Band Edge Excitons and Amplified Spontaneous Emission of Mercury Chalcogenide Nanoplatelets

Diroll, Benjamin T.; Dabard, Corentin; Lhuillier, Emmanuel; Ithurria, Sandrine

doi:10.1002/adom.202302004

Band Edge Excitons and Amplified Spontaneous Emission of Mercury Chalcogenide Nanoplatelets

Journal Article · Wed Dec 27 00:00:00 EST 2023 · Advanced Optical Materials

DOI:https://doi.org/10.1002/adom.202302004· OSTI ID:2263517

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Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)
Ecole Superieure de Physique et de Chimie Industrielles (ESPCI), Paris (France)
Sorbonne Univ., Paris (France)

Colloidal nanoplatelets of HgSe and HgTe prepared indirectly through cation exchange reactions can transfer many of the advantageous properties of atomically precise, 2D cadmium chalcogenides to the near-infrared (NIR) spectral window. In this work, HgSe and HgTe nanoplatelets are studied to understand their fundamental photophysical properties, particularly those areas of similarity and difference from cadmium-based NPLs, and to examine their potential as optical gain media. Similar to cadmium chalcogenide NPLs, low-temperature photoluminescence of HgTe NPLs displays two-color emission that depends on temperature, sample, fluence, excitation frequency, and irradiation time. Both HgTe and HgSe show nanosecond emission dynamics at temperatures as low as 2.5 K, with no indication that bright-dark excitonic splitting governs the low-temperature photoluminescence. Collectively, experimental data is most consistent with emission from a negative trion state at low temperature. Although the mercury chalcogenide nanoplatelets are shown to have broadened optical resonances compared to the cadmium chalcogenides from which they are derived, they retain slow Auger recombination and can display low-threshold amplified spontaneous emission in the NIR spectral window. Optical pumping thresholds for HgTe NPLs are observed as low as 4.4 µJ cm^-2 and highlight the potential 2D nanoplatelets as gain medium in the near-infrared.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: European Research Council (ERC); USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2263517

Alternate ID(s):: OSTI ID: 2263519
OSTI ID: 2511242

Journal Information:: Advanced Optical Materials, Journal Name: Advanced Optical Materials Journal Issue: 9 Vol. 12; ISSN 2195-1071

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Band Edge Excitons and Amplified Spontaneous Emission of Mercury Chalcogenide Nanoplatelets

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