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.