TY - JOUR
T1 - Excited state relaxation mechanisms in InP colloidal quantum dots
AU - Rumbles, Garry
AU - Selmarten, Don
AU - Ellingson, Randy E.
AU - Blackburn, Jeff
AU - Yu, Pingrong
AU - Smith, Barton B.
AU - Micic, Olga I.
AU - Nozik, Arthur J.
N1 - Funding Information:
We would like to that the US Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences for generous financial support.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2001
Y1 - 2001
N2 - 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.
AB - 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.
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U2 - 10.1557/proc-667-g6.3
DO - 10.1557/proc-667-g6.3
M3 - Conference article
AN - SCOPUS:0035744408
VL - 667
SP - G631-G637
JO - Materials Research Society Symposium - Proceedings
JF - Materials Research Society Symposium - Proceedings
SN - 0272-9172
T2 - Luminescent and Lumiescent Materials
Y2 - 17 April 2001 through 19 April 2001
ER -