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Reference Number EP/Y02771X/1
Title Elucidating a complete picture of exciton dynamics in operating quantum-dot light-emitting diodes
Status Started
Energy Categories Not Energy Related 95%;
Energy Efficiency (Industry) 5%;
Research Types Basic and strategic applied research 100%
Science and Technology Fields PHYSICAL SCIENCES AND MATHEMATICS (Chemistry) 40%;
PHYSICAL SCIENCES AND MATHEMATICS (Physics) 40%;
PHYSICAL SCIENCES AND MATHEMATICS (Metallurgy and Materials) 20%;
UKERC Cross Cutting Characterisation Not Cross-cutting 100%
Principal Investigator Dr A Rao
No email address given
Physics
University of Cambridge
Award Type Standard
Funding Source EPSRC
Start Date 01 October 2023
End Date 30 September 2025
Duration 24 months
Total Grant Value £187,096
Industrial Sectors
Region East of England
Programme UKRI MSCA
 
Investigators Principal Investigator Dr A Rao , Physics, University of Cambridge (100.000%)
Web Site
Objectives
Abstract Quantum-dot light-emitting diodes (QLEDs) are promising as energy-saving, color-pure, and flexible light sources for display, lighting, and communication techniques. At present, the performance of QLEDs is hindered by the efficiency roll-off at high currents and the device degradation in long-term operations. Further development of QLEDs demands an in-depth understanding of the fundamental processes in device operations. However, due to the lack of in-situ/operando characterization methods, the ultrafast charge and exciton dynamics in operating QLEDs is still not clear. Here, the project aims to go beyond the state-of-the-art methodologies, and create a set of ultrafast spectroscopic toolkits to elucidate a spatio-temporal resolved picture of exciton dynamics in operating QLEDs. I will realize a) operando time-resolved transient absorption (TA), b) operando spatio-temporal TA microscopy, and c) electrically-pumped time-resolved TA measurements on full stacks of QLEDs. I will gain quantitative insights into exciton dissociation, exciton diffusion, and electron injection dynamics. Finally, new mechanistic interpretations on the efficiency roll-off and degradation of QLEDs will be provided. The project covers the disciplines of optics, material science, and device physics, combining the host group's expertise in ultrafast spectroscopy, and the researcher's expertise in QLEDs. The fellow will acquire complementary skills and knowledge to reach professional maturity. The outcomes will increase the fundamental understanding of nanomaterials and LEDs, facilitating the optimization of QLEDs towards practical requirements. The project will yield a widely-applicable toolkit for various LEDs. Successful implementation of this project will promote the competitiveness of the host organization in the field of optoelectronics. In the long run, the potential commercialization of QLEDs is expected to reduce electricity consumption and promote sustainable development in Europe
Publications (none)
Final Report (none)
Added to Database 12/07/23