Hugely-Efficient LEDs Now Use Quantum Dots


Quantum Dot white LED

Global warming and pollution are already impacting our lives. There are millions of deaths every year that are caused by them.

For that reason, researchers from all over the world are looking for ways to make everything around us more energy efficient and use renewable resources. By implementing these strategies, we can reduce energy usage and air pollution by multiple times.

One of the problems is electricity consumption for lighting. Most of today’s lambs are expensive or not that efficient.
The efficiency of a lamb is measured in lumens per watt. LEDs are definitely winners in this category.

However, in order to create white light with LEDs, a phosphor-based coating is added to blue LEDs. It is a very hard process since proper tuning of the color is very difficult. Therefore, lambs using this technology are more expensive and are not used widely.

Researchers from Koç University, Turkey, found a solution that will provide the effectiveness and brightness of conventional LEDs and will cost less.

They showed nanomaterial-based LEDs with a record luminous efficiency of 105 lumens per watt for this technology. They used regular blue LEDs combined with flexible lenses, filled with a solution of nano-sized semiconductor particles called quantum dots. The blue light from the LED causes the quantum dots to emit green and red, combining to create white light.

The difference of this quantum dots LED from any other LED of the same type is that the nanomaterial is incorporated in liquid form instead of solid. This allows achieving higher efficiency without a significant increase in cost.

Their LEDs can be further developed to reach an efficiency of 200 lumens per watt. Since synthesis and fabrication are easy and inexpensive, they could be produced massively. This will decrease the global electricity consumed for lighting by more than a half. It is equal to the electricity from 230 typical 500-megawatt coal plants and would reduce greenhouse gas emissions by 200 million tons.

[Via EurekAlert]

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