Blue light excited green fluorescent powder for white light light-emitting diode (LED) and preparing method thereof
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A green fluorescent powder and blue light excitation technology, applied in the field of green fluorescent powder, can solve problems such as poor color rendering and weak luminous intensity, and achieve the effects of improved luminous brightness and intensity, simple operation, and high commercial use value
Inactive Publication Date: 2012-10-31
南京工大光电材料研究院有限公司
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Problems solved by technology
Specifically, the blue LED chip plus YAG:Ce 3+ The method of yellow phosphor has been commercialized, but its color rendering is poor
The second is to coat green and red phosphors on the blue LED chips, but the efficiency of the red phosphors needs to be greatly improved
Although the green fluorescent powder described in this patent has a wide range of excitation spectrum, the luminous intensity of the green fluorescent material is relatively weak
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Embodiment 1
[0018] Embodiment 1: take by weighing Sc 2 o 3 7.935g, CaCO 3 5.405g, BaCO 3 21.680g, CeO 2 1.720g, H 2 SiO 3 9.275g, H 3 BO 3 0.092g, LiF0.005g, the above raw materials are all analytically pure, add deionized water to the above raw materials for wet mixing, then ball mill for 10h, and then dry, at 1200 ° C, H 2 and N 2 Calcined for 3h under the mixed gas reducing condition, where H 2 Accounting for 5% of the total volume of the mixed gas, the molecular composition is Ca 1.080 Ba 2.192 sc 2.302 Si 2.378 o 11.356 : Ce 0.002 sample.
Embodiment 2
[0019] Example 2: The weighed raw materials, flux content and manufacturing method are the same as in Example 1, the difference is that the calcination temperature is 1000°C, and the obtained molecular composition is Ca 1.080 Ba 2.192 sc 2.302 Si 2.378 o 11.356 : Ce 0.002 sample.
Embodiment 3
[0020] Example 3: The weighed raw materials, flux content and manufacturing method are the same as in Example 1, the difference is that the calcination temperature is 1300°C, and the molecular composition is Ca 1.080 Ba 2.192 sc 2.302 Si 2.378 o 11.356 : Ce 0.002 sample.
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Abstract
The invention relates to a blue light excited green fluorescent powder for a white light LED and a preparing method thereof. The fluorescent powder can be used for manufacturing white LEDs, the excitation spectrum range is between 350 nanometers and 540 nanometers, and the emission spectrum range is between 450 nanometers and 700 nanometers. The structural formula of the fluorescent powder is MaScbSicOd:Cex, wherein, M is composed of at least one of Ca, Sr and Ba, a, b, c, d and x are molar coefficients, and the ranges are respectively: 2<=a<=4, 1<=b<=3, 2<=c<=4, 9<=d<=13, 0.001<=x<=0.2, 4<=(a+b+x)<6, and 11<(c+d)<16. The preparing method includes preparing raw materials according to the structural formula MaScbSicOd:Cex and stoichiometric numbers, adding fluxing agents into the materials, subjecting the mixture to wetting and mixing with deionized water, ball milling, stoving, reduction roasting and post-processing to obtain the material. The blue light excited green fluorescent powder for the white light LED has the advantages that the luminance is high, the particle size is uniform, the excitation wavelength is wide, the emission wavelength can be adjusted according to needs, the chemical stability is good, and the like; and the preparing method is simple, pollution-free, and low in cost.
Description
technical field [0001] The invention relates to a green fluorescent powder for white LEDs excited by blue light, and provides a preparation method of the fluorescent powder, which belongs to the field of luminescent materials or the field of semiconductor lighting. Background technique [0002] White LEDs can be obtained by coating highly efficient phosphors that can be effectively excited by blue light and emit yellow light on the blue LED chips. The successful research of white LED light source has created conditions for the application of LED in general lighting. White light LED is also known as the fourth-generation green lighting source. Compared with traditional incandescent and fluorescent lamps, it has many advantages: such as solidification, small size, long life, durability, stable performance, fast luminous response, impact resistance, etc. , so it is widely used in general lighting, indicator lights, signal lights and other fields. [0003] There are many ways ...
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