Substrate for mounting light-emitting element, production process thereof and light-emitting device

摘要

To provide a substrate for mounting a light-emitting device, which is provided with a silver reflection layer having a high reflectance and being less susceptible to deterioration of the reflectance due to corrosion and which has an improved light extraction efficiency.;A substrate for mounting a light-emitting element 1, which comprises a substrate main body 2, a silver reflection layer 6 composed mainly of silver or a silver alloy, formed on the substrate main body 2, and a protective layer formed so as to cover the entire surface of the silver reflection layer 6, wherein the protective layer 7 contains an alumina filler and further contains a glass constituting the protective layer 7, having silver ions diffused therein. The concentration of silver ions contained in the glass of the protective layer 7 is at least 0.5 mass % and at most 5.0 mass %.

主权项

1. A substrate for mounting a light-emitting element, which comprises:
a substrate main body having a mounting surface on which the light-emitting element is to be mounted, a reflection layer composed mainly of silver or a silver alloy, formed on the mounting surface of the substrate main body, and a protective layer, formed so as to cover an entire surface of the reflection layer, wherein the protective layer comprises: an alumina filler and a glass which comprises silver ions diffused therein, and wherein the glass is obtained by firing a glass powder comprising, as represented by mol % based on oxides, from 40 to 70% of SiO2, from 1 to 20% of Al2O3, from 5 to 25% of B2O3, from 7 to 40% of CaO, and from 0 to 8% of at least one member selected from the group consisting of Li2O, Na2O and K2O.