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Red luminous material for LED and producing process thereof
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A red light-emitting and deep-red technology, applied in the field of light-emitting materials, can solve the problems of limited application and narrow emission peak, and achieve the effect of low cost of raw materials, low equipment requirements, and improved market competitiveness.
Inactive Publication Date: 2012-03-28
SOUTH CHINA UNIV OF TECH
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[0003] Traditional Eu 3+ Activated red phosphor is widely used in various lighting and displays due to its high efficiency and high color purity, but Eu 3+ The luminescence of ions is caused by their f-f transition, so the excitation peaks are narrow emission peaks in the near ultraviolet and blue light regions, which limits their application in current white LEDs (Phosphor Handbook, CRC Press, 2006; Practical Applications of Phosphors, CRC Press, 2006)
Commercial lamp powder 3.5MgO.0.5MgF 2 .GeO 2 :Mn 4+ It has been invented for more than 40 years (J.Chem.Phys.1960, 33, 783), and it is still in use, but because the price of the raw materials used is too high, it can only be used in special fluorescent lamps to improve the color rendering index of fluorescent lamps
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example 1
[0018] According to target product Ca 1-x-y Sr x Mg y Al 12-z o 19 :Mn 4+ (wherein x=0, y=0, z=0.01%) each ion stoichiometric ratio, accurately measure the above Ca(Ac) 2 , Al(NO 3 ) 3 , Mn(Ac) 2 After mixing the solution evenly, add urea whose molarmass is 3 times the total molar amount of metal ions, stir to dissolve it, and form a transparent viscous solution, place it on an electric furnace, heat and concentrate until it burns, and obtain a yellow precursor powder. After pre-burning in the air at 500°C for 5 hours, grind it, then sinter in the air at 1300°C for 5 hours, and cool it down to room temperature naturally to get the product. Fluorescent red.
example 2
[0020] According to target product Ca 1-x-y Sr x Mg y Al 12-z o 19 :Mn 4+ (wherein x=0.5, y=0, z=0.1%) each ion stoichiometric ratio, accurately measure the above Ca(Ac) 2 , Sr(NO 3 ) 3 , Al(NO 3 ) 3 , Mn(Ac) 2 After mixing the solution evenly, add citric acid whose molar amount is 3 times the total molar amount of metal ions, stir to dissolve it, form a transparent viscous solution, place it on an electric furnace, heat and concentrate until it burns, and obtain a brown precursor powder. The product is pre-fired in the air at 600°C for 8 hours, then ground, then sintered in the air at 1100°C for 24 hours, and cooled to room temperature naturally to obtain the product. The product emits light under the irradiation of ultraviolet lamp, ultraviolet LED or blue light LED Crimson fluorescent.
example 3
[0022] According to target product Ca 1-x-y Sr x MgyAl 12-z o 19 :Mn 4+ (wherein x=0, y=0.5, z=0.05%) each ion stoichiometric ratio, accurately measure the above Ca(Ac) 2 , Mg(NO 3 ) 3 , Al(NO 3 )3 , Mn(Ac) 2 Solution, after mixing evenly, add citric acid and urea with a molar mass of 1.5 times the total molar amount of metal ions, stir to dissolve, form a transparent viscous solution, place it on an electric furnace, heat and concentrate until it burns, and obtain a brown precursor powder , pre-burn the precursor in the air at 500°C for 5 hours, grind it, and then sinter it in the air at 1100°C for 18 hours, and cool it to room temperature naturally to get the product. The product is irradiated by ultraviolet lamp, ultraviolet LED or blue LED Underneath, it fluoresces dark red.
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Abstract
The invention discloses a red luminescent material used for an LED and a preparation method thereof. The chemical formula thereof is Ca1-x-ySrxMgyAl12-zO19:Mn<4+>z; wherein, x is equal to or larger than 0 and less than 0.5; y is equal to or larger than 0 and less than 1; z is equal to 0.01 to 10 percent; the preparation method is as follows: materials like soluble metal acetate and nitrate are dissolved in water and uniformly mixed according to a stoichiometric ratio and are respectively added with one or a plurality of fuels like carbamide, citric acid, boric acid and glycin for forming a transparent viscous liquid; then the transparent viscous liquid is heated and condensed to be dry for obtaining a yellow or brown powder precursor. The precursor sintered in the air of 500 to 900 DEG C for 5 to 12 hours is cooled and ground and then sintered for 5 to 24 hours in the air of 1100 to 1300 DEG C and then is naturally cooled to the room temperature, thus obtaining the product. The material is used for a white light LED; and the preparation method is 200 to 400 DEG C lower than the traditional synthetic method.
Description
technical field [0001] The invention relates to a luminescent material, in particular to a red luminescent material which can be used for LED and a preparation method thereof. Background technique [0002] White LEDs packaged by yellow phosphor YAG: Ce and blue LEDs are the earliest white LEDs invented, and they are also the mainstream products in the current white LEDs market. However, the color rendering index of such white LEDs is low and cannot meet large-scale lighting needs, because the white light has only yellow and blue components, and less red components. In order to improve the color rendering index of this type of white LEDs, a lot of work has focused on using Gd 3+ Partial replacement of YAG: Y in Ce 3+ Redshift its emission spectrum to increase its emission intensity in the red light region, but this redshift of the emission band needs to be at the expense of luminous intensity and luminous efficiency (J.Electrochem.Soc.2007, 154, J326; Mater . Res. Bull. 20...
Claims
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