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Piezo fibre makes better LEDs

Researchers ay Georgia Tech have significantly improved the efficiency of ultra-violet (390nm) thin-film GaN LEDs by adding a zinc oxide microwire to the junction. "The devices are believed to be the first LEDs whose performance has been enhanced by the creation of an electrical charge in a piezoelectric material," said the university. The potential created by applying mechanical strain to the wires acts as a local gate voltage which was used to tune the charge transport and enhance carrier injection in the LEDs, increasing the rate at which electrons and holes recombined to generate photons.

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