OPTICAL LOW INDEX ALUMINA FILM FOR LIGHTING APPLICATIONS

摘要

Optical interference multilayer coatings of alternating first layers and second layers are provided. The first layers comprise alumina and have a refractive index that is about 1.38 to about 1.55 at 550 nm, while the second layers having a higher refractive index than the first layers. The first layers may be formed via chemical vapor deposition from an alumina precursor. Lamps comprising a light source and a light-transmissive envelope having a surface and at least partially enclosing the light source are also provided. At least a portion of the surface of the light-transmissive envelope is provided with an optical interference multilayer coating. Methods of forming an optical interference multilayer coating are also provided via chemical vapor deposition from an alumina precursor.