FLUORESCENT SUBSTANCE, METHOD FOR PRODUCING THE SAME AND DISPLAY DEVICE AND LUMINOUS DEVICE USING THE SAME FLUORESCENT SUBSTANCE

摘要

PROBLEM TO BE SOLVED: To obtain a fluorescent substance having suppressed lowering of luminous brightness with ultraviolet rays or electron beams and having a reduced change in chromaticity. SOLUTION: This fluorescent substance is produced by keeping a fluorescent substance body 16 capable of emitting light by excitation with the ultraviolet rays or electron beams in a gas atmosphere containing hydrogen 1 or fluorine element under the atmospheric pressure or above, diffusing the hydrogen 1 or the fluorine element into the fluorescent substance body 16 and then irradiating the resultant fluorescent substance body 16 with ultraviolet radiations.