Alkali-free cover glass composition, and light extracting member using same

摘要

A glass composition and a light extracting member using the same is provided, where the glass composition does not substantially contain a lead oxide and an alkali metal oxide and has a glass transition temperature of 530� C. or less and acid resistance property. An alkali-free cover glass composition is also provided which does not substantially contain a lead oxide and an alkali metal oxide; has a refractive index (nd) of 1.7 to 2.3; has a glass transition temperature of 530� C. or less; has a dissolution depth of less than 1.3 mum as measured by an acid dipping weight loss measurement method; and contains 8 to 25% of Nb2O5 in terms of mol % on the basis of an oxide thereof.