The increasing demand for wireless data communication and popularity of solid-state lighting has prompted research into visible-light communication (VLC) systems based on InGaN/GaN light-emitting diodes (LEDs). VLC is a promising candidate for next-generation (5G and beyond) network systems, especially for indoor applications. To support multi-Gb/s data rates, VLC systems will require efficient LEDs with large modulation bandwidths (high speed). Conventional lighting-class LEDs cannot achieve high-speed operation due to their large chip size, large active region volume, and phosphor-converted output. Conversely, micro-scale LEDs (micro-LEDs) offer a viable path to high-speed operation. In this talk, I will introduce VLC and discuss progress on the growth, fabrication, and characterization of high-speed micro-LEDs. I will compare the high-speed performance of micro-LEDs fabricated on several different crystal orientations of GaN, and present a modeling approach to extract fundamental LED properties using RF measurements.
Daniel Feezell is an Associate Professor in the Electrical and Computer Engineering Department and the Center for High Technology Materials (CHTM) at the University of New Mexico (UNM), and the Faculty Advisor to the CHTM Nanofabrication Facility. Dr. Feezell received the Ph.D. degree in 2005 from the University of California Santa Barbara (UCSB) for work on long-wavelength InP-based vertical-cavity surface-emitting lasers (VCSELs) with Professor Larry Coldren. Prior to joining UNM, he was a Project Scientist in the Solid-State Lighting and Energy Center at UCSB working with Professor Shuji Nakamura and a Senior Device Scientist and the first employee at Soraa, Inc. where he worked on III-nitride light-emitting diodes (LEDs) and diode lasers. His current research interests include epitaxial growth, fabrication, and characterization of III-nitride materials and devices, including nonpolar and semipolar orientations; solid-state lighting and high-efficiency and high-speed LEDs; nanoscale selective-area epitaxy; and edge-emitting and vertical-cavity surface-emitting lasers. In 2013, he received a Defense Advanced Research Projects Agency (DARPA) Young Faculty Award, with a Director’s Fellowship Extension in 2015. He also received a National Science Foundation Faculty Early Career Development (CAREER) Award in 2015. Dr. Feezell is a Senior Member of IEEE and the Sources Thrust Leader in the Smart Lighting Engineering Research Center (ERC). He has authored or co-authored over 100 journal and conference publications and holds more than 20 U.S. patents. Additional information can be found at http://www.feezellgroup.com.