The rotelle-shaped molecule - known as a "pi-conjugated spoked-wheel macrocycle" - acts the opposite of polarizing sunglasses, which screen out glare reflected off water and other surfaces and allow only direct sunlight to enter the eyes.
The new study showed wagon-wheel molecules emit light randomly in all directions - a necessary feature for a more efficient OLED, or organic LED. Existing OLEDs now in some smart phones and TVs use spaghetti-shaped polymers - chains of repeating molecular units - that emit only polarized light.
"This work shows it is possible to scramble the polarization of light from OLEDs and thereby build displays where light doesn't get trapped inside the OLED," says
"We made a molecule that is perfectly symmetrical, and that makes the light it generates perfectly random," he adds. "It can generate light more efficiently because it is scrambling the polarization. That holds promise for future OLEDs that would use less electricity and thus increase battery life for phones, and for OLED light bulbs that are more efficient and cheaper to operate."
Lupton emphasizes the study is basic science, and new OLEDs based on the rotelle-shaped molecules are "quite a way down the road."
He says OLEDs now are used in smart phones, particularly the Samsung Galaxy series; in pricey new super-thin TVs being introduced by
"OLEDs in smart phones have caught on because they are somewhat more efficient than conventional liquid-crystal displays like those used in the iPhone," he says. "That means longer battery life. Samsung has already demonstrated flexible, full-color OLED displays for future roll-up smart phones." Lupton says smart phones could produce light more efficiently using molecules that don't trap as much light.
The large rotelle-shaped molecules also can "catch" other molecules and thus would make effective biological sensors; they also have potential use in solar cells and switches, he adds.
The study was funded by the
Lupton is a research professor of physics and astronomy at the
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