Dr. Robin P. Hansen Profile

Dr. Robin P. Hansen

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Proceedings Article | 21 August 2020 Presentation

Absence of efficiency droop in fin Light Emitting Diodes (LEDs)

Babak Nikoobakht, Robin Hansen, Yuqin Zong, Amit Agrawal, Michael Shur

Proceedings Volume 11465, 114650P (2020) https://doi.org/10.1117/12.2569808

KEYWORDS: Light emitting diodes

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We introduce a novel fin LED architecture that eliminates “efficiency droop”. Efficiency droop, which is the decline in internal quantum efficiency with increasing current density, is one of the significant challenges facing wide bandgap LED. In this presentation, we present data on how nanofins as quasi one-dimensional nanoLEDs would operate at low and high injection current densities and how electron-hole recombination is influenced because of the shape and size of the recombination region. Results include temperature-dependent electroluminescence of fin LEDs as well as dependence of their total radiant flux (optical output power) on injected current. We show unique examples of droop-free operation of fin LEDs at extremely high injection current densities beyond 1 million A/cm2. A three-parameter model based on the radiative and nonradiative processes (ABC) including the SRH and Auger recombination is presented that provides insight on how the non-radiative Auger recombination proces

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