COATED PHOSPHOR, METHOD FOR PRODUCING THE SAME AND LIGHT-EMITTING DEVICE COMPRISING THE COATED PHOSPHOR

摘要

PROBLEM TO BE SOLVED: To provide a coated phosphor having high efficiency and dispersibility for stabilizing characteristics and to provide a method for producing the coated phosphor and to provide a light-emitting device emitting good white luminescence using the coated phosphor.

SOLUTION: The present invention relates to a coated phosphor prepared by coating an europium-activated silicate represented by general formula (5): 2(M51-aEua)O-SiO2(wherein M5is at least one kind of element selected from Mg, Ca, Sr and Ba; 0.005≤a≤0.10) with microparticles composed of at least one kind of compound selected from a group consisting of inorganic oxides and metal phosphates, and a method for producing the coated phosphor. The present invention further relates to a light emitting device having a luminous element composed of a gallium nitride-based semiconductor emitting primary light and a wavelength converting part containing the coated phosphor and absorbing the primary light and emitting secondary light having a peak wavelength not shorter than that of the primary light.

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