| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluorescent material keeping high luminance even after the lapse of irradiation time of an excitation source. SOLUTION: The compound oxide for fluorescent materials has a composition obtained by substituting a part of Mg of a compound expressed by formula (1) with one or more elements (M<SP>3</SP>) selected from the group 5 elements and group 6 elements and having an M<SP>3</SP>/(Mg+M<SP>3</SP>) molar ratio of≥0.003 and≤0.006. Formula (1); 3M<SP>1</SP>O-aMgO-bM<SP>2</SP>O<SB>2</SB>(M<SP>1</SP>is one or more elements selected from Ba, Sr and Ca; M<SP>2</SP>is Si and/or Ge; a is≥0.9 and≤1.1; and b is≥1.8 and≤2.2). The invention further provides a fluorescent material composed of the above compound oxide for fluorescent material and incorporated with M<SP>4</SP>as an activator, and a fluorescent material obtained by substituting a part of the element M<SP>2</SP>of the above compound oxide with M<SP>4</SP>(M<SP>4</SP>is one or more elements selected from rare earth elements and Mn). COPYRIGHT: (C)2008,JPO&INPIT
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