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
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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.
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Gas discharge lamp usageLuminescent compositions
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