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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 …
Royal Society of Chemistry
Publication date: 
1 Jan 2016

Haiguang Zhao, Gianluca Sirigu, Andrea Parisini, Andrea Camellini, Giuseppe Nicotra, Federico Rosei, Vittorio Morandi, Margherita Zavelani-Rossi, Alberto Vomiero

Biblio References: 
Volume: 8 Issue: 7 Pages: 4217-4226