FLUORESCENT SUBSTANCE FOR VACUUM ULTRAVIOLET-EXCITED LIGHT-EMITTING ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide a fluorescent substance for vacuum ultraviolet-excited light-emitting element, having high luminance and little luminance decrease caused by plasma exposure. SOLUTION: This fluorescent substance for vacuum ultraviolet-excited light- emitting element has a composition represented by the composition formula Y1-a-b Gda Tbb Al3 (BO3 )4 [(a) satisfies 0.3<=a<=0.55; and b satisfies 0.003<=b<=0.445] or a composition represented by the composition formula Y1-a-b Gda Eub Al3 (BO3 )4 [(a) satisfies 0.3<=a<=0.55; and b satisfies 0.003<=b<=0.445].