| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a white light-emitting device using a fluorophor which is excited with an excitation light source emitting light in a range of from near ultraviolet light to visible light and has emitted light colors from a green color system to a yellow color system whose wavelengths are converted. <P>SOLUTION: This white light-emitting device which uses a light-emitting element excited at 400 nm and has a fluorophor converting the wavelengths of light emitted from the light-emitting element, wherein the fluorophor comprises an oxynitride fluorophor represented by the general formula: L<SB>X</SB>M<SB>Y</SB>O<SB>Z</SB>N<SB>((2/3)X+(4/3)Y-(2/3)Y-(2/3)Z)</SB>:R (L is at least one group II element selected from the group consisting of Be, Mg, Ca, Sr, Ba, and Zn; M is at least one group IV element selected from the group consisting of C, Si, Ge, Sn, Ti, Zr, and Hf; O is an oxygen element; N is a nitrogen element; R is a rare earth element; 0.5<X<1.5; 1.5<Y<2.5; and 1.5<Z<2.5), a fluorophor emitting blue color light, and a fluorophor emitting red color light. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
