LEDs have inspired a new generation of electronics, but there is still work ahead if we want luminescent materials to consume less energy and have longer lifespans. Certain inorganic metals seem promising, but they are rare, expensive to process, and potentially toxic. Researchers now present an alternative: a group of metal-free phosphorescent molecules that efficiently and persistently glow different colors at room temperature and are potentially three times more efficient than a fluorescent organic LED.

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