Highly refractive thin glasses

Patent metadata

Field	Value
Publication number	US-10308545-B2
Application number	US-201514799188-A
Country	US
Kind code	B2
Filing date	Jul 14, 2015
Priority date	Oct 26, 2010
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

Glass sheets with high refractive indexes (nd), layer composite assemblies including the glass sheets, methods for manufacturing the glass sheets, and methods of using the glass sheets are all provided. The glass sheets can be processed in a glass sheet manufacturing process and nevertheless have the optical properties of a classical optical glass. The glass sheets of the are highly transparent, resistant to crystallization, chemically resistant and highly refractive. The glass sheets have a viscosity-temperature behavior that is adapted to the manufacturing procedure with glass sheet manufacturing processes.

First claim

What is claimed is:

1. A thin glass having a refractive index of higher than 1.60, comprising the following components in % by weight:

from
to

SiO 2
15
37.5

BaO
15
40

TiO 2
2
15

Nb 2 O 5
0
7

La 2 O 3
0
18

ZnO
0
9

Al 2 O 3 + SrO
0
<2, and

a ratio by weight of BaO to TiO 2 that is at least 1.5, wherein the thin glass has a thickness of lower than 2 mm and comprises at least one fire-polished surface having a root-mean-squared roughness of at most 5 nanometers, and wherein the amount of PbO in the thin glass is lower than 1000 ppm.

2. The thin glass according to claim 1 , further comprising the following components in % by weight:

From
to

SiO 2
15
37.5

B 2 O 3
0
17

Na 2 O
0
5

K 2 O
0
10

MgO
0
5

CaO
0
10

SrO
0
<2

BaO
15
40

ZnO
0
9

TiO 2
2
15

ZrO 2
0
10

Nb 2 O 5
0
7

La 2 O 3
0
18

Ta 2 O 5
0
7 and

GeO 2
0
9.

3. The thin glass according to claim 1 , further comprising a sum of the contents of BaO, SrO, CaO, MgO and ZnO that is at least 20% by weight.

4. The thin glass according to claim 1 , further comprising the following components in % by weight:

From
to

SiO 2
30
37.5

BaO
21
38

TiO 2
2
11

ZrO 2
2
7.5 and

La 2 O 3
5
15.

5. The thin glass according to claim 1 , wherein the content of Al 2 O 3 of the thin glass is lower than 0.1% by weight.

6. The thin glass according to claim 1 , wherein the content of La 2 O 3 is at least 3% by weight.

7. The thin glass according to claim 1 , wherein the thin glass is suitable for use a substrate or superstrate.

8. A layer composite comprising:
at least one semiconductor layer; and
a thin glass having a refractive index of higher than 1.60, the thin glass comprising the following components in % by weight:

From
To

SiO 2
15
37.5

BaO
15
40

TiO 2
2
15

Nb 2 O 5
0
7

La 2 O 3
0
18

Assignees

• Schott Ag

Inventors

• Wolff Silke
• Ritter Simone
• Paulus Gunther
• Wölfel Ute
• Brix Peter

Classifications

• C03C3/064

  containing boron · CPC title

• C03C3/062 Primary

  with less than 40% silica by weight · CPC title

• C03C3/068

  containing rare earths · CPC title

• H01L51/5275

  Electricity · mapped topic

• H01L51/0096

  Electricity · mapped topic