Abstract
A heated semiconductor light-emitting diode at low forward bias voltage is shown to use electrical work to pump heat from the lattice to the photon field. Here the rates of both radiative and nonradiative recombination have contributions at linear order in . As a result the device’s wall-plug (i.e., power conversion) efficiency is inversely proportional to its output power and diverges as approaches zero. Experiments directly confirm for the first time that this behavior continues beyond the conventional limit of unity electrical-to-optical power conversion efficiency.
- Received 9 August 2011
DOI:https://doi.org/10.1103/PhysRevLett.108.097403
© 2012 American Physical Society
Synopsis
Optical Device is More Than 100% Efficient
Published 27 February 2012
Experiments demonstrate a semiconductor device that emits more power as light than it takes in electrically.
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