Irreversible Thermodynamic Bound for the Efficiency of Light-Emitting Diodes
Name
PhysRevApplied.8.014017.pdf
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484.71 KB
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Adobe PDF
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Author(s)
Xue, Jin
Li, Zheng
Ram, Rajeev J
Date Issued
July 2017
Journal
Physical Review Applied
Publisher
American Physical Society
Citation
Xue, Jin; Li, Zheng and Ram, Rajeev J. "Irreversible Thermodynamic Bound for the Efficiency of Light-Emitting Diodes." Physical Review Applied 8, 1 (July 2017): 014017 © 2017 American Physical Society
Version
Final published version
Abstract
A thermodynamic model for light-emitting diodes (LEDs) is developed by considering energy and entropy flows in the system. Thermodynamic constraints have previously been considered separately for the reversible process of electroluminescence in LEDs and for light extraction and collimation in other optical systems. By considering both processes in the LED model, an irreversible upper bound for the conversion of electrical energy to optical energy is derived and shown to be higher than unity, but tighter and more realistic than the reversible case. We also model a LED as an endoreversible heat engine where the carrier-transport processes can be directly connected to the elements of a thermodynamic cycle.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevApplied.8.014017
