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How scientists cooked up a pasta-shaped molecule for your smartphone

A polymer shaped like wagon-wheel pasta can emit light in all directions, significantly reducing the amount of light wasted in LEDs, the authors of a new paper say.

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A proposed shape for the polymer used in organic LEDs takes its cues from wagon-wheel pasta, as opposed to the spaghetti-like design of the polymers used in current LEDs.

Stefan Jester/University of Bonn/University of Utah

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Spaghetti or rotelle?

This is not a culinary question – it’s a materials science one, and answering it could bolster the battery life of future smartphones.

Right now, organic LEDs are made with repeated molecular units that look like a spaghetti noodle. The linear shape means that light can move in just one direction, allowing just 20 percent of the light to escape the LED and leaving the other 80 percent trapped inside.

And LEDs can do better, according to a new paper published in Nature Chemistry on Sunday that describes a round organic molecule that could make LEDs, already at the forefront of energy efficient, high-tech lighting, even more efficient.

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The new shape for the cooked-up molecule still takes its cues from pasta. But, instead of spaghetti, this time it’s rotelle, also known as wagon-wheel pasta. This six nanometer wide, spoke-wheeled molecule can emit light in all directions, significantly reducing the amount of light wasted in LEDs, the authors say.

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