To combine two low-energy photons into one high-energy photon efficiently, the energy must be able to hop freely, but not too quickly, between randomly oriented molecules of a solid. The discovery ...

In low-energy bulbs an electric discharge passes through argon gas containing mercury, which generates UV light. This in turn activates the coating on the inside surface of the bulb, which shines ...

Smart LED lighting is the simplest way to keep your garden glowing through winter. They’re energy-efficient, weather-resistant, and far more flexible than the halogens and fairy lights of old.

Metasurfaces are two-dimensional (2D), nanoengineered surfaces that interact strongly with electromagnetic waves and can control light with remarkable precision. These ultra-thin layers can be used to ...