Single molecule quantum-confined Stark effect measurements of semiconductor nanoparticles at room temperature

Kyoung Won Park, Zvicka Deutsch, J. Jack Li, Dan Oron, Shimon Weiss

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

Abstract

We investigate the quantum confined Stark effect (QCSE) of various nanoparticles (NPs) on the single molecule level at room temperature. We tested 8 different NPs with different geometry, material composition and electronic structure, and measured their QCSE by single molecule spectroscopy. This study reveals that suppressing the Coulomb interaction force between electron and hole by asymmetric type-II interface is critical for an enhanced QCSE. For example, ZnSe-CdS and CdSe(Te)-CdS-CdZnSe asymmetric nanorods (type-II) display respectively twice and more than three times larger QCSE than that of simple type-I nanorods (CdSe). In addition, wavelength blue-shift of QCSE and roughly linear Δλ-F (emission wavelength shift vs. the applied electric field) relation are observed for the type-II nanorods. Experimental results (Δλ-F or ΔE-F) are successfully reproduced by self-consistent quantum mechanical calculation. Intensity reduction in blue-shifted spectrum is also accounted for. Both calculations and experiments suggest that the magnitude of the QCSE is predominantly determined by the degree of initial charge separation in these structures.

Original languageEnglish
Title of host publicationProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume8595
DOIs
Publication statusPublished - 2013
EventColloidal Nanocrystals for Biomedical Applications VIII - San Francisco, CA, United States
Duration: Feb 2 2013Feb 4 2013

Other

OtherColloidal Nanocrystals for Biomedical Applications VIII
CountryUnited States
CitySan Francisco, CA
Period2/2/132/4/13

Fingerprint

Stark effect
Nanotubes
Quantum Dots
Semiconductor materials
Nanoparticles
nanoparticles
Molecules
Temperature
room temperature
Nanorods
nanorods
molecules
Electrons
Wavelength
polarization (charge separation)
Coulomb interactions
blue shift
wavelengths
Electronic structure
Electric fields

Keywords

  • Blue-shift
  • Electric Field
  • Nano-rod
  • Quantum Confined Stark Effect
  • Quantum dot
  • Type-I
  • Type-II
  • Voltage sensing

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Radiology Nuclear Medicine and imaging

Cite this

Park, K. W., Deutsch, Z., Li, J. J., Oron, D., & Weiss, S. (2013). Single molecule quantum-confined Stark effect measurements of semiconductor nanoparticles at room temperature. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE (Vol. 8595). [859518] https://doi.org/10.1117/12.2001566

Single molecule quantum-confined Stark effect measurements of semiconductor nanoparticles at room temperature. / Park, Kyoung Won; Deutsch, Zvicka; Li, J. Jack; Oron, Dan; Weiss, Shimon.

Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 8595 2013. 859518.

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

Park, KW, Deutsch, Z, Li, JJ, Oron, D & Weiss, S 2013, Single molecule quantum-confined Stark effect measurements of semiconductor nanoparticles at room temperature. in Progress in Biomedical Optics and Imaging - Proceedings of SPIE. vol. 8595, 859518, Colloidal Nanocrystals for Biomedical Applications VIII, San Francisco, CA, United States, 2/2/13. https://doi.org/10.1117/12.2001566
Park KW, Deutsch Z, Li JJ, Oron D, Weiss S. Single molecule quantum-confined Stark effect measurements of semiconductor nanoparticles at room temperature. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 8595. 2013. 859518 https://doi.org/10.1117/12.2001566
Park, Kyoung Won ; Deutsch, Zvicka ; Li, J. Jack ; Oron, Dan ; Weiss, Shimon. / Single molecule quantum-confined Stark effect measurements of semiconductor nanoparticles at room temperature. Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 8595 2013.
@inproceedings{853acfcb691c4747bbb9150ffbe9b8cb,
title = "Single molecule quantum-confined Stark effect measurements of semiconductor nanoparticles at room temperature",
abstract = "We investigate the quantum confined Stark effect (QCSE) of various nanoparticles (NPs) on the single molecule level at room temperature. We tested 8 different NPs with different geometry, material composition and electronic structure, and measured their QCSE by single molecule spectroscopy. This study reveals that suppressing the Coulomb interaction force between electron and hole by asymmetric type-II interface is critical for an enhanced QCSE. For example, ZnSe-CdS and CdSe(Te)-CdS-CdZnSe asymmetric nanorods (type-II) display respectively twice and more than three times larger QCSE than that of simple type-I nanorods (CdSe). In addition, wavelength blue-shift of QCSE and roughly linear Δλ-F (emission wavelength shift vs. the applied electric field) relation are observed for the type-II nanorods. Experimental results (Δλ-F or ΔE-F) are successfully reproduced by self-consistent quantum mechanical calculation. Intensity reduction in blue-shifted spectrum is also accounted for. Both calculations and experiments suggest that the magnitude of the QCSE is predominantly determined by the degree of initial charge separation in these structures.",
keywords = "Blue-shift, Electric Field, Nano-rod, Quantum Confined Stark Effect, Quantum dot, Type-I, Type-II, Voltage sensing",
author = "Park, {Kyoung Won} and Zvicka Deutsch and Li, {J. Jack} and Dan Oron and Shimon Weiss",
year = "2013",
doi = "10.1117/12.2001566",
language = "English",
isbn = "9780819493644",
volume = "8595",
booktitle = "Progress in Biomedical Optics and Imaging - Proceedings of SPIE",

}

TY - GEN

T1 - Single molecule quantum-confined Stark effect measurements of semiconductor nanoparticles at room temperature

AU - Park, Kyoung Won

AU - Deutsch, Zvicka

AU - Li, J. Jack

AU - Oron, Dan

AU - Weiss, Shimon

PY - 2013

Y1 - 2013

N2 - We investigate the quantum confined Stark effect (QCSE) of various nanoparticles (NPs) on the single molecule level at room temperature. We tested 8 different NPs with different geometry, material composition and electronic structure, and measured their QCSE by single molecule spectroscopy. This study reveals that suppressing the Coulomb interaction force between electron and hole by asymmetric type-II interface is critical for an enhanced QCSE. For example, ZnSe-CdS and CdSe(Te)-CdS-CdZnSe asymmetric nanorods (type-II) display respectively twice and more than three times larger QCSE than that of simple type-I nanorods (CdSe). In addition, wavelength blue-shift of QCSE and roughly linear Δλ-F (emission wavelength shift vs. the applied electric field) relation are observed for the type-II nanorods. Experimental results (Δλ-F or ΔE-F) are successfully reproduced by self-consistent quantum mechanical calculation. Intensity reduction in blue-shifted spectrum is also accounted for. Both calculations and experiments suggest that the magnitude of the QCSE is predominantly determined by the degree of initial charge separation in these structures.

AB - We investigate the quantum confined Stark effect (QCSE) of various nanoparticles (NPs) on the single molecule level at room temperature. We tested 8 different NPs with different geometry, material composition and electronic structure, and measured their QCSE by single molecule spectroscopy. This study reveals that suppressing the Coulomb interaction force between electron and hole by asymmetric type-II interface is critical for an enhanced QCSE. For example, ZnSe-CdS and CdSe(Te)-CdS-CdZnSe asymmetric nanorods (type-II) display respectively twice and more than three times larger QCSE than that of simple type-I nanorods (CdSe). In addition, wavelength blue-shift of QCSE and roughly linear Δλ-F (emission wavelength shift vs. the applied electric field) relation are observed for the type-II nanorods. Experimental results (Δλ-F or ΔE-F) are successfully reproduced by self-consistent quantum mechanical calculation. Intensity reduction in blue-shifted spectrum is also accounted for. Both calculations and experiments suggest that the magnitude of the QCSE is predominantly determined by the degree of initial charge separation in these structures.

KW - Blue-shift

KW - Electric Field

KW - Nano-rod

KW - Quantum Confined Stark Effect

KW - Quantum dot

KW - Type-I

KW - Type-II

KW - Voltage sensing

UR - http://www.scopus.com/inward/record.url?scp=84878186047&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84878186047&partnerID=8YFLogxK

U2 - 10.1117/12.2001566

DO - 10.1117/12.2001566

M3 - Conference contribution

SN - 9780819493644

VL - 8595

BT - Progress in Biomedical Optics and Imaging - Proceedings of SPIE

ER -