Back to Search
Start Over
Exciton control enables high-performance colloidal quantum well light-emitting diodes.
- Source :
- Applied Physics Reviews; Jun2024, Vol. 11 Issue 2, p1-11, 11p
- Publication Year :
- 2024
-
Abstract
- Two-dimensional (2D) nanocrystals are promising for optoelectronic and microelectronic technologies. However, the performance of 2D nanocrystal light-emitting diodes (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. The formation of CQW films on charge transport layers shows an excellent photoluminescence quantum yield of 76.63%. An unreported relationship among Auger lifetime, electron confinement energy, and external quantum efficiency (EQE) in 2D nanocrystal devices is directly observed. The optimized CQW-LEDs possess a maximum power efficiency of 6.04 lm W<superscript>−1</superscript> and a current efficiency of 9.20 cd A<superscript>−1</superscript>, setting record efficiencies for 2D nanocrystal red LEDs. Additionally, a remarkable EQE of 13.43% has been achieved, accompanied by an exceptionally low efficiency roll-off. Significantly, EQE for flexible CQW-LEDs is 42-fold higher than the previous best results. Furthermore, active-matrix CQW-LEDs on printed circuit boards are developed. The findings not only unlock new possibilities for controlling exciton dynamics but also provide an alternative strategy to achieve high-performance 2D nanocrystal based applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19319401
- Volume :
- 11
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Applied Physics Reviews
- Publication Type :
- Academic Journal
- Accession number :
- 178180503
- Full Text :
- https://doi.org/10.1063/5.0206176