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Electronics 2018, 7(12), 360; https://doi.org/10.3390/electronics7120360

Measuring Thermally-Driven LED Emissions via Voltage Modulation near Zero Bias

1
ThermaWatts, LLC, Renton, WA 98057, USA
2
Department of Physics, Oregon State University, Corvallis, OR 97331, USA
*
Author to whom correspondence should be addressed.
Received: 16 October 2018 / Revised: 20 November 2018 / Accepted: 23 November 2018 / Published: 28 November 2018
(This article belongs to the Section Microelectronics and Optoelectronics)
Full-Text   |   PDF [3311 KB, uploaded 28 November 2018]   |  

Abstract

This study was launched to demonstrate that LEDs at zero bias show recombination photon emissions, and to check the models for the same. A method for measuring the light emission for a LED near zero bias is presented. A large reverse bias sufficient to suppress detectable emissions is assumed. The bias voltage between ‘large reverse’ and our target voltage is modulated, and the difference measured. The measured emissions found are consistent with the Shockley diode equation. The spectrum near zero bias can be measured and characterized. It shows LED behavior that is substantially different from other typical measurements, and suggests a violation of Kirchhoff’s Law. View Full-Text
Keywords: LED low bias photoemission; non-blackbody radiations; thermal photoemission LED low bias photoemission; non-blackbody radiations; thermal photoemission
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Orem, P.M.; Vogt, K.T.; Graham, M.W.; Orem, F.M. Measuring Thermally-Driven LED Emissions via Voltage Modulation near Zero Bias. Electronics 2018, 7, 360.

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