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

44 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

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optical polarization
Nanocrystals
Semiconductor quantum dots
Photoluminescence
nanocrystals
Excitons
quantum dots
Polarization
Magnetic fields
photoluminescence
excitons
magnetic fields
Circular polarization
spectroscopy
circular polarization
life (durability)
Photoexcitation
photoexcitation
Energy transfer
bursts

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Time- And polarization-resolved optical spectroscopy of colloidal CdSe nanocrystal quantum dots in high magnetic fields. / Furis, Madalina; Hollingsworth, Jennifer A.; Klimov, Victor I; Crooker, Scott A.

In: Journal of Physical Chemistry B, Vol. 109, No. 32, 18.08.2005, p. 15332-15338.

Research output: Contribution to journalArticle

Furis, Madalina ; Hollingsworth, Jennifer A. ; Klimov, Victor I ; Crooker, Scott A. / Time- And polarization-resolved optical spectroscopy of colloidal CdSe nanocrystal quantum dots in high magnetic fields. In: Journal of Physical Chemistry B. 2005 ; Vol. 109, No. 32. pp. 15332-15338.
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