
Proceedings Paper
Exciton and multi-exciton dynamics in CdSe/Cd1-xZnxS quantum dotsFormat | Member Price | Non-Member Price |
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Paper Abstract
The outstanding optical properties of Semiconductor Quantum Dots (QDs) have attracted much interest for over two
decades. The development of synthetic methods for the production of core-shell QDs has opened the way to attaining
almost ideal emitting properties. Their implementation in opto-electronic devices, such as light emitting diodes (LEDs)
and lasers, requires a full understanding of the fine details of their photophysics. The exciton dynamics of core and coreshell
QDs was extensively studied by means of pump and probe (P and P) and transient photoluminescence (TRPL)
spectroscopies. Nevertheless, the wealth of possible exciton and multi-exciton decay mechanisms, operating on
comparable time-scales, results in complex signals. In this work, the exciton dynamics of a complete CdSe/Cd1-xZnxS
series is investigated, with a focus on exciton trapping processes. Insights into the energy distribution of exciton traps are
unveiled by wavelength resolve QY measurements. Multicolor P and P measurements give a deeper insight into the
dynamics of exciton trapping and Auger recombinations. An inversion method is proposed as a powerful tool for
separating different contribution in complex P and P transients. The outcomes of this work clarify the role of core/shell
interfaces and surfaces in modulating the optical properties and suggest possible routes for their improvement.
Paper Details
Date Published: 19 April 2016
PDF: 11 pages
Proc. SPIE 9884, Nanophotonics VI, 988421 (19 April 2016); doi: 10.1117/12.2224947
Published in SPIE Proceedings Vol. 9884:
Nanophotonics VI
David L. Andrews; Jean-Michel Nunzi; Andreas Ostendorf, Editor(s)
PDF: 11 pages
Proc. SPIE 9884, Nanophotonics VI, 988421 (19 April 2016); doi: 10.1117/12.2224947
Show Author Affiliations
Renato Bozio, Univ. of Padova (Italy)
Published in SPIE Proceedings Vol. 9884:
Nanophotonics VI
David L. Andrews; Jean-Michel Nunzi; Andreas Ostendorf, Editor(s)
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