Blue CdSe/CdS core/crown nanoplatelet light-emitting diodes obtained <i>via</i> a design-of-experiments approach
Obtaining efficient blue emission from CdSe nanoplatelets (NPLs) remains challenging due to charge trapping and sub-bandgap emission. Thanks to a design-of-experiments (DoE) approach, we significantly improved the NPL synthesis, obtaining precise control over the lateral aspect ratio (length/width). We raised the photoluminescence quantum efficiency up to 66% after growth of a CdS crown, with complete elimination of trap-state emission. Using these 3.5 monolayer, blue-emitting CdSe/CdS core/crown NPLs (<i>λ</i> = 460 nm), we fabricated light-emitting diodes (LEDs) with narrowband (16 nm) blue electroluminescence, an external quantum efficiency of 1.3% and low turn-on voltage of 2.9 V after DoE optimization. Our findings show that NPLs are a promising system to obtain LEDs that emit a saturated blue color.
Authors
- Iwan Moreels (ORCID: https://orcid.org/0000-0003-3998-7618)
- Emanuele Farinini (ORCID: https://orcid.org/0000-0003-4356-9371)
- Hossein Roshan (ORCID: https://orcid.org/0000-0001-7163-8501)
- Alessio Di Giacomo (ORCID: https://orcid.org/0000-0002-5095-5900)
- Sergio Fiorito (ORCID: https://orcid.org/0000-0003-2249-1798)
- Matilde Cirignano (ORCID: https://orcid.org/0000-0001-5939-062X)
- Francesco Di Stasio (ORCID: https://orcid.org/0000-0002-2079-3322)
- Davide Piccinotti (ORCID: https://orcid.org/0000-0002-2358-6417)
- Sirous Khabbazabkenar
Institutions
- Italian Institute of Technology (IT)
- Ghent University (BE)
- University of Genoa (IT)
Publication Details
- Journal
- Nanoscale
- Published
- 2024-11-13
- DOI
- https://doi.org/10.1039/d4nr03461a
- Citations
- 5
- Primary Topic
- Quantum Dots Synthesis And Properties
- Type
- article
- Field-Weighted Citation Impact
- 0.59
Funders
- European Commission
- Universiteit Gent
- Ministero dell'Università e della Ricerca
- Bijzonder Onderzoeksfonds UGent
- H2020 European Research Council
- H2020 Marie Skłodowska-Curie Actions