PHOSPHOR AND PREPARATION METHOD THEREOF TO PROVIDE HIGH LUMINANCE AND REDUCED PRODUCTION COST, AND WHITE LIGHT EMITTING DEVICE USING THE SAME FOR IMPROVING COLOR SATURATION, COLOR RENDITION AND COLOR STABILITY

摘要

PURPOSE: A phosphor and a preparation method thereof are provided to make the luminance high and reduce the production cost by using a low temperature condition. Further, a white light emitting device using the phosphor is provided to improve the color saturation, color stability and color rendition. The device provides warm white color having a low color temperature. CONSTITUTION: The phosphor is represented by a formula: X(3-y-z)MgSi2O8:yEu2+,zMn2+, wherein X is a metal at least one selected from Ca, Sr and Ba, 0y=0.1, and 0=z1. The method for preparing the phosphor comprises: (a) mixing and milling an X-containing compound, wherein X is as defined above, a Si-containing silicate and an Eu-containing compound; (b) heating the milled mixture under reduction atmosphere; (c) cooling the heated phosphor; and (d) milling the cooled phosphor. The white light emitting device comprises the phosphor and a luminous element chip, wherein the chip emits a light in the range of 340-460nm.