LIGHT EMITTING DEVICE, ILLUMINATING APPARATUS, AND LIGHT EMITTING METHOD

摘要

A headlamp emits illumination light obtained by mixing a laser beam with fluorescent light. The headlamp includes a semiconductor laser that emits the laser beam and a light emitting unit including a fluorescent material that receives the laser beam and emits the fluorescent light. A peak wavelength of the laser beam emitted from the semiconductor laser is longer than a wavelength at which an external quantum efficiency of the fluorescent material is at a maximum.