GLASS COMPOSITION AND MEMBER HAVING THE SAME ON SUBSTRATE

摘要

A glass composition having high refractive index, softening property at low temperature and small average thermal expansion coefficient, and a member provided with the composition on a substrate, are provided. The glass composition of the present invention has a refractive index (n d ) of from 1.88 to 2.20, a glass transition temperature (T g ) of from 450 to 490°C, and an average thermal expansion coefficient at temperatures from 50°C to 300°C (± 50-300 ) of from 60×10 -7 /K to 90×10 -7 /K, and includes Bi 2 O 3 in an amount of from 5 to 25% in terms of mol% on the basis of oxides.