Excited state relaxation mechanisms in InP colloidal quantum dots

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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
Title of host publicationMaterials Research Society Symposium - Proceedings
EditorsP Schmidt, K Mishra, B di Bartolo, J McKittrick, AM Srivastava
Volume667
Publication statusPublished - 2001
EventLuminescent and Lumiescent Materials - San Francisco, CA, United States
Duration: Apr 17 2001Apr 19 2001

Other

OtherLuminescent and Lumiescent Materials
CountryUnited States
CitySan Francisco, CA
Period4/17/014/19/01

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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  • Cite this

    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. In P. Schmidt, K. Mishra, B. di Bartolo, J. McKittrick, & AM. Srivastava (Eds.), Materials Research Society Symposium - Proceedings (Vol. 667)