Improving the photoluminescence quantum yields of quantum dot films through a donor/acceptor system for near-IR LEDs
Royal Society of Chemistry
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Davis, N., Allardice, J., Xiao, Z., Karani, A., Jellicoe, T., Rao, a., & Greenham, N. (2019). Improving the photoluminescence quantum yields of quantum dot films through a donor/acceptor system for near-IR LEDs. Materials Horizons, 6 (1), 137-143. https://doi.org/10.1039/C8MH01122B
Near-infrared light-emitting diodes (LEDs) show potential for telecommunication and medical applications. Quantum dot nanocrystals (QDs), specifically lead chalcogenides, are candidate LED materials since they exhibit tuneable luminescence across the whole near-infrared region, but their surface structure must be carefully controlled to achieve efficient emission. We demonstrate an efficient donor–acceptor QD system by embedding low-energy QDs with high photoluminescence quantum efficiency (PLQE) into a matrix of higher-energy QDs with lower PLQE. We find that the overall PLQE of densely packed cross-linked QD films can be improved by the incorporation of a relatively small fraction of well-passivated acceptor QDs, also leading to improved LED performance. Excitations are transferred into the isolated low-energy acceptor QDs, where they recombine with high radiative efficiency.
7 Affordable and Clean Energy
Is supplemented by: https://doi.org/10.17863/CAM.30558.
N. J. L. K. D. acknowledges funding from the Ernest Oppenheimer fund. J. R. A. thanks the Cambridge Commonwealth European and International Trust, and Winton Programme for the Physics of Sustainability for financial support. J. X. thanks the EPSRC CDT in Nanoscience and Nanotechnology (EP/L015978/1). This work was supported by the EPSRC (EP/M005143/1 and EP/M024873/1).
Engineering and Physical Sciences Research Council (EP/M005143/1)
Engineering and Physical Sciences Research Council (EP/L01551X/1)
Engineering and Physical Sciences Research Council (EP/M006360/1)
Engineering and Physical Sciences Research Council (EP/M024873/1)
Engineering and Physical Sciences Research Council (EP/L015978/1)
Engineering and Physical Sciences Research Council (EP/P007767/1)
Engineering and Physical Sciences Research Council (EP/P027741/1)
External DOI: https://doi.org/10.1039/C8MH01122B
This record's URL: https://www.repository.cam.ac.uk/handle/1810/287980
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