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.;
Seitz, Oliver;
Gartstein, Yuri N.;
Chabal, Yves J.;
Malko, Anton V.
Date Created: 2013-08-16
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
Source: Journal of the Optical Society of America B: Optical Physics
Link to Related Resource: http://dx.doi.org/10.1364/JOSAB.30.002401
Persistent Link: http://hdl.handle.net/10735.1/3900
Bibliographic Citation: Nguyen, H. M., O. Seitz, Yu N. Gartstein, Y. J. Chabal, et al. 2013. "Energy transfer from colloidal nanocrystals into Si substrates studied via photoluminescence photon counts and decay kinetics." Journal of the Optical Society of America B: Optical Physics 30(9): 2401-2408.
Terms of Use: ©2013 Optical Society of America
Sponsors: NSF (DMR-1207123), NSF (CHE-091197) and the Texas Higher Education Coordinating Board NHARP programs.

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