Hybrid interference coatings, lamps, and methods
AssigneeGeneral Electric Company
InventorsZhibo Zhao, Tianji Zhao, Rajasingh Schwartz Israel, Jiawei Li
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Abstract
Disclosed herein are optical interference multilayer coatings having region provided by a physical vapor deposition process and region provided by a chemical vapor deposition process. Also disclosed herein are methods of making such coatings, as well as lamps comprising a light-transmissive envelope, at least a portion of the surface of the light-transmissive envelope being provided with the optical interference multilayer coating noted above. Such coatings, when used on lamps, may advantageously offer improved energy efficiencies for such lamps.
Claims21
An article comprising an optical interference multilayer coating, said coating comprising,
- a first region comprising a first plurality of alternating first and second layers, said first layers having relatively low refractive index and said second layers having relatively higher refractive index than the first layers;
- and
- a second region comprising a second plurality of alternating third and fourth layers, said third layers having relatively low refractive index and said fourth layers having relatively higher refractive index than the third layers;
- wherein said first region is formed by a physical vapor deposition process, and said second region is formed by a chemical vapor deposition process.
A lamp comprising:
- a light-transmissive envelope having a surface;
- and a light source, said envelope at least partially enclosing said light source;
- wherein at least a portion of the surface of the light-transmissive envelope is provided with an optical interference multilayer coating comprising,
- (a) a first region comprising a first plurality of alternating first and second layers, said first layers having relatively low refractive index and said second layers having relatively higher refractive index than the first layers;
- and
- (b) a second region comprising a second plurality of alternating third and fourth layers, said third layers having relatively low refractive index and said fourth layers having relatively higher refractive index than the third layers;
- wherein said first region is formed by a chemical vapor deposition process, and said second region is formed by a physical vapor deposition process.
A method for making an article having an optical interference multilayer coating, said method comprising,
- providing a substrate,
- depositing by a physical vapor deposition process a first region comprising a first plurality of alternating first and second layers, said first layers having relatively low refractive index and said second layers having relatively higher refractive index than the first layers;
- depositing by a chemical vapor deposition process a second region comprising a second plurality of alternating third and fourth layers, said third layers having relatively low refractive index and said fourth layers having relatively higher refractive index than the third layers;
- wherein one of said first and second region is adjacent to the substrate.
An article comprising an optical interference multilayer coating, said coating comprising,
- a first region comprising a first plurality of alternating first and second layers, said first layers having relatively low refractive index and said second layers having relatively higher refractive index than the first layers;
- and
- a second region comprising a second plurality of alternating third and fourth layers, said third layers having relatively low refractive index and said fourth layers having relatively higher refractive index than the third layers;
- wherein said first region is formed by a physical vapor deposition process, and said second region is formed by a chemical vapor deposition process;
- and wherein the optical interference multilayer coating is configured to act to substantially transmit light in the visible spectrum region while substantially reflecting infrared light.
Dependencies are inferred from the claim text.