| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a phosphor that has high color rendering properties, provides a high-luminance light emitting device and emits lights from green to yellow, to provide a light emitting device using the phosphor, an image display and a lighting apparatus including the light emitting device. <P>SOLUTION: The phosphor comprises a compound of garnet structure represented by general formula (I) M<SP>1</SP><SB>a</SB>M<SP>2</SP><SB>b</SB>X<SB>c</SB>M<SP>3</SP><SB>d</SB>M<SP>4</SP><SB>3</SB>O<SB>e</SB>[M<SP>1</SP>is Na and/or Li; M<SP>2</SP>is a divalent metal element; X is a metal element of luminescent central ion consisting essentially of Ce; M<SP>3</SP>is a trivalent metal element except X; M<SP>4</SP>is a tetravalent metal element; a, b, c, d and e are each a number to satisfy 0.001≤a≤0.5, 2.5≤b≤3.3, 0.005≤c≤0.5, 1.5≤d≤2.5 and e=ä(a+b)×2+(c+d)×3+12}/2] as a matrix in which a metal element of luminescent central ion is contained. <P>COPYRIGHT: (C)2007,JPO&INPIT |
