| 摘要 |
PROBLEM TO BE SOLVED: To provide a rare earth phosphovanadate salt fluorescent material excited by ultraviolet light in a good efficiency to emit red-colored light and having a high light-emitting intensity, and further a fluorescent lamp having a high lamp light flux and having a wide red color-reproducing range. SOLUTION: This fluorescent material expressed by general formula: (R<SB>1-a</SB>Eu<SB>a</SB>)MO<SB>4</SB>-bCaO [wherein, R is at least 1 kind of an element selected from Y, Gd; M is at least 1 kind of an element selected from V, P; 0.001≤a≤0.2; and 5×10<SP>-7</SP>≤b≤3×10<SP>-5</SP>] is the rare earth phosphovanadate fluorescent material excited by the ultraviolet light in the high efficiency, emitting red colored light and having the high light-emitting intensity, and the fluorescent lamp by using the same has the high lamp light flux and the wide red color-reproducing range. COPYRIGHT: (C)2008,JPO&INPIT
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