Enhancing Silicon Nanocrystal Photoluminescence through Temperature and Microstructure

Samuel L. Brown, Dayton J. Vogel, Joseph B. Miller, Talgat M. Inerbaev, Rebecca J. Anthony, Uwe R. Kortshagen, Dmitri S. Kilin, Erik K. Hobbie

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Routes to enhancing the photoluminescence (PL) of colloidal silicon nanocrystals (SiNCs) typically focus on changes in surface chemistry and the associated improvements in quantum yield. Here, we report a new more indirect approach that instead exploits the structure of the host matrix. Specifically, we demonstrate that changes in microstructure associated with a thermotropic phase transition in unbound ligand can increase the excitation fluence through scattering, yielding dramatic improvements in PL intensity without any discernible changes in fluorescence lifetime or quantum yield. Using size-purified plasma-synthesized SiNCs prepared as solid and liquid samples, we use experiment and computation to examine both intrinsic size-resolved differences in the temperature-dependent PL and an anomalous contribution linked to matrix microstructure. Beyond revealing a potential new route to improved PL intensity, our results further clarify the role of surface states and the challenges that they present.

Original languageEnglish (US)
Pages (from-to)18909-18916
Number of pages8
JournalJournal of Physical Chemistry C
Volume120
Issue number33
DOIs
StatePublished - Aug 25 2016

Bibliographical note

Funding Information:
E.K.H. acknowledges support of the National Science Foundation (NSF) through CBET-1133135. R.J.A. and U.R.K. acknowledge primary support through the NSF under MRSEC Grants DMR-0819885 and DMR-1420013. T.I. gratefully acknowledges financial support of the Ministry of Education and Science of the Russian Federation in the framework of the Increase Competitiveness Program of NUST MISIS (K3-2016-021).

Publisher Copyright:
© 2016 American Chemical Society.

How much support was provided by MRSEC?

  • Partial

Reporting period for MRSEC

  • Period 3

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