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Physics Chat

Surface Engineering of Quantum Dot Optoelectronic Devices for Smart Lighting Applications

Speaker: Shijie Zhan (BHou)
Date: Friday 26 March 2021
Time: 15:00
Venue: Zoom

Colloidal Quantum Dots (CQDs) are promising to be adopted in the next generation large-area optoelectronics. Due to the zero dimensional nature of CQDs, the properties of CQDs and their devices largely depend on surface characteristics, including passivation ligands and interface of CQDs with other materials in devices. In this work, surface engineering, including solvent washing, ligand exchange, and device interface control, was investigated to achieve better performance of QD hybrid phototransistors and QD light emitting diodes (QLEDs). By medium-polarity solvent treatment, lattice reconstruction of perovskite QDs can be induced, which enhance the ambient stability of the QD/oxide hybrid phototransistors. Besides, efficient Cd-free CuInZnS QLEDs were achieved through alkanedithiol ligand exchange, enabling nontoxic lighting with function of visible light communication. Furthermore, Cd-free full colour QLEDs were developed by inkjet printing, where the hole transport layer adopted double-layer structure and enabled high ink resistance surface and intermix-free device interface. Finally, based on the surface-engineered QD phototransistors and QLEDs, a detector embedded QLED lighting array was demonstrated to show the potential of future smart QD optoelectronic system

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