Patent ID: 8604499

Claim:
A light-emitting device, comprising: a substrate having a conductor layer formed on a surface thereof; a light-emitting element disposed on the conductor layer; and an overcoat layer formed between the conductor layer and the light-emitting element; wherein the overcoat layer is made a borosilicate glass, the borosilicate glass comprising, by mol % based on oxides: 62 to 84% of SiO 2 ; 10 to 25% of B 2 O 3 ; 0 to 5% of Al 2 O 3 ; 0 to 5% in total of at least one of Na 2 O and K 2 O; 62 to 84% in total of SiO 2 and Al 2 O 3 ; 0 to 10% of MgO; and 0 to 5% of at least one of CaO, SrO, and BaO.