Method for producing aluminate phosphor

摘要

An alkaline earth metal compound containing no fluorine atoms in its molecules, a rare earth compound containing no fluorine atoms in its molecules, and an aluminum compound containing no fluorine atoms in its molecules are fired in a high-temperature reducing atmosphere ranging from 1600 to 2000 DEG C, so that an aluminate phosphor, the particle diameter and shape thereof are controlled, is provided. A mixture of 22wt% of barium carbonate (12), 11wt% of basic magnesium carbonate (13), 65wt% of spherical alpha-alumina (11) of 10 mu m diameter and 2wt% of europium oxide (14) is fired in a mixed gas atmosphere consisting of gaseous hydrogen of 5 volume % and gaseous nitrogen. The temperature is raised at 400 DEG C/hr, and lowered at 400 DEG C/hr after firing for two hours at 1700 DEG C. As a result, a spherical aluminate phosphor (15) of 10 mu m diameter, which is expressed by formula (Ba0.9,Eu0.1)MgAl10O17 is obtained. <IMAGE>