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

Patent metadata

Field	Value
Publication number	US-2025083991-A1
Application number	US-202418962592-A
Country	US
Kind code	A1
Filing date	Nov 27, 2024
Priority date	Sep 10, 2020
Publication date	Mar 13, 2025
Grant date	—

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.

First claim

What is claimed is:

1 . A glass, comprising:
TiO 2 from 1.0 mol % to 40.0 mol %; B 2 O 3 from 1.0 mol % to 29.0 mol %; SiO 2 from 0.0 mol % to 32.0 mol %, wherein a sum of (SiO 2 +B 2 O 3 ) is 45.0 mol % or less; and at least one oxide selected from Nb 2 O 5 , ZrO 2 , La 2 O 3 , Li 2 O, Al 2 O 3 , BaO, Bi 2 O 3 , CaO, Er 2 O 3 , Gd 2 O 3 , Na 2 O, Nd 2 O 3 , P 2 O 5 , PbO, WO 3 , Y 2 O 3 , Yb 2 O 3 , and ZnO, subject to the proviso that:
La 2 O 3 is from 15.0 mol % to 30.0 mol %;
ZrO 2 is from 0.0 mol % to 7.8 mol %;
Nb 2 O 5 is from 0.0 mol % to 7.0 mol %;
CaO is from 0.0 mol % to 15.0 mol %;
BaO is from 0.0 mol % to 15.0 mol %;
Li 2 O is from 0.0 mol % to 3.5 mol %;
GeO 2 is from 0.0 mol % to 10.0 mol %;
Al 2 O 3 is from 0.0 mol % to 10.0 mol %;
fluorine is from 0.0 atomic % to 1.0 atomic %;
a sum of (Y 2 O 3 +ZnO) is from 0.0 mol % to 2.0 mol %;
a total content of divalent metal oxides (RO) is from 0.0 mol % to 40.0 mol %; and
a total content of monovalent metal oxides (R 2 O) is from 0.0 mol % to 15.0 mol %;
wherein the glass has a transmittance index T i of from 0.25 to 0.75 and wherein the glass has a refraction parameter P ref and a transmittance index T i that satisfy formula (XII):

P
ref

-

(

0
.
2

⁢
6
⁢
2

-

0.115
*

T
i

)

>
0.

(
XII
)

where the refraction parameter P ref is calculated according to formula (VIII):

P
ref

=

0.2
1
⁢
6
⁢
5
⁢
6

+

0
.
0

⁢
0018225
*

B
2

⁢

O
3

-

0.0010873
*
BaO

-

0.0024853
*

Bi
2

⁢

O
3

-

0
.
0

⁢
030326
*

Er
2

⁢

O
3

-

0
.
0

⁢
018856
*

Gd
2

⁢

O
3

-

0.0017563
*

La
2

⁢

O
3

-

0
.
0

⁢
002505
*

Na
2

⁢
O

+

0.0017526
*

Nb
2

⁢

O
5

-

0.0025472
*

Nd
2

⁢

O
3

-

0.0016439
*
PbO

+

0.000050096
*

SiO
2

+

0.0011794
*

TiO
2

-

0.00072112

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