Colloidal InP/ZnS Core-Shell Nanocrystals Studied by Linearly and Circularly Polarized Photoluminescence

L. Langof, L. Fradkin, E. Ehrenfreund, E. Lifshitz, O. I. Micic, A. J. Nozik

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28 Scopus Citations

Abstract

The magneto-optical properties of InP/ZnS core-shell nanocrystals (NCs) were investigated by measuring the degree of linear and circular polarization of photoluminescence (PL) spectra, in the presence of an external magnetic field under resonant or non-resonant excitation. The linearly polarized PL data strongly indicate that InP/ZnS NCs have a prolongated shape. The resonant-excited circularly polarized PL decay curves indicate that the spin relaxation time of the studied samples is shorter than the radiative lifetime of their exciton. Furthermore, the magnetic field-induced circularly polarized PL process reveals an exciton g factor (gex) of 0.55. Thus, such studies may serve as a tool to directly estimate the NC's shape anisotropy and to determine the g-factor of charge carriers and excitons in those NCs.

Original languageAmerican English
Pages (from-to)93-98
Number of pages6
JournalChemical Physics
Volume297
Issue number1-3
DOIs
StatePublished - 2004

NREL Publication Number

  • NREL/JA-590-35926

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