LIGHT-EMITTING DEVICE, VEHICULAR LIGHTING FIXTURE COMPRISING THE DEVICE, AND HEAD LAMP

摘要

A light-emitting device comprising a light source which emits excitation light and a fluorescent substance which absorbs the excitation light to emit light in combination, wherein a fluorescent substance comprising an ± type SiAlON represented by the general formula: (Ca ± ,Eu ² ) (Si,Al) 12 (O,N) 16 (1.5 < ± + ² < 2.2, 0 < ² < 0.2, O/N ‰¦ 0.04) as a main component and having a specific surface area of 0.1 to 0.35 m 2 /g is used as the fluorescent substance. This light-emitting device shows little color change due to temperature change and efficiently emits light, even when it is used in a high temperature environment, and it is especially suitable for lighting apparatuses for vehicles such as headlamps.