Excited state relaxation mechanisms in InP colloidal quantum dots

Garry Rumbles, Don Selmarten, Randy E. Ellingson, Jeff Blackburn, Pingrong Yu, Barton B. Smith, Olga I. Micic, Arthur J. Nozik

Research output: Contribution to journalConference article

Abstract

We report photoluminescence, linear absorption and femto-second transient bleaching spectra for a colloidal solution of indium phosphide (InP) quantum dots at ambient temperatures. The photoluminescence quantum yield is shown to depend not only upon the size of the quantum dots, with larger dots exhibiting higher quantum yields, but also upon the excitation wavelength. At short wavelengths, photoluminescence excitation spectra deviate markedly from the absorption spectra indicating that an efficient non-radiative deactivation pathway becomes prominent at these higher photon energies. We interpret this observation in terms of an inefficient relaxation mechanism between the second excited state and the lowest energy excited state from which the emission emanates. The results are consistent with the existence of a phonon bottleneck.

Original languageEnglish
Pages (from-to)G631-G637
JournalMaterials Research Society Symposium - Proceedings
Volume667
DOIs
Publication statusPublished - 2001
EventLuminescent and Lumiescent Materials - San Francisco, CA, United States
Duration: Apr 17 2001Apr 19 2001

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Rumbles, G., Selmarten, D., Ellingson, R. E., Blackburn, J., Yu, P., Smith, B. B., Micic, O. I., & Nozik, A. J. (2001). Excited state relaxation mechanisms in InP colloidal quantum dots. Materials Research Society Symposium - Proceedings, 667, G631-G637. https://doi.org/10.1557/proc-667-g6.3