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

Patent metadata

Field	Value
Publication number	US-12187644-B2
Application number	US-202418420979-A
Country	US
Kind code	B2
Filing date	Jan 24, 2024
Priority date	Sep 10, 2020
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

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:
SiO 2 from greater than or equal to 3.0 mol % and less than or equal to 25.0 mol %;
B 2 O 3 from 1.0 mol % or greater, wherein a sum of (SiO 2 +B 2 O 3 ) 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 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:
Gd 2 O 3 is from 0.0 mol % to 27.0 mol %;
CaO is from 0.0 mol % to 15.0 mol %;
Li 2 O is from 0.0 mol % to 7.0 mol %;
MgO is from 0.0 mol % to 5.0 mol %;
Y 2 O 3 is from 0.0 mol % to 1.5 mol %;
Ta 2 O 5 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 %;
Bi 2 O 3 is from 0.0 mol % to 20.0 mol %;
PbO is from 0.0 mol % to 1.0 mol %;
HfO 2 is from 0.0 mol % to 1.0 mol %;
TeO 2 is from 0.0 mol % to 5.0 mol %;
Nb 2 O 5 is from 0.0 mol % to 25.0 mol %;
TiO 2 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 (SiO 2 +B 2 O 3 +Alk 2 O+MgO+CaO+SrO+BaO+ZnO) is 69.0 mol % or less, where Alk 2 O is a total content of alkali metal oxides; and
a sum of (RE m O n +TiO 2 +Nb 2 O 5 +ZrO 2 +Bi 2 O 3 +WO 3 ) is 25.0 mol % or greater,

where RE m O n is a total content of rare earth metal oxides, and

wherein the glass has a refractive index parameter P n and a transmittance index T i that satisfy formula (XI)(a):
P n −(2.055−0.36* T i )>0.000  (XI)(a)

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+0.0060806*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 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

+

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”.

2. The glass of claim 1 , wherein the glass has a refractive index n d , as measured at a wavelength of 587.56 nm, and further wherein the glass satisfies formula (II)(a):
n d −(2.055−0.36* T i )≥0.000  (II)(a).

3. 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.

4. The glass of claim 1 , wherein the glass comprises at least one of:
TiO 2 from 0.3 mol % to 18.0 mol %;
ZrO 2 from 0.3 mol % to 10.0 mol %;
Nb 2 O 5 from 0.3 mol % to 15.0 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 %;
SrO from 0.0 mol % to 7.5 mol %; and
Li 2 O from 0.0 mol % to 4.0 mol %.

5. 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.

6. 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.

7. The glass of claim 1 , wherein the glass comprises:
SiO 2 from 3.0 mol % to 20.0 mol %; and
B 2 O 3 from 3.0 mol % to 25.0 mol %.

8. The glass of claim 1 , wherein the glass comprises:
SiO 2 from grea

Assignees

• Corning Inc

Inventors

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

Classifications

• C03C2201/42

  containing titanium · CPC title

• C03C2201/3417

  Lanthanum · CPC title

• C03C4/0085

  for UV-transmitting glass · CPC title

• C03C3/072

  containing boron · CPC title

• C03C3/064

  containing boron · CPC title