Light emitting device, vehicle headlamp, illumination device, and vehicle

摘要

A headlamp 1 includes (i) a laser element 2 for emitting a laser beam, (ii) a light emitting section 4, including a sealing material made from an inorganic material, for emitting fluorescence upon receiving the laser beam emitted from the laser element 2, and (iii) a heat sink 7 for releasing, via a contact surface of the heat sink 7 which contact surface is in contact with the light emitting section 4, heat generated in the light emitting section 4 in response to the laser beam emitted onto the light emitting section 4, the light emitting section 4 existing within a range which is determined on the basis of the contact surface and with which desired heat releasing efficiency is obtained.

主权项

1. A light emitting device comprising:
an excitation light source for emitting excitation light; a light emitting section, including a sealing material made from an inorganic material, for emitting fluorescence upon receiving the excitation light emitted from the excitation light source; and a heat releasing section having a contact surface and a bottom surface opposite from the contact surface, the contact surface of the heat releasing section being in contact with the light emitting section for releasing heat generated in the light emitting section in response to the excitation light emitted onto the light emitting section, wherein the light emitting section and the heat releasing section are provided so that the light emitting section is located entirely within a range of 0.2 mm or less from the contact surface, the excitation light source is a semiconductor laser and provided on a side of the bottom surface with respect to the heat releasing section, the heat releasing section is made of a rigid transparent material, the excitation light passes through the heat releasing section so that the light emitting section is irradiated with the excitation light, and the heat releasing section is placed between the excitation light source and the light emitting section so that the excitation light enters a light incident surface of the light emitting section and fluorescent light is released from a surface of the light emitting section, which is opposite from the light incident surface.