| 摘要 |
<p>A phosphor improved in luminance deterioration with time under a vacuum ultraviolet irradiation, a phosphor paste composition, and a vacuum ultraviolet excitation light emitting element high in luminance retaining rate and improved in luminance. An alkaline earth aluminate phosphor which is a phosphor represented by formula a(M1-XEuX)O ·6Al2O3 (in the formula, M is at least one kind of alkaline earth metal element selected from a group consisting of Ba, Sr and Ca, x and a respectively satisfy 0<x<1 and 0.9≤a≤1.5), and which has a wide-band peak over an angle region of diffraction angle (2θ) of 28°-31° of powder diffraction X-ray spectrum by CuKαl characteristics X-ray; and vacuum ultraviolet excitation light emitting element provided with a fluorescent film consisting of the phosphor.</p> |
