| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light source device which uses a phosphor layer having a solid light source emitting blue light and a β sialon phosphor and which can restrain variation of output (light emission intensity) even when the wavelength of the solid light source emitting blue light is in the wavelength range of 460 nm to 490 nm. <P>SOLUTION: A light source device comprises: a solid light source 5 to emit blue light; a phosphor layer 2 containing at least one kind of phosphor, which is excited by the blue light from the solid light source 5 and which emits phosphor light of the wavelength longer than the wavelength of the blue light from the solid light source 5. The phosphor layer 2 contains as a phosphor emitting green light a β sialon phosphor with at least Yb (ytterbium) activated. <P>COPYRIGHT: (C)2012,JPO&INPIT |
