Back to results
US 12,187,644 B2Granted
Silicoborate and borosilicate glasses having high refractive index and high transmittance to blue light
AssigneeCorning Incorporated
InventorsPaulo Jorge Gaspar Marques, Antoine Marie Joseph Lepicard, Jian Luo, Lina Ma, Alexander I. Priven
Life of this patent
Estimating the term…
Abstract
Glasses containing silicon dioxide (SiO2) and/or boron oxide (B2O3) as glass formers and having a refractive index nd of greater than or equal to 1.80, as measured at 587.56 nm, a density of less than or equal to 5.5 g/cm3, as measured at 25° C., and a high transmittance to, particularly to blue light, are provided. Optionally, the glasses may be characterized by a high transmittance in the visible and near-ultraviolet (near-UV) range of the electromagnetic spectrum and/or good glass forming ability.
Claims16
A glass, comprising:
- SiO2 from greater than or equal to 3.0 mol % and less than or equal to 25.0 mol %;
- B2O3 from 1.0 mol % or greater, wherein a sum of (SiO2+B2O3) is 45.0 mol % or less;
- a total content of divalent metal oxides (RO) of greater than or equal to 8.5 mol % and less than or equal to 15.0 mol %;
- and
- at least one oxide selected from Nb2O5, TiO2, ZrO2, Li2O, Ta2O5, Al2O3, BaO, Bi2O3, CaO, Er2O3, Gd2O3, K2O, Na2O, Nd2O3, P2O5, PbO, TeO2, WO3, Y2O3, Yb2O3, and ZnO, subject to the proviso that:
- Gd2O3 is from 0.0 mol % to 27.0 mol %;
- CaO is from 0.0 mol % to 15.0 mol %;
- Li2O is from 0.0 mol % to 7.0 mol %;
- MgO is from 0.0 mol % to 5.0 mol %;
- Y2O3 is from 0.0 mol % to 1.5 mol %;
- Ta2O5 is from 0.0 mol % to 0.5 mol %;
- BaO is from 0.0 mol % to 14.0 mol %;
- CdO is from 0.0 mol % to 10.0 mol %;
- Bi2O3 is from 0.0 mol % to 20.0 mol %;
- PbO is from 0.0 mol % to 1.0 mol %;
- HfO2 is from 0.0 mol % to 1.0 mol %;
- TeO2 is from 0.0 mol % to 5.0 mol %;
- Nb2O5 is from 0.0 mol % to 25.0 mol %;
- TiO2 is from 0.0 mol % to 18.0 mol %;
- ZnO is from 0.0 mol % to 2.0 mol %;
- fluorine is from 0.0 atomic % to 1.0 atomic %;
- a sum of (SiO2+B2O3+Alk2O+MgO+CaO+SrO+BaO+ZnO) is 69.0 mol % or less, where Alk2O is a total content of alkali metal oxides;
- and
- a sum of (REmOn+TiO2+Nb2O5+ZrO2+Bi2O3+WO3) is 25.0 mol % or greater,
- where REmOn is a total content of rare earth metal oxides, and
- wherein the glass has a refractive index parameter Pn and a transmittance index Ti that satisfy formula (XI)(a):
- Pn−(2.055−0.36*Ti)>0.000 (XI)(a)
- where the refractive index parameter Pn is calculated according to formula (VI):
- Pn=1.81706−0.0035654*Al2O3−0.0038101*B2O3+0.00081216*BaO+0.010373*Bi2O3+0.00013728*CaO+0.0073116*Er2O3+0.0055226*Gd2O3−0.003343*K2O+0.0060806*La2O3−0.0009011*Li2O−0.001967*Na2O+0.0093799*Nb2O5+0.0060396*Nd2O3−0.0061024*P2O5+0.0040356*PbO−0.0032812*SiO2+0.0030562*TeO2+0.0034148*TiO2+0.004267*WO3+0.0034424*Y2O3+0.0071109*Yb2O3+0.00096907*ZnO+0.0026412*ZrO2 (VI)
- and
- where the transmittance index Ti is calculated according to formula (III):
- T
- i
- =
- (
- L
-
- a
- 2
-
- O
- 3
- +
- G
-
- d
- 2
-
- O
- 3
- +
- Z
-
- r
-
- O
- 2
- )
- (
- L
-
- a
- 2
-
- O
- 3
- +
- G
-
- d
- 2
-
- O
- 3
- +
- Z
-
- r
-
- O
- 2
- +
- TiO
- 2
- +
- N
-
- b
- 2
-
- O
- 5
- )
- (
- III
- )
- and each oxide listed in formula (VI) and formula (III) refers to the amount of the oxide, expressed in mol %, in the glass;
- and
- wherein none of the ranges is modified by the term “about”.
96 more elements
Dependencies are inferred from the claim text.