Photoinduced fluorescence enhancement in colloidal CdSeTeZnS core/shell quantum dots

C. T. Yuan; W. C. Chou; D. S. Chuu; Y. N. Chen; C. A. Lin; W. H. Chang

doi:10.1063/1.2921779

Photoinduced fluorescence enhancement in colloidal CdSeTeZnS core/shell quantum dots

C. T. Yuan, W. C. Chou, D. S. Chuu, Y. N. Chen, C. A. Lin, W. H. Chang

Department of Physics

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

18 Citations (Scopus)

Abstract

Photoinduced fluorescence enhancement (PFE) in colloidal CdSeTeZnS core/shell quantum dots (QDs) was investigated by monitoring ensemble fluorescence and single-QD fluorescence blinking behavior upon illumination. Ensemble fluorescence was increased in air and in vacuum with different enhanced factors. At the single-QD levels, fluorescence was also enhanced for some individual QDs. Relatively long on times, high quantum yields within the on times, and multilevel on states were found in fluorescence time traces. We suggest that the PFE origin from single-QD viewpoint is attributed to the contributions of surface passivation by photoinduced charged carriers and the formation of neutral core/charged shell QD states.

Original language	English
Article number	183108
Journal	Applied Physics Letters
Volume	92
Issue number	18
DOIs	https://doi.org/10.1063/1.2921779
Publication status	Published - 2008

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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title = "Photoinduced fluorescence enhancement in colloidal CdSeTeZnS core/shell quantum dots",

abstract = "Photoinduced fluorescence enhancement (PFE) in colloidal CdSeTeZnS core/shell quantum dots (QDs) was investigated by monitoring ensemble fluorescence and single-QD fluorescence blinking behavior upon illumination. Ensemble fluorescence was increased in air and in vacuum with different enhanced factors. At the single-QD levels, fluorescence was also enhanced for some individual QDs. Relatively long on times, high quantum yields within the on times, and multilevel on states were found in fluorescence time traces. We suggest that the PFE origin from single-QD viewpoint is attributed to the contributions of surface passivation by photoinduced charged carriers and the formation of neutral core/charged shell QD states.",

author = "Yuan, {C. T.} and Chou, {W. C.} and Chuu, {D. S.} and Chen, {Y. N.} and Lin, {C. A.} and Chang, {W. H.}",

note = "Funding Information: This work was supported by MOE-ATU and the National Science Council under Grant Number NSC 96-2112-M-009-026-MY3. ",

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AU - Yuan, C. T.

AU - Chou, W. C.

AU - Chuu, D. S.

AU - Chen, Y. N.

AU - Lin, C. A.

AU - Chang, W. H.

N1 - Funding Information: This work was supported by MOE-ATU and the National Science Council under Grant Number NSC 96-2112-M-009-026-MY3.

PY - 2008

Y1 - 2008

N2 - Photoinduced fluorescence enhancement (PFE) in colloidal CdSeTeZnS core/shell quantum dots (QDs) was investigated by monitoring ensemble fluorescence and single-QD fluorescence blinking behavior upon illumination. Ensemble fluorescence was increased in air and in vacuum with different enhanced factors. At the single-QD levels, fluorescence was also enhanced for some individual QDs. Relatively long on times, high quantum yields within the on times, and multilevel on states were found in fluorescence time traces. We suggest that the PFE origin from single-QD viewpoint is attributed to the contributions of surface passivation by photoinduced charged carriers and the formation of neutral core/charged shell QD states.

AB - Photoinduced fluorescence enhancement (PFE) in colloidal CdSeTeZnS core/shell quantum dots (QDs) was investigated by monitoring ensemble fluorescence and single-QD fluorescence blinking behavior upon illumination. Ensemble fluorescence was increased in air and in vacuum with different enhanced factors. At the single-QD levels, fluorescence was also enhanced for some individual QDs. Relatively long on times, high quantum yields within the on times, and multilevel on states were found in fluorescence time traces. We suggest that the PFE origin from single-QD viewpoint is attributed to the contributions of surface passivation by photoinduced charged carriers and the formation of neutral core/charged shell QD states.

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Photoinduced fluorescence enhancement in colloidal CdSeTeZnS core/shell quantum dots

Abstract

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