What is it about?
Two-dimensional (2D) nanocrystals are promising for optoelectronic and microelectronic technologies. However, the performance of 2D nanocrystal light-emitting diode (LEDs) remains limited. Here, exciton dynamics are rationally controlled by both shell engineering and device engineering, obtaining colloidal quantum well LEDs (CQW-LEDs) with superior performance. An unreported relationship among Auger lifetime, electron confinement energy, and external quantum efficiency (EQE) in 2D nanocrystal devices are directly observed. The optimized CQW-LEDs possess the maximum power efficiency of 6.04 lm W-1 and current efficiency of 9.20 cd A-1, setting record efficiencies for 2D nanocrystal red LEDs. Furthermore, active-matrix CQW-LEDs on printed circuit boards are developed.
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Why is it important?
Our findings open new possibilities to manipulate exciton dynamics and achieve high-performance 2D nanocrystal based devices for the next-generation display technologies and related integrated optoelectronics.
Perspectives
Writing this article was a great pleasure as it has co-authors with whom I have had long standing collaborations. This article also lead to optoelectronics and microelectronics groups contacting me and ultimately to a greater involvement in optoelectronics and microelectronics research.
Baiquan Liu
Sun Yat-Sen University
Read the Original
This page is a summary of: Exciton control enables high-performance colloidal quantum well light-emitting diodes, Applied Physics Reviews, June 2024, American Institute of Physics,
DOI: 10.1063/5.0206176.
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