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

Inactive Publication Date: 2010-06-16
SICHUAN UNIV
5 Cites 7 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, due to the high cost of the sol-gel method, it is difficult to achieve large-scale production; the phosphor powder prepared by the combustion method has low purity and luminescent performance; the spray pyrolysis method has complicated processes and high equipment requirements, making it...
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Abstract

The invention relates to blue florescent powder for a white-light LED, belonging to the technical field of rare earth luminescent materials. The blue florescent powder has a chemical formula of: Ca<1-x>SiO3:xEu2+, wherein x is more than 0 and less than 0.2. The preparation method comprises the following steps of: respectively weighing calcium salts, silicic acid, europium nitrate and an appropriate amount of surfactant and fluxing agent according to the stoichiometric ratio in the chemical formula; fully mixing the weighed reactant, the surfactant and an appropriate amount of ligands and then ball-milling, and adding a lubricating agent when in ball-milling; filtering, washing and drying to obtain a precursor; evenly mixing the precursor with the fluxing agent, and then calcining under the reducing atmosphere to obtain the required florescent powder. In the invention, the blue florescent powder for the LED is prepared by adopting a mechanical force solid-phase chemical reaction method, the specific surface area of the reactant is increased by utilizing the shearing force and the impact force generated in the ball-milling process, the contact face and the diffusion speed of the reactant are improved, and the required time in the chemical reaction is shortened. The prepared fluorescent powder has high luminescent strength as well as good color rendering property and stability, and is suitable for LEDs excited by ultraviolet and near ultraviolet.

Application Domain

Gas discharge lamp usageLuminescent compositions

Technology Topic

Solid phasesChemistry +20

Image

  • Blue fluorescent powder for white-light LED and preparation method thereof
  • Blue fluorescent powder for white-light LED and preparation method thereof
  • Blue fluorescent powder for white-light LED and preparation method thereof

Examples

  • Experimental program(10)

Example Embodiment

[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.

Example Embodiment

[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. Target product.

Example Embodiment

[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 hours. Target product.
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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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