AuthorTopic: How ancient Egyptian blue emits near-infrared light & that could boost energy  (Read 409 times)

Offline azozeo

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 DNA India
Thu, 11 Oct 2018
A colour developed by Egyptians thousands of years ago can boost energy efficiency by cooling rooftops and walls, and could also enable solar generation of electricity via windows, scientists say. Egyptian blue, derived from calcium copper silicate, was routinely used on ancient depictions of gods and royalty, according to the study published in the Journal of Applied Physics. Previous studies have shown that when Egyptian blue absorbs visible light, it then emits light in the near-infrared range.

Now, a team led by researchers at the Lawrence Berkeley National Laboratory (Berkeley Lab) in the US has confirmed the pigmentís fluorescence can be 10 times stronger than previously thought. Measuring the temperature of surfaces coated in Egyptian blue and related compounds while they are exposed to sunlight, researchers found the fluorescent blues can emit nearly 100 per cent as many photons as they absorb.
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