| Autor: |
Davis, Nathaniel, Allardice, JR, Xiao, Z, Karani, AH, Jellicoe, TC, Rao, akshay, Greenham, NC |
| Přispěvatelé: |
Allardice, Jesse [0000-0002-1969-7536], Xiao, James [0000-0002-1713-5599], Karani, Arfa [0000-0002-9038-1593], Rao, Akshay [0000-0003-0320-2962], Greenham, Neil [0000-0002-2155-2432], Apollo - University of Cambridge Repository |
| Rok vydání: |
2019 |
| Předmět: |
|
| DOI: |
10.17863/cam.35300 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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