# US 10,308,545 B2 · Highly refractive thin glasses

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- Number: US 10,308,545 B2
- Document ID: US10308545B2
- Status: Granted
- Kind: B2
- Application number: 14/799,188
- Filed: 2015-07-14
- Published: 2015-11-05
- Granted: 2019-06-04
- Earliest claimed: 2010-10-26
- Assignees: Schott AG
- Applicants: Schott AG
- Inventors: Silke Wolff; Simone Ritter; Gunther Paulus; Ute Wölfel; Peter Brix
- Web page: https://patentgrep.com/patent/US10308545B2

## CPC

- C03C 3/062: with less than 40% silica by weight
- C03C 3/064: containing boron
- C03C 3/066: containing zinc
- C03C 3/068: containing rare earths
- H10K 59/879: {comprising refractive means, e.g. lenses}
- H10K 77/10: Substrates, e.g. flexible substrates
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## 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.

## Claims

### Claim 1

A thin glass having a refractive index of higher than 1.60, comprising the following components in % by weight:
from
to
SiO2
15
37.5
BaO
15
40
TiO2
2
15
Nb2O5
0
7
La2O3
0
18
ZnO
0
9
Al2O3 + SrO
0
<2, and
a ratio by weight of BaO to TiO2 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.

### Claim 2 (depends on 1)

The thin glass according to claim 1, further comprising the following components in % by weight:
From
to
SiO2
15
37.5
B2O3
0
17
Na2O
0
5
K2O
0
10
MgO
0
5
CaO
0
10
SrO
0
<2
BaO
15
40
ZnO
0
9
TiO2
2
15
ZrO2
0
10
Nb2O5
0
7
La2O3
0
18
Ta2O5
0
7 and
GeO2
0
9.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

The thin glass according to claim 1, further comprising the following components in % by weight:
From
to
SiO2
30
37.5
BaO
21
38
TiO2
2
11
ZrO2
2
7.5 and
La2O3
5
15.

### Claim 5 (depends on 1)

The thin glass according to claim 1, wherein the content of Al2O3 of the thin glass is lower than 0.1% by weight.

### Claim 6 (depends on 1)

The thin glass according to claim 1, wherein the content of La2O3 is at least 3% by weight.

### Claim 7 (depends on 1)

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

### Claim 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
SiO2
15
37.5
BaO
15
40
TiO2
2
15
Nb2O5
0
7
La2O3
0
18
ZnO
0
9
Al2O3 + SrO
0
<2 and
a ratio by weight of BaO to TiO2 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.

### Claim 9 (depends on 8)

The layer composite according to claim 8, wherein the layer composite is an OLED.

### Claim 10

A method for the production of a thin glass having a refractive index of higher than 1.60, comprising the steps of:
melting of a glass mixture to form a glass melt or a glass obtained from the glass melt, the glass mixture comprising the following components in % by weight:
from
To
SiO2
15
37.5
BaO
15
40
TiO2
2
15
Nb2O5
0
7
La2O3
>5
18
ZnO
0
9
Al2O3 + SrO
0
<2 and
processing the glass melt or the glass obtained from the glass melt into the thin glass, 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.

### Claim 11 (depends on 1)

The thin glass according to claim 1, wherein the thin glass has a thickness of at most 0.8 mm.

### Claim 12 (depends on 1)

The thin glass according to claim 1, wherein the thin glass has a thickness of at most 0.6 mm.

### Claim 13 (depends on 8)

The layer composite according to claim 8, wherein the layer composite has a thickness of at most 0.8 mm.

### Claim 14 (depends on 8)

The layer composite according to claim 8, wherein the layer composite has a thickness of at most 0.6 mm.

### Claim 15 (depends on 1)

The thin glass according to claim 1, wherein the at least one fire-polished surface has a root-mean-squared roughness of at most 3 nanometers.

### Claim 16 (depends on 1)

The thin glass according to claim 1, wherein the at least one fire-polished surface has a root-mean-squared roughness of at most 1 nanometer.