# US 8,541,324 B2 · Pergallous alkaline earth selenogermanate glasses

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- Number: US 8,541,324 B2
- Document ID: US8541324B2
- Status: Granted
- Kind: B2
- Application number: 13/306,386
- Filed: 2011-11-29
- Published: 2012-05-31
- Granted: 2013-09-24
- Earliest claimed: 2010-11-30
- Assignees: Corning Incorporated
- Applicants: Bruce Gardiner Aitken; Stephen Charles Currie
- Inventors: Bruce Gardiner Aitken; Stephen Charles Currie
- Web page: https://patentgrep.com/patent/US8541324B2

## CPC

- C03C 3/321: {Chalcogenide glasses, e.g. containing S, Se, Te}
- C03C 4/10: for infrared transmitting glass
- C03C 4/12: for luminescent glass; for fluorescent glass
- 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

## Abstract

IR-transmitting alkaline earth selenogallo- and/or selenoindo-germanate glasses that are capable of hosting luminescent rare earth dopants. The relatively high Ga and/or In content of most compositions serves to eliminate the typical clustering tendency of rare earth dopants in chalcogenide glasses, resulting in improved luminescence.

## Claims

### Claim 1

A glass composition comprising in mole percent:
50 to 95 percent GeSe2;
greater than 25 to less than 49.5 percent Ga2Se3, In2Se3, or a combination thereof; and
0.5 to less than 25 percent RSe, wherein R is an alkaline earth metal.

### Claim 2 (depends on 1)

The glass composition according to claim 1, wherein (Ga and/or In)/R is greater than 1.

### Claim 3 (depends on 1)

The glass composition according to claim 1, comprising greater than 50 percent GeSe2.

### Claim 4 (depends on 1)

The glass composition according to claim 1, comprising greater than 55 percent GeSe2.

### Claim 5 (depends on 1)

The glass composition according to claim 1, comprising greater than 60 percent GeSe2.

### Claim 6 (depends on 1)

The glass composition according to claim 1, comprising greater than 65 percent GeSe2.

### Claim 7 (depends on 1)

The glass composition according to claim 1, comprising greater than 70 percent GeSe2.

### Claim 8 (depends on 1)

The glass composition according to claim 1, comprising more than one alkaline earth metal.

### Claim 9 (depends on 1)

The glass composition according to claim 1, wherein the alkaline earth metal is Ba, Sr, Ca, or combinations thereof.

### Claim 10 (depends on 1)

The glass composition according to claim 1, wherein the glass comprises Ga2Se3 and BaSe.

### Claim 11 (depends on 10)

The glass composition according to claim 10, wherein the Ga/Ba ratio is greater than 1.

### Claim 12 (depends on 1)

The glass composition according to claim 1, further comprising one or more rare earth dopants.

### Claim 13 (depends on 12)

The glass composition according to claim 12, comprising 0 to 10 mole percent of the rare earth dopants.

### Claim 14 (depends on 1)

The glass composition according to claim 1, wherein R is Ba.

### Claim 15 (depends on 1)

The glass according to claim 1, wherein the glass is transparent in the infra red spectrum.

### Claim 16 (depends on 1)

The glass composition according to claim 1, comprising
greater than 70 percent GeSe2;
greater than 25 percent Ga2Se3, In2Se3, or a combination thereof; and
less than 5 percent RSe, wherein R is an alkaline earth metal.

### Claim 17 (depends on 1)

The glass composition according to claim 1, comprising
greater than 70 percent GeSe2;
greater than 25 percent Ga2Se3; and
less than 5 percent BaSe.

### Claim 18 (depends on 1)

The glass composition according to claim 1, comprising
greater than 65 percent GeSe2;
greater than 25 percent Ga2Se3, In2Se3, or a combination thereof; and
less than 10 percent RSe, wherein R is an alkaline earth metal.

### Claim 19 (depends on 1)

The glass composition according to claim 1, comprising
greater than 65 percent GeSe2;
greater than 25 percent Ga2Se3; and
less than 10 percent BaSe.