The visual appearance of antireflection-coated transparent and heat-reflecting indium-tin-oxide (ITO) films on glass was studied by a colorimetric analysis in which the chromaticity coordinates for transmitted and reflected daylight were evaluated for various film thicknesses. A color purity of <1% in normal transmission and <10% in normal reflection could be achieved with ITO thicknesses in the 220–260- or 335–365-nm ranges and MgF2 thicknesses in the 90–105-nm range. These design criteria yield very efficient window coatings with high visual transmittance, low thermal emittance, and little or no perceived color.
© 1983 Optical Society of America
I. Hamberg and C. G. Granqvist, "Color properties of transparent and heat-reflecting MgF2-coated indium-tin-oxide films," Appl. Opt. 22, 609-614 (1983)