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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 9 — Sep. 1, 2013
  • pp: 2401–2408

Energy transfer from colloidal nanocrystals into Si substrates studied via photoluminescence photon counts and decay kinetics

H. M. Nguyen, O. Seitz, Yu. N. Gartstein, Y. J. Chabal, and A. V. Malko  »View Author Affiliations


JOSA B, Vol. 30, Issue 9, pp. 2401-2408 (2013)
http://dx.doi.org/10.1364/JOSAB.30.002401


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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 SiO2Si 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.

© 2013 Optical Society of America

OCIS Codes
(160.4760) Materials : Optical properties
(250.5230) Optoelectronics : Photoluminescence
(260.2160) Physical optics : Energy transfer
(300.6500) Spectroscopy : Spectroscopy, time-resolved

ToC Category:
Optoelectronics

History
Original Manuscript: June 3, 2013
Manuscript Accepted: July 26, 2013
Published: August 16, 2013

Citation
H. M. Nguyen, O. Seitz, Yu. N. Gartstein, Y. J. Chabal, and A. V. Malko, "Energy transfer from colloidal nanocrystals into Si substrates studied via photoluminescence photon counts and decay kinetics," J. Opt. Soc. Am. B 30, 2401-2408 (2013)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-30-9-2401

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