Upcoming Event: Tuesday May 1, 2018

The physics of high-efficiency GaN LEDs

Date: Tuesday, May 1, 2018

5:30pm: Networking/Light Dinner
6:30pm: Presentation
8:00pm: Adjourn


Building SC-12
3600 Juliette Lane
Santa Clara, CA 95054

(Location: Take Montague Expy. OR Great America Exit off US 101; click to see instructions)

In order for chapter officers to estimate head count for food, Registration required! Register:


The physics of high-efficiency GaN LEDs


Dr. Aurelien David, Soraa


Abstract: Significant Light-emitting diodes (LEDs) are becoming a ubiquitous technology, as they reach power-conversion efficiencies sufficient to displace most other light emitters. Although the basic concepts underlying LED efficiency have been known for decades, GaN-based LEDs present new challenges both from the standpoint of device physics and materials science. Recent progress in these fields has propelled GaN LEDs to world-record efficiencies exceeding 90%. In this talk, I will present research on these high-efficiency LEDs, and will discuss physical aspects of the three components driving their efficiency:
1) Light extraction, whose full understanding intertwines classical and wave optics;
2) Carrier injection, which is now reaching the theoretical limit of ideal injection and may enable the observation of electroluminescent cooling;
3) Internal quantum efficiency, including the competition between radiative and non-radiative recombinations, and the ongoing controversy on the nature of "efficiency droop".


Dr. Aurelien David:
Aurelien David is Chief Scientist at Soraa. After graduating with a PhD in Applied Physics from Ecole Polytechnique and UCSB in 2006, he joined the Advanced Laboratories of Philips Lumileds to work on high-power III-Nitride LEDs. In 2010 he joined Soraa, a startup co-founded by Nobel laureate Shuji Nakamura to develop LEDs based on bulk-GaN substrates. He has helped develop Soraa's core technology. He now leads the advanced R&D on LED emitters, and focuses his research on LED efficiency and color science.