Wavelength filtering high temperature nanostructure

• US 20080272682A1
• Filed: 05/01/2007
• Published: 11/06/2008
• Est. Priority Date: 05/01/2007
• Status: Active Grant

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Aurongzeb, Deeder, Ellis, Philip
• Granted Patent: US 7,772,749 B2
• Time in Patent Office: Days
• US Class Current: 313/112
• CPC Class Codes: C03C 17/004 Coating the inside
• CPC Class Codes: C03C 17/225 Nitrides
• CPC Class Codes: C03C 17/23 Oxides C03C17/02 takes precedence
• CPC Class Codes: C03C 2217/23 Mixtures
• CPC Class Codes: C03C 2217/231 In2O3/SnO2
• CPC Class Codes: C03C 2217/24 Doped oxides
• CPC Class Codes: C03C 2217/281 Nitrides
• CPC Class Codes: C04B 35/115 Translucent or transparent products
• CPC Class Codes: C04B 41/009 characterised by the material treated
• CPC Class Codes: C04B 41/4529 applied from the gas phase
• CPC Class Codes: C04B 41/457 Non-superficial impregnation or infiltration of the substrate
• CPC Class Codes: C04B 41/5027 Oxide ceramics in general; Specific oxide ceramics not covered by C04B41/5029 - C04B41/5051
• CPC Class Codes: C04B 41/5031 Alumina
• CPC Class Codes: C04B 41/5049 Zinc or bismuth oxides
• CPC Class Codes: C04B 41/505 Tin oxide
• CPC Class Codes: C04B 41/87 Ceramics
• CPC Class Codes: H01J 61/35 provided with coatings on the walls thereof; Selection of materials for the coatings using coloured coatings H01J61/40; using luminescent coatings H01J61/42

Abstract

The invention relates to a discharge lamp having a thin film indium oxide coating on the interior lamp envelope surface that effectively reflects UV, near IR and microwave radiation while transmitting light in the visible spectrum, the lamp being a high temperature operating lamp.

Claims

1. A high temperature coating comprising indium tin oxide that reflects ultraviolet and microwave radiation.

2. The high temperature coating of claim 1 comprising In_1.8Sn_0.2O₃.

3. The high temperature coating of claim 1 wherein the coating exhibits a crystal size of up to about 20 nm upon deposition of the coating.

4. The high temperature coating of claim 3 wherein the coating exhibits a crystal size of up to about 50 nm after exposure to high temperature operating conditions.

5. A lamp comprising an envelope and a source of light energy enclosed therein, wherein the envelope bears a thin film coating that reflects UV and microwave light energy from the source of light energy back into the interior of the lamp and transmits visible light energy.

6. The thin film coating of claim 5 comprising at least up to about 45.0 atomic percent indium and up to about 31.0 atomic percent tin.

7. The thin film coating of claim 6 wherein the thin film further comprises at least one of up to about 42.0 atomic percent nitrogen, up to about 48.0 atomic percent silicon and about 85.0 atomic percent oxygen.

8. The lamp of claim 5 wherein the thin film coating is deposited in a single layer.

9. The lamp of claim 5 wherein the thin film coating is deposited in multiple layers.

10. The lamp of claim 5 wherein the thin film coating comprises 11.57% nitrogen, 55.02% oxygen, 17.72% silicon, 11.93% indium, and 0.76% tin, wherein all percentages are atomic percentages.

11. The lamp of claim 5 wherein the thin film coating comprises In_1.8Sn_0.2O₃.

12. The lamp of claim 5 wherein the envelope is ceramic

13. The lamp of claim 12 wherein the thin film coating comprises at least molybdenum, indium oxide, zinc oxide and aluminum.

14. The lamp of claim 9 wherein the multiple layers have the same composition.

15. The lamp of claim 9 wherein at least two of the multiple layers have different compositions.