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

• Main Authors: TAYA, SHUICHI, MIYAKE, YASUYUKI, OCHIAI, AKIFUMI, EMOTO, HIDEYUKI, IBUKIYAMA, MASAHIRO
• Format: Patent
• Language: English; French; German
• Published: 30.06.2010
• Subjects: ADHESIVES; BASIC ELECTRIC ELEMENTS; BLASTING; CHEMISTRY; DYES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; HEATING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21Sand F21V, RELATING TO THEFORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THELIGHT EMITTED; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21Sand F21V, RELATING TO USESOR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS; LIGHTING; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; MECHANICAL ENGINEERING; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-PORTABLE LIGHTING DEVICES; PAINTS; POLISHES; SEMICONDUCTOR DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

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.