| 摘要 |
A glass for encapsulating an optical element that can seal the optical element at a temperature in the vicinity of 500° C., and a glass-encapsulated light-emitting device encapsulated with the glass, are provided. A glass for encapsulating an optical element, which is a glass consisting essentially of, in terms of mol % of oxide, from 35 to 55% of TeO2, from 20 to 50% of B2O3, from 10 to 30% of ZnO, and from 0.1 to 5% of one type or a combination of at least two types selected from the group consisting of Y2O3, La2O3, Gd2O3 and Bi2O3, wherein the value of (B2O3+ZnO)/TeO2 is at least 0.9, the glass contains substantially no fluorine, and when the content of ZnO is at most 15%, the content of TeO2 is at most 46%.
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