Color properties of transparent and heat-reflecting MgF2-coated indium-tin-oxide films.
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.
Hamberg
I
I
Chalmers University of Technology, Physics Department, S-412 96 Goteborg, Sweden.
Granqvist
C G
CG