ALKALINE EARTH ALUMINATE PHOSPHOR, PHOSPHOR PASTE COMPOSITION AND VACUUM ULTRAVIOLET EXCITATION LIGHT EMITTING ELEMENT

摘要

Brightness under vacuum ultraviolet irradiation time is deteriorated with the lapse improved phosphor, a phosphor paste composition, and the luminance sustain ratio is high and provides a vacuum ultraviolet ray-excited light-emitting device has an improved brightness. Formula a (M _1-X Eu _X) O · 6Al ₂ O ₃ (formula M represents at least one alkaline earth metal element selected from the group consisting of Ba, Sr and Ca, x and a are each 0 x 1 and satisfies 0.9≤a≤1.5) with a phosphor represented by the diffraction angle in powder X-ray diffraction spectrum by CuKα1 characteristic X-ray (2θ) is an alkaline earth having a broadband peak over a 28 ° angle of ~31 ° area aluminate phosphor, and a vacuum ultraviolet ray-excited light emitting device having a fluorescent film formed of the phosphor. ; Phosphor, a vacuum ultraviolet ray-excited light-emitting device