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1. (US20150197445) Bismuth borate glass encapsulant for LED phosphors
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Claims

1. A glass composition comprising in mole percent:
10-30% Bi 2O 3;
greater than 0% Na 2O;
15-50% ZnO, ZnF 2, or a combination thereof;
30-55% B 2O 3;
0-3% SiO 2;
0-1% WO 3;
0-12% BaO, CaO, SrO, or combinations thereof.
2. The glass composition according to claim 1, comprising at least 1% Na 2O.
3. The glass composition according to claim 1, comprising 15-50% ZnO.
4. The glass composition according to claim 1, comprising:
12-20% Bi 2O 3;
5-12% Na 2O;
20-30% ZnO;
38-52% B 2O 3;
0-3% SiO 2;
0-1% WO 3;
1-12% BaO, CaO, SrO, or combinations thereof.
5. The glass composition according to claim 4, comprising:
14-16% Bi 2O 3;
5-11% Na 2O;
22-27% ZnO;
40-51% B 2O 3;
0-3% SiO 2,
0-1% WO 3;
1-11% BaO, CaO, SrO, or combinations thereof.
6. The glass composition according to claim 1, having a refractive index of 1.81-1.83 at 473 nm and a glass transition temperature of 460° C. or less.