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Illumination & Displays

Low-energy LEDs could soon be lighting homes

Dr Faiz Rahman is putting millions of holes into light emitting diodes to make them brighter. He's not, as you might imagine, trying to increase their surface area. Instead, he's overcoming the physical properties that keep most light trapped inside. LEDs are very energy-efficient. But although 70% of the energy is converted to light, just 20% of that light escapes. A high refractive index at the LED-air interface means the light is reflected straight back inside.

Full story from The Guardian.