The Waterloo Institute for Nanotechnology (WIN) has four main thematic research areas; Smart and Function Materials, Connected Devices, Next Generation Energy Systems and Therapeutics and Theranostics. To showcase the work going on within these areas, WIN will be holding Thematic Seminars featuring our members and their research group members.
This month's WIN Thematic Seminar will highight the Smart & Functional Materials theme with research presented by Atefeh Ghorbani and Professor Hany Aziz from the Electrical and Computer Engineering Department.
Refreshments will be provided! Registration required.
Quantum-dot Light Emitting Devices: Addressing the Electroluminescence Stability Challenge for a Bright Future
Abstract
Electroluminescent colloidal quantum dot (QD)-based light emitting devices (QLEDs) are poised to become the leading technology in next generation flat panel displays. Different from existing QD technology currently used in some TVs, QLEDs will be self-emissive, and therefore will enable superior colors and image qualities while consuming much less powers. Although QLEDs can have very high efficiencies, they tend to have limited electroluminescence (EL) stability; insufficient for many commercial applications. While progress in developing novel and better engineered QD materials sometimes leads to QLED stability improvements, the phenomena that limit the stability remain not well understood. This is especially true for blue-emitting QLEDs, one of the three necessary colors for full color displays.
In this seminar, QLED technology, its advantages over LCDs and OLEDs, and the limited EL stability issue will be introduced. Some results from our work on elucidating the root causes of the limited EL stability in these devices and strategies to enhance it will be highlighted. Some recent findings related to degradation processes in blue QLEDs will also be presented. An outlook on other research frontiers in this emerging field will also be outlined.
Biography
Atefeh Ghorbani is a Ph.D. candidate in Electrical Engineering (Nano) at University of Waterloo. She received her B.Sc in Electrical Engineering (Electronics) from Sharif University of Technology, Iran in 2016. She completed her master's degree in 2019 working on organic-inorganic Perovskite solar cells at Tarbiat Modares University, Iran. She is currently pursuing her Ph.D. degree conducting experimental research on blue Quantum Dot Light-Emitting Devices (QLEDs) degradation mechanisms and stability improvement approaches. Her research interests are fabrication and characterization of QLEDs, studying organic semiconductors material stabilities and fundamental phenomena (such as carrier injection and transport, carrier-exciton interactions) involved in QLEDs operation to improve the devices stability.
Hany Aziz is a Professor and University Research Chair in the Department of Electrical & Computer Engineering at the University of Waterloo and the Waterloo Institute for Nanotechnology (WIN). He conducts research in the area of organic and hybrid (organic/ inorganic) electronic and optoelectronic materials and devices, with a focus on material and device physics. His research spans a wide range of interests from studying molecular level electronic, excitonic and material aging processes and device failure mechanisms, to developing novel devices and fabrication technologies for next generation electronics. He has published more than 180 papers in this area and was awarded 57 US patents. He obtained his PhD in materials science and engineering from McMaster University, Canada in 1999. Prior to joining the University of Waterloo in 2007 he was a research scientist at Xerox Research Centre of Canada.
