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Proceedings Paper

Surface ligands affect photoinduced modulation of the quantum dots optical performance
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Paper Abstract

Changes of optical properties of the solutions of CdSe/ZnS quantum dots (QDs) covered with the trioctylphosphine oxide (TOPO) ligands under the pulsed ultraviolet (UV) laser irradiation are observed. The fluorescence quantum yield (QY) of QDs decreases by more than an order of magnitude when the radiation dose approaches 2 × 10-15 J per particle. This process is accompanied by a blue shift of both fluorescence and the first excitonic absorption peaks. The fluorescence quenching becomes less pronounced when the overall TOPO content in the solution is increased. When ТОРО ligands are replaced with n-hexadecylamine (HDA), QY and spectral properties are not changed at the same irradiation conditions. We assume that the above changes of the optical properties are associated with photooxidation of TOPO ligands by excited QD. Such process is less probable for the HDA ligand due to its different energy structure.

Paper Details

Date Published: 2 May 2014
PDF: 8 pages
Proc. SPIE 9126, Nanophotonics V, 91263N (2 May 2014); doi: 10.1117/12.2057828
Show Author Affiliations
Victor A. Krivenkov, National Research Nuclear Univ. MEPhI (Russian Federation)
Pavel S. Samokhvalov, National Research Nuclear Univ. MEPhI (Russian Federation)
Pavel A. Linkov, National Research Nuclear Univ. MEPhI (Russian Federation)
Daria O. Solovyeva, National Research Nuclear Univ. MEPhI (Russian Federation)
Gennadii E. Kotkovskii, National Research Nuclear Univ. MEPhI (Russian Federation)
Alexander A. Chistyakov, National Research Nuclear Univ. MEPhI (Russian Federation)
Igor Nabiev, National Research Nuclear Univ. MEPhI (Russian Federation)
Lab. de Recherche en Nanosciences, Univ. de Reims Champagne-Ardenne (France)


Published in SPIE Proceedings Vol. 9126:
Nanophotonics V
David L. Andrews; Jean-Michel Nunzi; Andreas Ostendorf, Editor(s)

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