It is known that the wall-plug efficiency (WPE) of a light-emitting diode (LED) can exceed unity and that electroluminescence cooling (ELC) happens in this scenario. However, it is difficult to observe the associated temperature drop due to the relatively small cooling power and the overwhelming heat flux from the ambient. In this work, we design a photonic crystal (PhC) enhanced LED which has smaller surface area as well as thermal mass compared with an encapsulated LED. We also present thermal models to evaluate the temperature drop of the LED in air and vacuum.
Zheng Li, Jin Xue, and Rajeev Ram, "A design of a PhC-enhanced LED for electroluminescence cooling," Proc. SPIE 10121, Optical and Electronic Cooling of Solids II, 1012108 (Presented at SPIE OPTO: February 02, 2017; Published: 17 February 2017); https://doi.org/10.1117/12.2253403.
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