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The blue colour arises from the dual-purpose indium tin oxide anti-reflective coating, which also enhances emitter conduction. Solar cells are often coated with an anti-reflective coating. Materials that have been used include magnesium fluoride , silicon nitride , silicon dioxide , titanium dioxide , and aluminum oxide .
Another type is the high-reflector coating, which can be used to produce mirrors that reflect greater than 99.99% of the light that falls on them. More complex optical coatings exhibit high reflection over some range of wavelengths, and anti-reflection over another range, allowing the production of dichroic thin-film filters.
Thin films are used to create optical coatings. Examples include low emissivity panes of glass for houses and cars, anti-reflective coatings on glasses, reflective baffles on car headlights, and for high precision optical filters and mirrors. Another application of these coatings is spatial filtering. [2]
The blue colour arises from the dual-purpose Indium tin oxide anti-reflective coating, which also enhances emitter conduction. A SEM image depicting the pyramids and antireflection coating of a heterojunction solar cell
An anti-reflection coating eliminates reflected light and maximizes transmitted light in an optical system. A film is designed such that reflected light produces destructive interference and transmitted light produces constructive interference for a given wavelength of light.
Other functions of coatings include: Anti-fouling coatings [39] [40] [41]; Anti-microbial coatings. [42]Anti-reflective coatings for example on spectacles. [43]Coatings that alter or have magnetic, electrical or electronic properties.
Anti-reflective coating, used to reduce lens flare and produces the red and green colors common in lens flare. Bokeh, a source of circles around out-of-focus bright points, also due in part to the internals of the lens. Diffraction spike, a type of lens flare seen in some telescopes
Substrates that are transparent to the emitted wavelength, and backed by a reflective layer, increase the LED efficiency. The refractive index of the package material should also match the index of the semiconductor, to minimize back-reflection. An anti-reflection coating may be added as well. Also, surface roughening of LEDs is one of the key ...
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