Anomalies in the linear absorption, transient absorption, photoluminescence and photoluminescence excitation spectroscopies of colloidal InP quantum dots

Gary Rumbles, Donald C. Selmarten, Randy J. Ellingson, Jeffrey L. Blackburn, Pingrong Yu, Barton B. Smith, Olga I. Mićić, Arthur J. Nozik

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

We report photoluminescence (PL), linear absorption and femtosecond, transient bleaching spectra for a colloidal solution of indium phosphide (InP) quantum dots (QDs) at ambient temperature. The PL quantum yield is shown to depend significantly upon the excitation wavelength and the PL excitation spectrum deviates markedly from the absorption spectrum. The cooling of electrons and holes to the lowest energy excited state is determined, by transient bleaching spectroscopy, to occur with an efficiency that is independent of the excitation wavelength. These results are discussed in terms of a threshold for a non-radiative decay process that resides above the bandgap and a PL quantum yield that depends upon the size of QD.

Original languageEnglish
Pages (from-to)187-195
Number of pages9
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume142
Issue number2-3
Publication statusPublished - Sep 14 2001

Keywords

  • InP quantum dots
  • Linear absorption
  • Photoluminescence
  • Transient absorption

ASJC Scopus subject areas

  • Bioengineering
  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of 'Anomalies in the linear absorption, transient absorption, photoluminescence and photoluminescence excitation spectroscopies of colloidal InP quantum dots'. Together they form a unique fingerprint.

  • Cite this