UV photobleaching of glass having UV-induced colorization

Patent metadata

Field	Value
Publication number	US-9834473-B2
Application number	US-201514623998-A
Country	US
Kind code	B2
Filing date	Feb 17, 2015
Priority date	Feb 20, 2014
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A method of UV photobleaching a glass sample having UV-induced colorization is disclosed. The processed includes first irradiating the glass sample with colorizing UV radiation having a colorizing wavelength of λ C <300 nm to form the colorized glass, which has a pink hue. The method then includes irradiating the colorized glass with bleaching UV radiation having a bleaching wavelength of λ B , wherein 248 nm≦λ B ≦365 nm, to substantially remove the pink hue.

First claim

What is claimed is:

1. A method of processing a glass sample, comprising:
irradiating the glass sample with colorizing UV radiation having a colorizing wavelength of λ C <300 nm to form a colorized glass sample having a pink hue; and
irradiating the colorized glass sample with bleaching UV radiation having a bleaching wavelength of λ B , wherein 248 nm≦λ B ≦365 nm, to substantially remove the pink hue,
wherein the glass sample includes titanium in trace amounts T, wherein 20 ppm/mole≦T≦1000 ppm/mole.

2. The method according to claim 1 , wherein irradiating the glass sample with colorizing UV radiation occurs during a cleaning process.

3. The method according to claim 2 , wherein the cleaning process comprises a plasma process.

4. The method according to claim 1 , wherein irradiating the glass sample with the colorizing UV radiation occurs during a deposition process.

5. The method according to claim 4 , wherein the deposition process includes a sputtering process.

6. The method according to claim 1 , wherein the glass sample defines a glass sheet.

7. The method according to claim 1 , wherein the glass sample comprises aluminophosphosilicate glass.

8. The method according to claim 1 , wherein the bleaching UV radiation has a bleaching intensity I B in the range 5 mW/cm 2 to 100 mW/cm 2 .

9. A method of processing a glass sample, comprising:
irradiating the glass sample with colorizing UV radiation having a colorizing wavelength λ C <300 nm, thereby forming a colorized glass sample having a pink hue due to the formation of an amount of Ti +3 color centers in the glass sample; and
irradiating the colorized glass sample with bleaching UV radiation having a bleaching intensity I B and a bleaching wavelength of λ B , wherein 248 nm≦λ B ≦365 nm, and wherein the bleaching intensity I B is sufficient to substantially remove the pink hue by substantially reducing the amount of Ti +3 color centers in the glass sample,
wherein the Ti +3 color centers form from an amount T of titanium in the glass sample, wherein 20 ppm/mole≦T≦1000 ppm/mole.

10. The method according to claim 9 , wherein the bleaching intensity I B is in the range 5 mW/cm 2 to 100 mW/cm 2 .

11. The method according to claim 9 , wherein irradiating the colorized glass sample with bleaching UV radiation is performed for an exposure time tin the range 0.5 hr≦t≦5 hrs.

12. The method according to claim 9 , wherein irradiating the glass sample with the colorizing UV radiation includes performing either a plasma cleaning process or a sputtering deposition process.

13. The method according to claim 9 , wherein the glass sample comprises an aluminophosphosilicate glass.

14. The method according to claim 9 , wherein the glass sample defines a glass sheet.

Assignees

• Corning Inc

Inventors

• Bookbinder Dana Craig
• Borrelli Nicholas Francis
• Gross Timothy Michael

Classifications

• C03C17/002

  for flat glass, e.g. float glass · CPC title

• C03C23/002 Primary

  by ultraviolet light · CPC title

• C03C23/0075

  Cleaning of glass (specially adapted to plate glass B08B11/00) · CPC title

• C23C14/34

  Sputtering · CPC title

• C03C23/006

  by plasma or corona discharge · CPC title