An LED’s power conversion (wall-plug) efficiency varies inversely with its optical output power. Wall-plug efficiency can exceed 100% at low applied voltages and high temperatures. The laws of thermodynamics were not overruled. The "extra-power is provided by vibrations in the device’s crystal lattice due to the high environmental temperature. Image credit: Santhanam, et al. ©2012 American Physical Society
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An LED’s power conversion (wall-plug) efficiency varies inversely with its optical output power. Wall-plug efficiency can exceed 100% at low applied voltages and high temperatures. The laws of thermodynamics were not overruled. The "extra-power is provided by vibrations in the device’s crystal lattice due to the high environmental temperature. Image credit: Santhanam, et al. ©2012 American Physical Society
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