Will Silicon Light Illuminate the Future?

In nano on October 7, 2006 at 1:18 am

Friday, October 06, 2006 By Tyler Hamilton
A startup says it can make silicon-based lighting that will compete with conventional incandescent bulbs and existing LED-based lighting.Researchers at a Canadian startup say they’ve found a way to make low-cost, white-light LEDs that could one day end our addiction to inefficient incandescent bulbs. They claim to have cracked the cost barrier for solid-state lighting by replacing the expensive semiconductors compounds traditionally used in LEDs with low-cost silicon.

“Because it’s a silicon-based system, we think [the lighting] will be affordable,” says Stephen Naor, chief executive officer of Ottawa-based Group IV Semiconductor (named after silicon’s position in the periodic table). …..
Group IV fabricated a structure in which an electrical current is passed between the top transparent layer of the device and a substrate made of silicon. In-between these two layers is a layer of silicon nanocrystals–quantum dots–that emits the light. When current is applied, the nanocrystal’s electrons are energized; once they settle back into their natural state, energy is given off in the form of photons, producing light. full article

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