Thermoelectrically Pumped Light-Emitting Diodes Operating above Unity Efficiency
Author(s)Santhanam, Parthiban; Gray, Dodd J.; Ram, Rajeev J.
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A heated semiconductor light-emitting diode at low forward bias voltage V<kBT/q 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 V. As a result the device’s wall-plug (i.e., power conversion) efficiency is inversely proportional to its output power and diverges as V 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.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of Electronics
Physical Review Letters
American Physical Society
Santhanam, Parthiban, Dodd Gray, and Rajeev Ram. “Thermoelectrically Pumped Light-Emitting Diodes Operating Above Unity Efficiency.” Physical Review Letters 108.9 (2012). © 2012 American Physical Society
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