Mercury Chalcogenide Nanoplatelet–Quantum Dot Heterostructures as a New Class of Continuously Tunable Bright Shortwave Infrared Emitters
| Autor: | Justin R. Caram, Arundhati Deshmukh, Timothy L. Atallah, Ashley J. Shin, Victoria Vilchez, Sandrine Ithurria, Mikayla L. Sonnleitner, Chengye Huang, Stephanie M. Tenney, Hannah C. Friedman |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
business.industry Chalcogenide chemistry.chemical_element Heterojunction Shortwave infrared Mercury (element) chemistry.chemical_compound chemistry Quantum dot Optoelectronics Energy transformation General Materials Science Physical and Theoretical Chemistry business Nanoscopic scale |
| Zdroj: | The Journal of Physical Chemistry Letters. 11:3473-3480 |
| ISSN: | 1948-7185 |
| Popis: | Despite broad applications in imaging, energy conversion, and telecommunications, few nanoscale moieties emit light efficiently in the shortwave infrared (SWIR, 1000-2000 nm or 1.24-0.62 eV). We report quantum-confined mercury chalcogenide (HgX, where X = Se or Te) nanoplatelets (NPLs) can be induced to emit bright (QY30%) and tunable (900-1500+ nm) infrared emission from attached quantum dot (QD) "defect" states. We demonstrate near unity energy transfer from NPL to these QDs, which completely quench NPL emission and emit with a high QY through the SWIR. This QD defect emission is kinetically tunable, enabling controlled midgap emission from NPLs. Spectrally resolved photoluminescence demonstrates energy-dependent lifetimes, with radiative rates 10-20 times faster than those of their PbX analogues in the same spectral window. Coupled with their high quantum yield, midgap emission HgX dots on HgX NPLs provide a potential platform for novel optoelectronics in the SWIR. |
| Databáze: | OpenAIRE |
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