Silicoborate and borosilicate glasses having high refractive index and high transmittance to blue light

Patent metadata

Field	Value
Publication number	US-11976004-B2
Application number	US-202117400444-A
Country	US
Kind code	B2
Filing date	Aug 12, 2021
Priority date	Sep 10, 2020
Publication date	May 7, 2024
Grant date	May 7, 2024

Abstract

Glasses containing silicon dioxide (SiO 2 ) and/or boron oxide (B 2 O 3 ) as glass formers and having a refractive index n d 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/cm 3 , 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.

First claim

What is claimed is:

1. A glass, comprising:
B 2 O 3 from 9.0 mol % to 33.0 mol %;
La 2 O 3 from 15.0 mol % to 50.0 mol %;
SiO 2 at greater than 0.0 mol %, wherein a ratio of SiO 2 (expressed in mol %) to a sum (expressed in mol %) of SiO 2 and B 2 O 3 (SiO 2 /(SiO 2 +B 2 O 3 )) is from 0.05 to 0.95; and
at least one oxide selected from Nb 2 O 5 , TiO 2 , ZrO 2 , Li 2 O, Ta 2 O 5 , Al 2 O 3 , BaO, Bi 2 O 3 , CaO, Er 2 O 3 , Gd 2 O 3 , K 2 O, Na 2 O, Nd 2 O 3 , P 2 O 5 , PbO, TeO 2 , WO 3 , Y 2 O 3 , Yb 2 O 3 , and ZnO, subject to the proviso that:
Nb 2 O 5 is from 0.0 mol % to 12.0 mol %;

TiO 2 is from 0.0 mol % to 40.0 mol %;
ZrO 2 is from 0.0 mol % to 13.5 mol %;
Y 2 O 3 is from 0.0 mol % to 3.0 mol %;
ZnO is from 0.0 mol % to 0.8 mol %;
Li 2 O is from 0.0 mol % to 0.5 mol %; and
Ta 2 O 5 is from 0.0 mol % to 1.5 mol %, and
wherein the glass has a refractive index parameter P n and a density parameter P d that satisfy formula (IX):
P n −(1.000+0.19* P d )>0.000  (IX)

where the refractive index parameter P n is calculated according to formula (VI):
P n =1.81706−0.0035654*Al 2 O 3 −0.0038101*B 2 O 3 +

0.00081216*BaO+0.010373*Bi 2 O 3+0.00013728 *CaO+
0.0073116*Er 2 O 3 +0.0055226*Gd 2 O 3 −0.003343*K 2 O+

0.00608069*La 2 O 3 −0.0009011*Li 2 O−0.001967*Na 2 O+

0.0093799*Nb 2 O 5 +0.0060396*Nd 2 O 3 −0.0061024*P 2 O 5 +

0.0040356*PbO−0.0032812*SiO 2 +0.0030562*TeO 2 +

0.0034148*TiO 2 +0.004267*WO 3 +0.0034424*Y 2 O 3 +
0.0071109*Yb 2 O 3 +0.00096907*ZnO+0.0026412*ZrO 2   (VI)

and
where the density parameter P d is calculated according to formula (VII):
P d =−0.018843*Al 2 O 3 −0.020477*B 2 O 3 +0.021988*BaO+

0.074733*Bi 2 O 3 −0.00243*CaO+0.100258*Er 2 O 3 +

0.07427*Gd 2 O 3 −0.018568*K 2 O+0.06037*La 2 O 3 −0.0089*Li 2 O−0.00909*Na 2 O+0.00625*Nb 2 O 5 +0.068993*Nd 2 O 3 −0.038868*P 2 O 5 +0.04853*PbO−0.018196*SiO 2 +

0.013124*TeO 2−0.00529 *TiO 2 +0.044564*WO 3 +
0.022887*Y 2 O 3 +0.097857*Yb 2 O 3 +0.0077*ZnO+
0.012501*ZrO 2 +4.16819  (VII)

and
further wherein the glass has a transmittance index T i of 0.532 or greater, where the transmittance index T i 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”.

2. The glass of claim 1 , wherein the glass comprises B 2 O 3 from 9.0 mol % to 30.0 mol %.

3. The glass of claim 1 , wherein the glass comprises at least one of:
CaO from 0.0 mol % to 30.0 mol %;
BaO from 0.0 mol % to 10.0 mol %;
WO 3 from 0.0 mol % to 10.0 mol %;
Na 2 O from 0.0 mol % to 5.0 mol %;
K 2 O from 0.0 mol % to 5.0 mol %; and
SrO from 0.0 mol % to 7.5 mol %.

4. The glass of claim 1 , wherein the glass has a refractive index n d and a density d RT that satisfy formula (I)(a):
n d −(1.000+0.19* d RT )>0.000  (I)(a)

where the refractive index n d is measured at a wavelength of 587.56 nm and the density d RT is measured in g/cm 3 at 25° C.

5. The glass of claim 1 , wherein the transmittance index T i is 0.550 or greater.

6. The glass of claim 1 , wherein the glass is characterized by an ability to cool, in air, from 1100° C. to 500° C. for 2.5 minutes without crystallizing.

7. The glass of claim 1 , wherein the glass has a refractive index n d of 1.95 or greater, as measured at a wavelength of 587.56 nm, and a density d RT of 5.3 g/cm 3 or less, as measured at 25° C.

Assignees

• Corning Inc

Inventors

• Gaspar Marques Paulo Jorge
• Lepicard Antoine Marie Joseph
• Luo Jian
• Ma Lina
• Priven Alexander I

Classifications

• C03C3/068 Primary

  containing rare earths · CPC title

• C03C2201/3417

  Lanthanum · CPC title

• C03C2201/42

  containing titanium · CPC title

• C03C3/064

  containing boron · CPC title

• C03C3/072

  containing boron · CPC title