Green silicate fluorescent powder with narrow half peak width and preparation method thereof
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A technology of silicate and half-peak width, which is applied in the field of phosphors and its preparation, can solve the problems of low luminance, poor resistance to humidity and heat, and poor particle size uniformity, and achieve uniform crystallization, reduced lattice distortion, and uniform distribution Effect
Active Publication Date: 2017-11-03
HEBEI LIFU CHEM TECH
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[0004] The purpose of the present invention is to provide a green silicate phosphor with a narrow half-peak width and a preparation method thereof, so as to solve the problems of existing silicate phosphors with wide half-peak width, poor particle size uniformity, low luminous brightness, and resistance to heat and humidity. The problem of poor stability
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Embodiment 1
[0032] (1) According to the general chemical formula Sr 0.1 Ba 1.7 Mg 0.05 Cu 0.05 Si 0.9 Ge 0.1 o 4 : 0.08Mn, the molar ratio of each element in 0.02Eu Weigh 0.1mol of SrCO 3 , 1.7mol of BaCO 3 , 0.05mol of MgO, 0.05mol of CuO, 0.1mol of GeO 2 , 0.9mol of SiO 2 , 0.01mol of Eu 2 o 3 , 0.08mol of MnO 2 and 0.05mol of MgCl 2 and 0.03mol of CaCl 2 , carried out in a glove box with water and oxygen content less than 0.1ppm, put the weighed raw materials into a ziplock bag, and fill the bag with an appropriate amount of N 2 Inert gas, shake irregularly and violently for 20 minutes by hand shaking; continue to pour the hand-mixed raw materials into the mixing bottle in a glove box with water and oxygen content less than 0.1ppm, put the ball milling medium in the bottle, and place it in the mixing bottle. On the feeder, mix the materials for 14 hours to obtain the raw material mixture;
[0033] (2) Take out the phosphor crude product and grind and crush it, pass throu...
Embodiment 2-5
[0036] The process steps for preparing phosphors in Examples 2-5 and Comparative Examples 3 and 4 are the same as in Example 1, except that the reaction temperature in step (2) is changed.
[0037] project
Embodiment 6-9
[0039] The process steps for preparing phosphors in Examples 6-9 and Comparative Examples 5-6 are the same as those in Example 1, only the heat preservation reaction time in step (2) is changed.
[0040] project
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Abstract
The invention discloses green silicate fluorescent powder with a narrow half peak width. The silicate fluorescent powder has a general chemical formula of (M1xBa2-x-u-k)(SiyM21-y)O4:uMn<2+>, kM3<2+>, wherein M1 is at least one of Sr, Ca, Mg and Cu, M2 is at least one of Ti, Zr, Ge and Sn, and M3 is one of Eu, Sm and Yb; x is greater than 0 and less than or equal to 0.2, y is greater than 0.8 and less than 1.0, u is greater than 0.05 and less than or equal to 0.15, and k is greater than 0 and less than or equal to 0.05. The invention also discloses a preparation method comprising: weighing raw materials and a fluxing agent, and performing mixing and grinding to obtain a mixture; performing high-temperature sintering on the mixture in a reducing atmosphere, and performing crushing, screening, alcohol washing and drying on the sintered mixture after cooling to obtain the narrow-half-peak wide-green silicate fluorescent powder. The preparation method of the fluorescent powder provided by the invention is simple and easy to control, needs a low sintering temperature during preparation, has a wide process window, and is suitable for large-scale industrial production; the obtained fluorescent powder has a narrow half peak width and a small particle size, is uniform in distribution, narrow in distribution range, good in chemical stability and strong in resistance to heat and humidity, and can be widely applied to LED illumination or display systems.
Description
technical field [0001] The invention relates to a fluorescent powder and a preparation method thereof, in particular to a green silicate fluorescent powder with a narrow half-peak width and a preparation method thereof. Background technique [0002] As a new type of solid light source, LED is known as the fourth generation of green and environmentally friendly lighting sources after incandescent lamps, fluorescent lamps, and high-intensity gas discharge lamps. LED has the characteristics of energy saving and environmental protection, small size, long life, anti-vibration and impact resistance, etc., and is widely used in various fields such as indicator lights, mobile phones, cameras, city night scenes and indoor commercial atmosphere lighting. At present, the typical method of obtaining white LED technical solutions is to use blue LED chips to excite yellow-emitting YAG:Ge 3+ or YAG:Tb 3+ Phosphor powder generates white light through the combination of yellow, green and b...
Claims
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