Light emitting device, illumination device, and vehicle headlamp
View Patent ↗An illumination device 1 which is a light emitting device capable of emitting white light, includes: a laser element 2 for emitting a blue laser beam; a light emitting section 4 for generating fluorescence by be being irradiated with the blue laser beam emitted from the laser element 2 ; and a parabolic mirror 5 for reflecting the fluorescence generated from the light emitting section 4 , the parabolic mirror 5 being disposed on an irradiated surface side which irradiated surface is a surface of the light emitting section 4 which surface is irradiated with the blue laser beam. This allows the illumination device 1 to efficiently project the white illumination light.
1. A light emitting device capable of emitting white light, comprising:
an excitation light source for emitting blue excitation light and comprising a plurality of semiconductor lasers; and
a light emitting section containing a fluorescent material that emits fluorescence in an irradiated surface of the light emitting section when irradiated with the blue excitation light source, the irradiated surface being a surface to be irradiated with the blue excitation light,
the light emitting section further containing an excitation light scatterer in a form of particles in the irradiated surface, the excitation light scatterer being different from the fluorescent material and scattering the blue excitation light with which the irradiated surface is irradiated,
particles of the fluorescent material and the excitation light scatterer being irradiated with the blue excitation light in the irradiated surface, and
the plurality of semiconductor lasers being configured so that excitation blue laser beams from the semiconductor lasers are superposed on each other at a portion of the irradiated surface of the light emitting section.
2. The light emitting device as set forth in claim 1 , wherein:
chromaticity of light outputted from the light emitting device is controlled by a ratio between an area of a region containing the fluorescent material and an area of a region containing the excitation light scatterer in the irradiated surface.