Identiﬁcation of Auger effect as the dominant mechanism for efficiency droop of LEDs

Jacques Peretti; Claude Weisbuch; Justin Iveland; Marco Piccardo; Lucio Martinelli; James S. Speck

doi:10.1117/12.2038698

27 February 2014 Identiﬁcation of Auger effect as the dominant mechanism for efficiency droop of LEDs

Jacques Peretti, Claude Weisbuch, Justin Iveland, Marco Piccardo, Lucio Martinelli, James S. Speck

Proceedings Volume 9003, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVIII; 90030Z (2014) https://doi.org/10.1117/12.2038698
Event: SPIE OPTO, 2014, San Francisco, California, United States

Abstract

We discuss the unambiguous detection of Auger electrons by electron emission (EE) spectroscopy from a cesiated InGaN/GaN light-emitting diode (LED) under electrical injection. Electron emission spectra were measured as a function of the current injected in the device. The appearance of high-energy electron peaks simultaneously with the droop in LED efficiency shows that hot carriers are being generated in the active region (InGaN quantum wells) by an Auger process. A linear correlation was measured between the high energy emitted electron current and the “droop current” - the missing component of the injected current for light emission. We conclude that the droop originates from the onset of Auger processes. We compare such a direct identification of the droop mechanism with other identifications, most of them indirect and based on the many-parameter modeling of the dependence of the external quantum efficiency on the carrier injection.

Citation Download Citation

Jacques Peretti, Claude Weisbuch, Justin Iveland, Marco Piccardo, Lucio Martinelli, and James S. Speck "Identiﬁcation of Auger effect as the dominant mechanism for efficiency droop of LEDs", Proc. SPIE 9003, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVIII, 90030Z (27 February 2014); https://doi.org/10.1117/12.2038698

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