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US 11,976,004 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.
Claims7
A glass, comprising:
- B2O3 from 9.0 mol % to 33.0 mol %;
- La2O3 from 15.0 mol % to 50.0 mol %;
- SiO2 at greater than 0.0 mol %, wherein a ratio of SiO2 (expressed in mol %) to a sum (expressed in mol %) of SiO2 and B2O3 (SiO2/(SiO2+B2O3)) is from 0.05 to 0.95;
- 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:
- Nb2O5 is from 0.0 mol % to 12.0 mol %;
- TiO2 is from 0.0 mol % to 40.0 mol %;
- ZrO2 is from 0.0 mol % to 13.5 mol %;
- Y2O3 is from 0.0 mol % to 3.0 mol %;
- ZnO is from 0.0 mol % to 0.8 mol %;
- Li2O is from 0.0 mol % to 0.5 mol %;
- and
- Ta2O5 is from 0.0 mol % to 1.5 mol %, and
- wherein the glass has a refractive index parameter Pn and a density parameter Pd that satisfy formula (IX):
- Pn−(1.000+0.19*Pd)>0.000 (IX)
- 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+
- 0.00608069*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 density parameter Pd is calculated according to formula (VII):
- Pd=−0.018843*Al2O3−0.020477*B2O3+0.021988*BaO+
- 0.074733*Bi2O3−0.00243*CaO+0.100258*Er2O3+
- 0.07427*Gd2O3−0.018568*K2O+0.06037*La2O3−0.0089*Li2O−0.00909*Na2O+0.00625*Nb2O5+0.068993*Nd2O3−0.038868*P2O5+0.04853*PbO−0.018196*SiO2+
- 0.013124*TeO2−0.00529*TiO2+0.044564*WO3+
- 0.022887*Y2O3+0.097857*Yb2O3+0.0077*ZnO+
- 0.012501*ZrO2+4.16819 (VII)
- and
- further wherein the glass has a transmittance index Ti of 0.532 or greater, 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
- +
- T
-
- i
-
- O
- 2
- +
- N
-
- b
- 2
-
- O
- 5
- )
- (
- III
- )
- where each oxide listed in formula (VI), formula (VII), and formula (III) refers to the amount of the oxide, expressed in mol %, in the glass;
- and
- further wherein none of the ranges is modified by the term “about”.
103 more elements
Dependencies are inferred from the claim text.