Study of fluorescence enhancement of colloidal CdSe/ZnS quantum dots bound to hexadecylamine by single-molecule measurements

Chi Tsu Yuan; Wu Ching Chou; Yueh Nan Chen; Jui Wen Chou; Der San Chuu; Cheng An J. Lin; Jimmy K. Li; Walter H. Chang; Ji Lin Shen

doi:10.1021/jp074561p

Study of fluorescence enhancement of colloidal CdSe/ZnS quantum dots bound to hexadecylamine by single-molecule measurements

Chi Tsu Yuan, Wu Ching Chou, Yueh Nan Chen, Jui Wen Chou, Der San Chuu, Cheng An J. Lin, Jimmy K. Li, Walter H. Chang, Ji Lin Shen

Department of Physics

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

24 Citations (Scopus)

Abstract

Fluorescence enhancement of colloidal CdSe/ZnS quantum dots (QDs) by the binding of hexadecylamine (HDA) ligands was investigated at the single-QD level. The blinking behavior of individual CdSe/ZnS QDs can be dramatically modified by additional HDA ligands. Both the ratio of the mean on/off time lengths and the total number of emitted photons within the on-time duration can be enhanced, by factors of up to 2.8 and 13, respectively. Consequently, the blinking rate can be suppressed down to 18%. The fluorescence decay curve is closer to a single-exponential decay profile and has a longer measured lifetime. These results suggest that HDA ligands can further improve surface passivation.

Original language	English
Pages (from-to)	15166-15172
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	111
Issue number	42
DOIs	https://doi.org/10.1021/jp074561p
Publication status	Published - 2007 Oct 25

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/jp074561p

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title = "Study of fluorescence enhancement of colloidal CdSe/ZnS quantum dots bound to hexadecylamine by single-molecule measurements",

abstract = "Fluorescence enhancement of colloidal CdSe/ZnS quantum dots (QDs) by the binding of hexadecylamine (HDA) ligands was investigated at the single-QD level. The blinking behavior of individual CdSe/ZnS QDs can be dramatically modified by additional HDA ligands. Both the ratio of the mean on/off time lengths and the total number of emitted photons within the on-time duration can be enhanced, by factors of up to 2.8 and 13, respectively. Consequently, the blinking rate can be suppressed down to 18%. The fluorescence decay curve is closer to a single-exponential decay profile and has a longer measured lifetime. These results suggest that HDA ligands can further improve surface passivation.",

author = "Yuan, {Chi Tsu} and Chou, {Wu Ching} and Chen, {Yueh Nan} and Chou, {Jui Wen} and Chuu, {Der San} and Lin, {Cheng An J.} and Li, {Jimmy K.} and Chang, {Walter H.} and Shen, {Ji Lin}",

year = "2007",

month = oct,

day = "25",

doi = "10.1021/jp074561p",

language = "English",

volume = "111",

pages = "15166--15172",

journal = "Journal of Physical Chemistry C",

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publisher = "American Chemical Society",

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T1 - Study of fluorescence enhancement of colloidal CdSe/ZnS quantum dots bound to hexadecylamine by single-molecule measurements

AU - Yuan, Chi Tsu

AU - Chou, Wu Ching

AU - Chen, Yueh Nan

AU - Chou, Jui Wen

AU - Chuu, Der San

AU - Lin, Cheng An J.

AU - Li, Jimmy K.

AU - Chang, Walter H.

AU - Shen, Ji Lin

PY - 2007/10/25

Y1 - 2007/10/25

N2 - Fluorescence enhancement of colloidal CdSe/ZnS quantum dots (QDs) by the binding of hexadecylamine (HDA) ligands was investigated at the single-QD level. The blinking behavior of individual CdSe/ZnS QDs can be dramatically modified by additional HDA ligands. Both the ratio of the mean on/off time lengths and the total number of emitted photons within the on-time duration can be enhanced, by factors of up to 2.8 and 13, respectively. Consequently, the blinking rate can be suppressed down to 18%. The fluorescence decay curve is closer to a single-exponential decay profile and has a longer measured lifetime. These results suggest that HDA ligands can further improve surface passivation.

AB - Fluorescence enhancement of colloidal CdSe/ZnS quantum dots (QDs) by the binding of hexadecylamine (HDA) ligands was investigated at the single-QD level. The blinking behavior of individual CdSe/ZnS QDs can be dramatically modified by additional HDA ligands. Both the ratio of the mean on/off time lengths and the total number of emitted photons within the on-time duration can be enhanced, by factors of up to 2.8 and 13, respectively. Consequently, the blinking rate can be suppressed down to 18%. The fluorescence decay curve is closer to a single-exponential decay profile and has a longer measured lifetime. These results suggest that HDA ligands can further improve surface passivation.

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SN - 1932-7447

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Study of fluorescence enhancement of colloidal CdSe/ZnS quantum dots bound to hexadecylamine by single-molecule measurements

Abstract

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