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Issue 7, 2016
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Dual emission in asymmetric “giant” PbS/CdS/CdS core/shell/shell quantum dots

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Abstract

Semiconducting nanocrystals optically active in the infrared region of the electromagnetic spectrum enable exciting avenues in fundamental research and novel applications compatible with the infrared transparency windows of biosystems such as chemical and biological optical sensing, including nanoscale thermometry. In this context, quantum dots (QDs) with double color emission may represent ultra-accurate and self-calibrating nanosystems. We present the synthesis of giant core/shell/shell asymmetric QDs having a PbS/CdS zinc blende (Zb)/CdS wurtzite (Wz) structure with double color emission close to the near-infrared (NIR) region. We show that the double emission depends on the excitation condition and analyze the electron–hole distribution responsible for the independent and simultaneous radiative exciton recombination in the PbS core and in the CdS Wz shell, respectively. These results highlight the importance of the driving force leading to preferential crystal growth in asymmetric QDs, and provide a pathway for the rational control of the synthesis of double color emitting giant QDs, leading to the effective exploitation of visible/NIR transparency windows.

Graphical abstract: Dual emission in asymmetric “giant” PbS/CdS/CdS core/shell/shell quantum dots

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Publication details

The article was received on 14 Dec 2015, accepted on 14 Jan 2016 and first published on 15 Jan 2016


Article type: Paper
DOI: 10.1039/C5NR08881J
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Citation: Nanoscale, 2016,8, 4217-4226
  • Open access: Creative Commons BY-NC license
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    Dual emission in asymmetric “giant” PbS/CdS/CdS core/shell/shell quantum dots

    H. Zhao, G. Sirigu, A. Parisini, A. Camellini, G. Nicotra, F. Rosei, V. Morandi, M. Zavelani-Rossi and A. Vomiero, Nanoscale, 2016, 8, 4217
    DOI: 10.1039/C5NR08881J

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