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 language | English |
|---|---|
| Title of host publication | Materials Research Society Symposium - Proceedings |
| Editors | P Schmidt, K Mishra, B di Bartolo, J McKittrick, AM Srivastava |
| Volume | 667 |
| Publication status | Published - 2001 |
| Event | Luminescent and Lumiescent Materials - San Francisco, CA, United States Duration: Apr 17 2001 → Apr 19 2001 |
Other
| Other | Luminescent and Lumiescent Materials |
|---|---|
| Country | United States |
| City | San Francisco, CA |
| Period | 4/17/01 → 4/19/01 |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
Cite this
Excited state relaxation mechanisms in InP colloidal quantum dots. / Rumbles, Gary; Selmarten, Don; Ellingson, Randy E.; Blackburn, Jeff; Yu, Pingrong; Smith, Barton B.; Micic, Olga I.; Nozik, Arthur J.
Materials Research Society Symposium - Proceedings. ed. / P Schmidt; K Mishra; B di Bartolo; J McKittrick; AM Srivastava. Vol. 667 2001.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Excited state relaxation mechanisms in InP colloidal quantum dots
AU - Rumbles, Gary
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.
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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M3 - Conference contribution
VL - 667
BT - Materials Research Society Symposium - Proceedings
A2 - Schmidt, P
A2 - Mishra, K
A2 - di Bartolo, B
A2 - McKittrick, J
A2 - Srivastava, AM
ER -