Photoluminescence spectrum of highly excited single CdS nanocrystals studied by a scanning near-field optical microscope

Yoshihiko Kanemitsu; Takeshi J. Inagaki; Masanobu Ando; Kazunari Matsuda; Toshiharu Saiki; C. W. White

doi:10.1063/1.1490141

Photoluminescence spectrum of highly excited single CdS nanocrystals studied by a scanning near-field optical microscope

Yoshihiko Kanemitsu, Takeshi J. Inagaki, Masanobu Ando, Kazunari Matsuda, Toshiharu Saiki, C. W. White

Research output: Contribution to journal › Article

17 Citations (Scopus)

Abstract

Many-body effects in strongly photoexcited single CdS nanocrystals embedded in Al₂O₃ matrices have been studied by a scanning near-field optical microscope at low temperatures. Under weak excitations, we find a sharp photoluminescence (PL) band originating from the exciton recombination. With an increase of the excitation laser energy, the PL intensity increases and the broad PL band is superimposed on the exciton-related sharp PL band. From a theoretical analysis, it was concluded that the broadening of the PL band is due to electron-hole pairs in CdS nanocrystals. The many-body effects of correlated exciton systems in CdS nanocrystals will be discussed.

Original language	English
Pages (from-to)	141-143
Number of pages	3
Journal	Applied Physics Letters
Volume	81
Issue number	1
DOIs	https://doi.org/10.1063/1.1490141
Publication status	Published - 2002 Jul 1
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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Kanemitsu, Y., Inagaki, T. J., Ando, M., Matsuda, K., Saiki, T., & White, C. W. (2002). Photoluminescence spectrum of highly excited single CdS nanocrystals studied by a scanning near-field optical microscope. Applied Physics Letters, 81(1), 141-143. https://doi.org/10.1063/1.1490141

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abstract = "Many-body effects in strongly photoexcited single CdS nanocrystals embedded in Al2O3 matrices have been studied by a scanning near-field optical microscope at low temperatures. Under weak excitations, we find a sharp photoluminescence (PL) band originating from the exciton recombination. With an increase of the excitation laser energy, the PL intensity increases and the broad PL band is superimposed on the exciton-related sharp PL band. From a theoretical analysis, it was concluded that the broadening of the PL band is due to electron-hole pairs in CdS nanocrystals. The many-body effects of correlated exciton systems in CdS nanocrystals will be discussed.",

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AU - Matsuda, Kazunari

AU - Saiki, Toshiharu

AU - White, C. W.

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AB - Many-body effects in strongly photoexcited single CdS nanocrystals embedded in Al2O3 matrices have been studied by a scanning near-field optical microscope at low temperatures. Under weak excitations, we find a sharp photoluminescence (PL) band originating from the exciton recombination. With an increase of the excitation laser energy, the PL intensity increases and the broad PL band is superimposed on the exciton-related sharp PL band. From a theoretical analysis, it was concluded that the broadening of the PL band is due to electron-hole pairs in CdS nanocrystals. The many-body effects of correlated exciton systems in CdS nanocrystals will be discussed.

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