Time- And polarization-resolved optical spectroscopy of colloidal CdSe nanocrystal quantum dots in high magnetic fields

Madalina Furis, Jennifer A. Hollingsworth, Victor I. Klimov, Scott A. Crooker

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

In an effort to elucidate the spin (rather than charge) degrees of freedom in colloidal semiconductor nanocrystal quantum dots, we report on a series of static and time-resolved photoluminescence measurements of colloidal CdSe quantum dots in ultrahigh magnetic fields up to 45 T. At low temperatures (1.5-40 K), the steady-state photoluminescence (PL) develops a high degree of circular polarization with applied magnetic field, indicating the presence of spin-polarized excitons. Time-resolved PL studies reveal a marked decrease in radiative exciton lifetime with increasing magnetic field and temperature. Except for an initial burst of unpolarized PL immediately following photoexcitation, high-field time-resolved PL measurements reveal a constant degree of circular polarization throughout the entire exciton lifetime, even in the presence of pronounced exciton transfer via Förster energy transfer processes.

Original languageEnglish
Pages (from-to)15332-15338
Number of pages7
JournalJournal of Physical Chemistry B
Volume109
Issue number32
DOIs
Publication statusPublished - Aug 18 2005

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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