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Efficient Near-Infrared Light-Emitting Diodes Based on CdHgSe Nanoplatelets |
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| Authors: | Anatol Prudnikau Hossein Roshan Fabian Paulus Beatriz Martín-García René Hübner Houman Bahmani Jalali Manuela De Franco Mirko Prato Francesco Di Stasio Vladimir Lesnyak |
| Affiliation: | 1. Leibniz-Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany;2. Photonic Nanomaterials, Istituto Italiano di Tecnologia, Genova, 16163 Italy;3. Leibniz-Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany Center for Advancing Electronics Dresden (cfaed), Dresden University of Technology, Helmholtzstrasse 18, 01069 Dresden, Germany;4. CIC NanoGUNE BRTA, Tolosa Hiribidea 76, Donostia-San Sebastián, Basque Country, 20018 Spain IKERBASQUE, Basque Foundation for Science, Bilbao, Basque Country, 48009 Spain;5. Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany;6. Materials Characterization Facility, Istituto Italiano di Tecnologia, Via Morego 30, Genova, 16163 Italy;7. Physical Chemistry, Dresden University of Technology, Zellescher Weg 19, 01069 Dresden, Germany |
| Abstract: | Cadmium mercury selenide (CdHgSe) nanocrystals exhibit a unique combination of low-energy optical absorption and emission, which can be tuned from the visible to the infrared range through both quantum confinement and adjustment of their composition. Owing to this advantage, such nanocrystals have been studied as a promising narrow-band infrared light emitter. However, the electroluminescence of CdHgSe-based nanocrystals has remained largely unexplored, despite their potential for emitting light in the telecom wavelength range. Further benefits to their optical properties are expected from their shape control, in particular the formation of 2D nanocrystals, as well as from a proper design of their heterostructures. In this work, a colloidal synthesis of CdHgSe/ZnCdS core/shell nanoplatelets (NPLs) starting from CdSe template NPLs employing a cation exchange strategy is developed. The heterostructures synthesized exhibit photoluminescence that can be tuned from ≈1300 to 1500 nm. These near-infrared-active NPLs are employed in light-emitting diodes, demonstrating low turn-on voltage and high external quantum efficiency. |
| Keywords: | cadmium mercury selenide-based nanoplatelets colloidal semiconductor nanocrystals efficient light emitting diodes near infrared photoluminescence telecommunication windows |