ALKALINE EARTH ALUMINATE PHOSPHOR, PHOSPHOR PASTE COMPOSITION, AND VACUUM ULTRAVIOLET-EXCITABLE LUMINOUS ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide an alkaline earth aluminate phosphor which emits blue light with a high luminance under the excitation by vacuum ultraviolet (VUV) rays with wavelengths of 200 nm or less while hardly exhibiting luminance degradation; a paste composition of the same; and a vacuum ultraviolet ray- excitable luminous element which hardly suffer from the degradation in luminance and efficiently sustains the luminescence. SOLUTION: This alkaline earth aluminate phosphor is represented by the formula: aMIIO 6Al2O3:EuX'MIIIy(wherein MII is at least one alkaline earth element selected from among Ba, Sr and Ca; MIII is at least one element selected from among Sc, Y, Gd and In; x, y and a are each a number satisfying: 0