prevent the mixture from overflowing from the crucible. The mixture is calcined at 750°C for 7 hours, and then cooled to room temperature (25°C) with the furnace, and the chemical composition is LiAl. 4-x o 6 F:xMn 4+ The novel Mn 4+ Ion-doped alumina fluoride lithium red fluorescent material. X-ray diffraction analysis shows that the prepared red fluorescent material is a pure phase of lithium aluminum ...

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Abstract

The invention discloses tetravalent manganese ion doped lithium aluminium oxyfluoride red phosphor and a preparation method thereof. The phosphor can emit red light with the wavelength being 662 nm after being excited by excitation light sources such as ultraviolet light or blue light and the like and has the chemical formula LiAl(4-x)O6F: xMn4<+>, wherein x is larger than or equal to 0.002 and smaller than or equal to 0.04. The preparation method comprises steps as follows: lithium fluoride, aluminum oxide and manganese carbonate are mixed, ground, put into a muffle furnace to be calcined and then ground, and the lithium aluminium oxyfluoride red phosphor is obtained. The red phosphor has the remarkable advantages as follows: raw materials are widely sourced and easy to obtain; the requirement for equipment is simple, the preparation method is simple, and the cost is low; a synthesized target product has good chemical stability and high luminous efficiency.

Description

technical field [0001] The invention relates to the field of red fluorescent materials, in particular to a Mn 4+ Ion-doped aluminum oxide lithium red fluorescent material and preparation method thereof. Background technique [0002] With the development of the world's economy and society, environmental protection and energy shortages have attracted more and more attention. Human beings have studied many methods to protect the environment and reduce energy consumption. In the lighting industry, compared with traditional incandescent lamps and fluorescent lamps, white LEDs have the advantages of small size, low power consumption, long life, environmental protection, and energy saving. Under the same brightness conditions, the power consumption of LED lamps is only one tenth of that of incandescent lamps, and its service life is 100 times that of incandescent lamps. The LED light source has no infrared light radiation, no secondary pollution caused by the rupture of the fluor...

Claims

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Application Information

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IPC IPC(8): C09K11/64
CPCC09K11/645
Inventor 廖金生王祺温和瑞陈景林傅俊祥
Owner JIANGXI UNIV OF SCI & TECH