UV stable assemblies comprising multi-layer optical film
Assemblies comprising multi-layer optical film comprising optical layers reflecting incident UV and blue light over specified wavelength ranges. Embodiments of the multi-layer optical films are useful, for example, as a UV protective covering. An exemplary UV stable assembly comprises a multi-layer optical film comprising at least a first plurality of first and second optical layers reflecting at least 50 percent of incident UV light over at least a 30 nanometer wavelength range in a wavelength range from at least 300 nanometers to 400 nanometers, and a second plurality of first and second optical layers reflecting at least 50 percent of incident light over at least 30 nanometer wavelength in a wavelength range from at least 430 nanometers to 500 nanometers.
1. An assembly comprising:
a first multi-layer optical film comprised of at least 100 layers comprising at least first and second optical layers reflecting at least 50 percent of incident light over at least a 30 nanometer wavelength wide reflection band in a wavelength range from at least 430 nanometers to 500 nanometers, wherein the plurality of first and second optical layers is essentially free of 2,6 polyethylenenaphthalate; and
a second multi-layer optical film comprised of at least 100 layers, wherein at least one layer comprising 2,6 polyethylenenaphthalate.
2. The assembly of claim 1 , wherein the first multi-layer optical film comprising at least the first and second optical layers comprises an ultraviolet absorber.
3. The assembly of claim 1 , wherein the first optical layers of the first multi-layer optical film comprise polymethylmethacrylate, a blend of polymethylmethacrylate and poly(vinylidene fluoride), polycarbonate, polyethylene terephthalate, cyclic olefin copolymer, or thermoplastic polyurethane, and wherein the second optical layers of the multi-layer optical film comprise a copolymer of tetrafluorethylene, hexafluoropropylene, and vinylidene fluoride, polymethylmethacrylate, copolymers of polymethylmethacrylate, or a blend of poly(vinylidene fluoride) and polymethylmethacrylate.
4. A light emitting diode comprising the assembly of claim 1 .
5. A light guide comprising the assembly of claim 1 .
6. Sunglasses comprising the assembly of claim 1 .
7. A wavelength selective solar concentrating mirror comprising the assembly of claim 1 .
8. A broadband solar concentrating mirror comprising the assembly of claim 1 .
9. The assembly of claim 1 further comprising a reflective polarizer.