Borate blue luminescent fluorescent powder suitable for near ultraviolet excitation, preparation method thereof and white light LED (light-emitting diode) device
A technology of near-ultraviolet light and fluorescent powder, applied in the direction of luminescent materials, chemical instruments and methods, semiconductor devices, etc., can solve the problems that cannot meet the pursuit of high-quality LED and healthy lighting, and achieve easy industrial production, low preparation temperature, The effect of simple process
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[0029] The present invention is suitable for borate blue luminescent fluorescent powder excited by near ultraviolet light, and its general chemical formula is: CsBa 1-x B 9 o 15 :xEu 2+ (0<x≤0.05). The preparation method of the borate blue luminescent phosphor suitable for near-ultraviolet light excitation specifically includes the following steps:
[0030] (1) Accurately weigh the general formula CsBa according to the stoichiometric ratio 1-x B 9 o 15 :xEu 2+ Compounds containing Cs, Ba, B, and Eu elements are used as raw materials, and the raw materials are ground and mixed uniformly to obtain a raw material mixture;
[0031] (2) Put the raw material mixture obtained in step (1) into a corundum crucible, pre-fire it in a box furnace, grind and mix it after cooling to room temperature, and obtain an intermediate;
[0032] (3) Grind the intermediate obtained in step (2) into a powder, press it into a disc under a press, place it in a tube furnace protected by a reducin...
Embodiment 1
[0036] According to the chemical formula CsBa 0.98 B 9 o 15 :0.02Eu 2+ The stoichiometric ratio of each element in , accurately weighed: 5mmolCs 2 CO 3 , 9.8mmolBaCO 3 , 90mmolH 3 BO 3 , 0.1mmolEu 2 o 3. After grinding and mixing, put it into a corundum crucible, then pre-fire it in a box furnace, heat it up to 500°C and keep it warm for 4 hours, cool it down to room temperature naturally, and discharge it, grind it into powder and put it under the tablet press (pressure setting is 16MPa) Press into discs. After loading the corundum crucible with corundum boat, put 10% H 2 -90%N 2 (Volume ratio) In a high-temperature tube furnace with a mixed atmosphere, the temperature was raised to 800°C for calcination, and the holding time was 4h. After natural cooling to room temperature, the material is discharged, ground into powder, pressed into tablets again and calcined under the same calcination conditions, and ground into powder after cooling to obtain a phosphor sampl...
Embodiment 2
[0043] According to the chemical formula CsBa 0.995 B 9 o 15 :0.005Eu 2+ The stoichiometric ratio of each element in , accurately weighed: 5mmolCs 2 CO 3 , 9.95mmolBaCO 3 , 90mmolH 3 BO 3 , 0.025mmolEu 2 o 3 . After grinding and mixing, put it into a corundum crucible, then pre-fire it in a box furnace, raise the temperature to 500°C, keep it warm for 2 hours, cool it down to room temperature naturally, and discharge it, grind it into powder and put it under the tablet press (the pressure is set at 18MPa) Press into discs. After loading the corundum crucible with corundum boat, put 10% H 2 -90%N 2 (Volume ratio) In a high-temperature tube furnace with a mixed atmosphere, the temperature was raised to 800°C for calcination, and the temperature was kept for 4 hours. After natural cooling to room temperature, the material is discharged, ground into powder, pressed into tablets again and calcined under the same calcination conditions, ground into powder after cooling,...
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