Visibly transparent broadband infrared mirror films having fluoropolymers and 7:1:1:7:1:1 layer thickness ratio

A multilayer infrared (IR) reflecting film comprising:

• an optical repeating unit comprising a plurality of polymeric layers arranged to reflect light by constructive and destructive interference, the plurality of optical polymeric layers including optical layers A and B, the optical layer A being a high refractive index polymeric layer, and the optical layer B being a low refractive index isotropic polymeric layer comprising one or more fluoropolymers comprising tetrafluoroethylene (TFE) and hexafluoropropylene (HFP),
• wherein the plurality of polymeric layers of the optical repeating unit are arranged in an order ABABAB with the thickness ratio of about 7:1:1:7:1:1,
• wherein the film has an average reflectance from about 82% to about 100% in an entire near infrared wavelength range of about 850 nm to about 1850 nm,
• wherein the film has an average transmission from about 70% to about 90% in a visible light range, and
• wherein the optical layer A absorbs less than 1% light in an ultraviolet (UV) wavelength range of about 350 nm to about 400 nm.