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Technology

The NUV reflective coating described in this invention is fabricated by alternately depositing nanoparticle layers made of high refractive index material (e.g., TiO2) and low refractive index material (e.g., SiO2) using an aqueous layer-by-layer (LbL) assembly scheme. The refractive index of each layer is a function of its nanoporosity and can, therefore, be tuned by varying assembly conditions.

A TiO2/SiO2 multilayer functions as a Bragg mirror which selectively reflects light at multiple bands depending on the relative thickness of its constituent layers. The location and width of these reflectance peaks can be tuned to suit specific applications. For the particular application of NUV-reflective coatings, secondary reflectance peaks in the visible wavelengths may alter the visible color of the coating. The effect of these secondary peaks can be mitigated by adding a half, high refractive index stack to the main stack, resulting in a NUV-reflective coating with minimal visible color interference.