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

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

National Renewable Energy Laboratory

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 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

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials

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

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

Rumbles, G, Selmarten, D, Ellingson, RE, Blackburn, J, Yu, P, Smith, BB, Micic, OI & Nozik, AJ 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, Luminescent and Lumiescent Materials, San Francisco, CA, United States, 4/17/01.

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title = "Excited state relaxation mechanisms in InP colloidal quantum dots",

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.",

author = "Gary Rumbles and Don Selmarten and Ellingson, {Randy E.} and Jeff Blackburn and Pingrong Yu and Smith, {Barton B.} and Micic, {Olga I.} and Nozik, {Arthur J.}",

year = "2001",

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volume = "667",

editor = "P Schmidt and K Mishra and {di Bartolo}, B and J McKittrick and AM Srivastava",

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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

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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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