solid-state lighting

Fabrication and Characterization of GaN-Based Superluminescent Diode for Solid-State Lighting and Visible Light Communication

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KAUST

This dissertation is devoted to the fabrication and electrical and optical characterization of a new class of III-nitride light-emitter known as superluminescent diode (SLD). SLD works in an amplified spontaneous emission (ASE) regime, and it combines several advantages from both LD and LED, such as droop-free, speckle-free, low-spatial coherence, broader emission, high-optical power, and directional beam. Here, SLDs were fabricated by a focused ion beam by tilting the front facet of the waveguide to suppress the lasing mode. They showed a high-power of 474 mW on c-plane GaN-substrate with a large spectral bandwidth of 6.5 nm at an optical power of 105 mW. To generate SLD-based white light, a YAG-phosphor-plate was integrated, and a CRI of 85.1 and CCT of 3392 K were measured. For the VLC link, SLD showed record high-data rates of 1.45 Gbps and 3.4 Gbps by OOK and DMT modulation schemes, respectively. Additionally, a widely single- and dual-wavelength tunability were designed using SLD-based external cavity (SLD-EC) configuration for a tunable blue laser source.

Yujian Guo

Yujian Guo is a Ph.D. student at Photonics Laboratory under the supervision of Professor Boon Ooi at King Abdullah University of Science and Technology (KAUST). Yujian obtained a Bachelor's Degree with distinction in Microelectronic engineering at the University of Electronic Science and Technology of China (UESTC), in 2017. He joined King Abdullah University of Science and Technology (KAUST) in the Fall of 2017 and achieved M.sc. in Electrical Engineering at KAUST in 2018. Research Interests Yujian's research interests include Underwater wireless optical communications, Underwater optical

Jian Wei Liang

Jian-Wei Liang has joined the Ph.D. program in Electrical Engineering at Photonics Lab at King Abdullah University of Science and Technology (KAUST) in fall 2016. He graduated from the chemistry department at National Cheng Kung University (NCKU), Taiwan in 2013 and then received his master's degree in chemistry from NCKU in 2015. In the duration of his master's education, he also worked as a teaching assistant in a basic chemistry experiment course. At present, he is concentrating on new material for UV LEDs in Photonics Lab under the supervision of Prof. Ooi. Research Interests Jian-Wei's

Abdullah A. Alatawi

Abdullah Alatawi is a Ph.D. student at Photonics Laboratory at King Abdullah University of Science and Technology (KAUST). His research interests include the study of semiconductor lasers, LEDs, and SLDs for applications in energy-efficient lighting and visible light communications. He received his master of science in optical nanotechnology engineering from the University of Kassel in Germany (2014). The topic of his thesis covers the investigation and improvement of VCSEL devices. He received his B.SC in Aerospace Engineering from King Fahad University of Petroleum and Minerals (KFUPM) in