摘要 |
<P>PROBLEM TO BE SOLVED: To provide a substrate for a light-emitting device including a reflection layer, where light reflectance is high and deterioration in the reflectance caused by corrosion is small, and having improved light extracting efficiency, and also to provide a light-emitting device using the substrate. <P>SOLUTION: The substrate mounting a light-emitting element has: a substrate body including a mounting surface onto which a light-emitting element is mounted; the reflection layer that is formed in one portion on the mounting surface of the substrate body, and includes silver reflecting light emitted from the light-emitting element; and a vitreous insulating layer formed on the reflection layer. The vitreous insulating layer uses at least SiO<SB>2</SB>and at least one of Al<SB>2</SB>O<SB>3</SB>and B<SB>2</SB>O<SB>3</SB>, and an alkali metal oxide as constituents, and is made of glass of -20 to 1.5% (Li<SB>2</SB>O+Na<SB>2</SB>O+K<SB>2</SB>O)-Al<SB>2</SB>O<SB>3</SB>and not less than 90% SiO<SB>2</SB>+3×Al<SB>2</SB>O<SB>3</SB>in terms of a content expressed by mol% based on an oxide basis of each component. <P>COPYRIGHT: (C)2011,JPO&INPIT |