Blue fluorescent powder for white-light LED and preparation method thereof
A technology of blue phosphor and white light, applied in the field of blue phosphor for white light LED and its preparation, can solve the problems of low purity and luminous performance of phosphor, complicated spray pyrolysis process, and difficulty in large-scale production, etc. Good chemical stability and thermal stability, shortened chemical reaction time, the effect of short time
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[0024] Example 1
[0025] According to chemical formula Ca 0.98 SiO 3 :0.02Eu 2+ Weigh Ca(NO 3 ) 2 ·4H 2 O(A.R.) 0.98mol, H 2 SiO 3 (A.R.)1mol and Eu(NO 3 ) 3 ·6H 2 O(A.R.) 0.02mol; then weigh 0.1wt% of the surfactant sodium dodecylbenzene sulfonate and flux H of the total mass of the above drugs 3 BO 3 ; Will weigh the good Ca(NO 3 ) 2 ·4H 2 O, H 2 SiO 3 , Eu(NO 3 ) 3 ·6H 2 O. Surfactant and ligand NH 4 HCO 3 (The ratio of reactant to ligand is 1:3) Mix thoroughly, then ball mill, add lubricant acetone during ball milling, the amount of lubricant added is limited by the dispersion of the ball milling system until the reactant reacts with the ligand completely; Suction filtration, washing, drying to obtain the precursor powder; after mixing the precursor powder and the flux uniformly, calcining in a reducing atmosphere provided by the combustion of activated carbon powder, the calcining temperature is 1250°C, and the calcining time is 1.5 hours. Target product.
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[0026] Example 2
[0027] According to chemical formula Ca 0.96 SiO 3 :0.04Eu 2+ Weigh Ca(NO 3 ) 2 ·4H 2 O(A.R.)0.96mol, H 2 SiO 3 (A.R.)1mol and Eu(NO 3 ) 3 ·6H 2 O(A.R.)0.04mol; then weigh 0.4wt% of the surfactant sodium dodecylbenzene sulfonate and mixed flux H of the total mass of the above drugs 3 BO 3 And MgF 2 (Mixed mass ratio is 1:1); the weighed Ca(NO 3 ) 2 ·4H 2 O, H 2 SiO 3 , Eu(NO 3 ) 3 ·6H 2 O, surfactants and ligands (NH 4 ) 2 CO 3 (The ratio of reactant to ligand is 1:2) Fully mix, then ball mill, add lubricant acetone during ball milling, the amount of lubricant added is limited by the ball milling system to maintain dispersion, until the reactant reacts with the ligand completely; Suction filtration, washing, drying to obtain the precursor powder; after mixing the precursor powder and the flux uniformly, calcining in a reducing atmosphere provided by the combustion of activated carbon powder, the calcining temperature is 1250°C, and the calcining time is 1.5 hours...
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[0028] Example 3
[0029] According to chemical formula Ca 0.94 SiO 3 :0.06Eu 2+ Weigh Ca(NO 3 ) 2 ·4H 2 O(A.R.)0.94mol, H 2 SiO 3 (A.R.)1mol and Eu(NO 3 ) 3 ·6H 2 O(A.R.)0.06mol; then weigh 0.7wt% of the total mass of the above drugs, the surfactant sodium dodecylbenzene sulfonate and the mixed flux H 3 BO 3 And Li 2 CO 3 (Mixed mass ratio is 1:1); the weighed Ca(NO 3 ) 2 ·4H 2 O, H 2 SiO 3 , Eu(NO 3 ) 3 ·6H 2 O. Surfactant and ligand C 2 H 2 O 4 (The ratio of reactant to ligand is 1:2) Fully mix, then ball mill, add lubricant acetone during ball milling, the amount of lubricant added is limited by the ball milling system to maintain dispersion, until the reactant reacts with the ligand completely; Suction filtration, washing, drying to obtain the precursor powder; after mixing the precursor powder and the flux uniformly, calcining in a reducing atmosphere provided by the combustion of activated carbon powder, the calcining temperature is 1250°C, and the calcining time is 1.5 hour...
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