Energy Transfer from Colloidal Nanocrystals into Si Substrates Studied via Photoluminescence Photon Counts and Decay Kinetics

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Energy Transfer from Colloidal Nanocrystals into Si Substrates Studied via Photoluminescence Photon Counts and Decay Kinetics

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Title: Energy Transfer from Colloidal Nanocrystals into Si Substrates Studied via Photoluminescence Photon Counts and Decay Kinetics
Author(s):
Nguyen, H. M. (UT Dallas);
Seitz, Oliver (UT Dallas);
Gartstein, Yuri N. (UT Dallas);
Chabal, Yves J. (UT Dallas);
Malko, Anton V. (UT Dallas)
Item Type: Article
Keywords: Time-resolved spectroscopy
Photoluminescence
Energy transfer
Colloidal nanocrystals
Abstract: We use time-resolved photoluminescence (PL) kinetics and PL intensity measurements to study the decay of photoexcitations in colloidal CdSe/ZnS nanocrystals grafted on SiO₂ - Si substrates with a wide range of the SiO₂ spacer layer thicknesses. The salient features of experimental observations are found to be in good agreement with theoretical expectations within the framework of modification of spontaneous decay of electric-dipole excitons by their environment. Analysis of the experimental data reveals that energy transfer (ET) from nanocrystals into Si is a major enabler of substantial variations in decay rates, where we quantitatively distinguish contributions from nonradiative and radiative ET channels. We demonstrate that time-resolved PL kinetics provides a more direct assessment of ET, while PL intensity measurements are also affected by the specifics of the generation and emission processes.
ISSN: 0740-3224
Persistent Link: http://hdl.handle.net/10735.1/3900
http://dx.doi.org/10.1364/JOSAB.30.002401
Sponsors: NSF (DMR-1207123), NSF (CHE-091197) and the Texas Higher Education Coordinating Board NHARP programs.

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