期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 11, 期 9, 页码 3473-3480出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c00958
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资金
- National Institutes of Health [1S10RR23057]
- CNSI at UCLA
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0019245]
- National Science Foundation [1905242]
- Faculty Career Development Award from the UCLA office of Equity, Diversity and Inclusion
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1905242] Funding Source: National Science Foundation
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 (QY > 30%) 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.
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