| 摘要 |
PURPOSE: A preparation method for a cathode fluorescent substance of a lamp is provided to freely control the particle size of a fluorescent substance to a level suitable for the lighting and to enhance the reactivity by adding a flux. CONSTITUTION: A preparation method for a cathode fluorescent body of a lamp comprises a step of adding a flux in the manufacture of a fluorescent substance represented by chemical formula 1: A_xM_yO_4:R_z. In chemical formula 1, A is at least one kind of element or a mixture selected from the group consisting of Sc, Y, Gd, Al, Ga and In; M is at least one kind of element or a mixture selected from the group consisting of V, Nb and Ta; R is at least one kind of element or a mixture selected from the group consisting of Ce, Pr, Sm, Eu, Tb, Dy, Er, Tm and Yb; and x, y, and z are x>0, y>0, 1×10^(-3)<=z<=1.
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