| 摘要 |
<p>To provide a substrate for a light-emitting device, which is provided with a reflection layer having a high optical reflectance and being less susceptible to deterioration of the reflectance due to corrosion and which has an improved light extraction efficiency, and a light-emitting device employing such a substrate.
A substrate (10) for mounting a light-emitting element, which comprises a substrate main body (1) having a mounting surface (1a) on which a light-emitting element is to be mounted, a reflection layer (2) formed on a part of the mounting surface of the substrate main body and containing silver to reflect light emitted from the light-emitting element, and a vitreous insulating layer (3) formed on the reflection layer, wherein the vitreous insulating layer contains a glass comprising, as its constituting components, at least SiO 2 , at least one of Al 2 O 3 and B 2 O 3 , and an alkali metal oxide (containing at least one member selected from Li 2 O, Na 2 O and K 2 O), wherein by contents as represented by mol% based on oxides of the above components, (Li 2 O+Na 2 O+K 2 O)-Al 2 O 3 is from -20 to 1.5%, and SiO 2 +3xA1 2 O 3 is at most 90%.</p> |
