Band-edge excitons in PbSe nanocrystals and nanorods

J. G. Tischler; T. A. Kennedy; E. R. Glaser; Al L. Efros; E. E. Foos; J. E. Boercker; T. J. Zega; R. M. Stroud; S. C. Erwin

doi:10.1103/PhysRevB.82.245303

Band-edge excitons in PbSe nanocrystals and nanorods

J. G. Tischler, T. A. Kennedy, E. R. Glaser, Al L. Efros, E. E. Foos, J. E. Boercker, T. J. Zega, R. M. Stroud, S. C. Erwin

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

We investigate the fine structure of band-edge excitons in PbSe nanocrystals and nanorods using circularly polarized magnetophotoluminescence and optically detected magnetic resonance and, based on the results, propose a singlet-triplet model of exciton photoluminescence from nondegenerate conduction and valence bands. From the data and model we extract g -factors for electrons and holes of +1.2 and +0.8, respectively. The splitting of the triplet ground state, which is responsible for the low-temperature photoluminescence, is 88μeV for nanorods, and less than 20μeV for nanocrystals. The intervalley splitting of the electron and hole levels in the nanocrystals is much larger than the electron-hole exchange interaction.

Original language	English (US)
Article number	245303
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	82
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevB.82.245303
State	Published - 2010
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.82.245303

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abstract = "We investigate the fine structure of band-edge excitons in PbSe nanocrystals and nanorods using circularly polarized magnetophotoluminescence and optically detected magnetic resonance and, based on the results, propose a singlet-triplet model of exciton photoluminescence from nondegenerate conduction and valence bands. From the data and model we extract g -factors for electrons and holes of +1.2 and +0.8, respectively. The splitting of the triplet ground state, which is responsible for the low-temperature photoluminescence, is 88μeV for nanorods, and less than 20μeV for nanocrystals. The intervalley splitting of the electron and hole levels in the nanocrystals is much larger than the electron-hole exchange interaction.",

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T1 - Band-edge excitons in PbSe nanocrystals and nanorods

AU - Tischler, J. G.

AU - Kennedy, T. A.

AU - Glaser, E. R.

AU - Efros, Al L.

AU - Foos, E. E.

AU - Boercker, J. E.

AU - Zega, T. J.

AU - Stroud, R. M.

AU - Erwin, S. C.

PY - 2010

Y1 - 2010

N2 - We investigate the fine structure of band-edge excitons in PbSe nanocrystals and nanorods using circularly polarized magnetophotoluminescence and optically detected magnetic resonance and, based on the results, propose a singlet-triplet model of exciton photoluminescence from nondegenerate conduction and valence bands. From the data and model we extract g -factors for electrons and holes of +1.2 and +0.8, respectively. The splitting of the triplet ground state, which is responsible for the low-temperature photoluminescence, is 88μeV for nanorods, and less than 20μeV for nanocrystals. The intervalley splitting of the electron and hole levels in the nanocrystals is much larger than the electron-hole exchange interaction.

AB - We investigate the fine structure of band-edge excitons in PbSe nanocrystals and nanorods using circularly polarized magnetophotoluminescence and optically detected magnetic resonance and, based on the results, propose a singlet-triplet model of exciton photoluminescence from nondegenerate conduction and valence bands. From the data and model we extract g -factors for electrons and holes of +1.2 and +0.8, respectively. The splitting of the triplet ground state, which is responsible for the low-temperature photoluminescence, is 88μeV for nanorods, and less than 20μeV for nanocrystals. The intervalley splitting of the electron and hole levels in the nanocrystals is much larger than the electron-hole exchange interaction.

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Band-edge excitons in PbSe nanocrystals and nanorods

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