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 (nd) of from 1.88 to 2.20, a glass transition temperature (Tg) of from 450 to 490° C., and an average thermal expansion coefficient at temperatures from 50° C. to 300° C. (α50-300) of from 60×10−7/K to 90×10−7/K, and includes Bi2O3 in an amount of from 5 to 25% in terms of mol % on the basis of oxides.