Patent ID: 8388863

Claim:
A method for preparing a phosphor for UV and long-wavelength excitation represented by the formula (1) below comprising: (a) stoichiometrically mixing a strontium precursor, a barium precursor, a zinc precursor, at least one alkaline earth metal precursor, and a silica precursor, as matrix components, and a rare-earth metal precursor, as an active agent component; (b) drying the resultant mixture at 100-150° C. to prepare a phosphor precursor; and (c) heat-treating the phosphor precursor at 800 to 1500° C. under a mixed gas atmosphere of nitrogen and hydrogen with a ratio of 75-98 to 2-25 by volume to prepare a phosphor for UV and long-wavelength excitation: (Sr 1-x-y-z A x Ba n Zn y ) 3 SiO 5 :Re z (1) wherein A is at least one alkaline earth metal selected from Ca and Mg, Re is a rare-earth metal, 0.001≦x≦0.5, 0.001≦y≦0.5, 0<z<0.2 and 0<n<1.