Solarization resistant rare earth doped glasses

Patent metadata

Field	Value
Publication number	US-11286197-B2
Application number	US-201716474336-A
Country	US
Kind code	B2
Filing date	Dec 18, 2017
Priority date	Dec 29, 2016
Publication date	Mar 29, 2022
Grant date	Mar 29, 2022

Abstract

Substantially alkali free glasses are disclosed which can be used to produce substrates for flat panel display devices. The glasses can have a loading of fluorine and ceria to achieve exemplary solarization and UV protection attributes when exposed to UV radiation. Methods for producing substantially alkali free glasses using a float or downdraw process (e.g., a fusion downdraw process) are also disclosed.

First claim

What is claimed is:

1. A glass comprising fluoride and one or more rare earth metal oxides, wherein the fluoride has a content of at least 0.38 mol. % and the one or more rare earth metal oxides has a content of at least 0.42 mol. %, wherein the glass is alkali-free, and wherein the glass has a sharpness absorption greater than zero and an absorption cut off controllable between 300 nm and 450 nm.

2. The glass of claim 1 , wherein the sharpness absorption is Sharpness greater than 0.05 OD/mm/nm.

3. The glass of claim 1 , wherein the absorption cut off is less than 370 nm.

4. The glass of claim 1 , wherein the glass is capable of being exposed to UV radiation while still functioning as a glass.

5. The glass of claim 1 , wherein the glass is made from a fusion draw process or float process.

6. A glass comprising, in weight percent on an oxide basis in the ranges:
SiO 2 45-65
Al 2 O 3 10-25
B 2 O 3 0-5
MgO 0-5
CaO 0-8
SrO 0-5
BaO 0-10,
wherein the glass further comprises fluoride having a content of at least 0.38 mol. % and one or more rare earth metal oxides including Ce 2 O 3 having a content of at least 0.42 mol. %, wherein the glass is alkali-free, and wherein the glass has a sharpness absorption greater than zero and an absorption cut off controllable between 300 nm and 450 nm.

7. The glass of claim 6 further comprising SnO or SnO 2 between 0 to 2 weight percent.

8. The glass of claim 6 further comprising Eu 2 O 3 between 0 to 5 weight percent.

9. The glass of claim 6 further comprising Sm 2 O 3 between 0 to 5 weight percent.

10. The glass of claim 6 , wherein the glass is capable of being exposed to UV radiation while still functioning as a glass.

11. The glass of claim 6 further comprising less than 1 weight percent Na 2 O, Fe 2 O 3 , SO 3 , SO 4 , and Ag.

12. An alkali-free glass comprising, in weight percent on an oxide basis in the ranges:
SiO 2 49-62
Al 2 O 3 16-20
B 2 O 3 1-2
MgO 2-3
CaO 3-5
SrO 1-2
BaO 6-8.5
Ce 2 O 3 >0 to 10
Sm 2 O 3 0-2.5
Eu 2 O 3 0-2.5,
wherein the glass further comprises fluoride having a content of at least 0.38 mol. %, wherein one or more rare earth metal oxides including Ce 2 O 3 , Sm 2 O 3 , and Eu 2 O 3 has a content of at least 0.42 mol. %, and wherein the glass has a sharpness absorption greater than zero and an absorption cut off controllable between 300 nm and 450 nm.

13. The glass of claim 12 further comprising SnO or SnO 2 between 0 to 2 weight percent.

14. The glass of claim 12 further comprising less than 1 weight percent Fe 2 O 3 , SO 3 , SO 4 , and Ag.

15. The glass of claim 12 , wherein the glass is capable of being exposed to UV radiation while still functioning as a glass.

16. A display device comprising the glass of claim 1 .

17. The glass of claim 1 , wherein the glass comprises in weight percent on an oxide basis in the ranges:
SiO 2 45-65
Al 2 O 3 10-25
B 2 O 3 0-5
MgO 0-5
CaO 0-8
SrO 0-5
BaO 0-10
Ce 2 O 3 up to 15.

18. The glass of claim 1 , wherein the fluoride has a content in a range from 1.92 mol. % to 19.2 mol. %.

19. The glass of claim 1 , wherein the one or more rare earth metal oxides are selected from the group consisting of Ce 2 O 3 , Eu 2 O 3 , Sm 2 O 3 , and combinations thereof.

20. The glass of claim 1 , wherein the one or more rare earth metal oxides include Ce 2 O 3 having a content in a range from 0.43 mol. % to 4.3 mol. % in the glass.

Assignees

• Corning Inc

Inventors

• Borrelli Nicholas Francis
• Schroeder Iii Joseph Francis
• Senaratne Wageesha

Classifications

• C03C3/095 Primary

  containing rare earths · CPC title

• C03C3/087

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• C03C4/0085

  for UV-transmitting glass · CPC title

• C03C3/083

  containing aluminium oxide or an iron compound · CPC title

• C03C2201/36

  containing rare earth metals and aluminium, e.g. Er-Al co-doped · CPC title