Role of surface ligands in optical properties of colloidal CdSe/CdS quantum dots

Zhijun Ning; Matyas Molnár; Yun Chen; Peter Friberg; Liming Gan; Hans Ågren; Ying Fu

doi:10.1039/c0cp02688c

Role of surface ligands in optical properties of colloidal CdSe/CdS quantum dots

Zhijun Ning
, Matyas Molnár
, Yun Chen
, Peter Friberg
, Liming Gan
, Hans Ågren
, Ying Fu^*

^*Corresponding author for this work

KTH Royal Institute of Technology
University of Gothenburg
AstraZeneca

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

61 Scopus citations

Abstract

In order to study the role of surface ligands in determining optical properties of colloidal quantum dots (QDs), we have selectively fabricated and studied CdSe/CdS core-shell QDs with strongly confined electron and hole states attached with commonly used surface ligands. Optical properties, viz. absorption and fluorescence of these QDs, are characterized from which salient changes have been observed for different ligand substitutions which, through theoretical analysis, can be associated with electronic structure properties of the QD-ligand composite systems, in particular localization of wave functions of electrons and holes in the QDs and the band matching of the HOMO-LUMO gap of the ligands. The findings can be utilized to facilitate the understanding and optimization of properties of QD biomarkers with functionalizing surface ligands for targeting cellular objects.

Original language	English
Pages (from-to)	5848-5854
Number of pages	7
Journal	Physical Chemistry Chemical Physics
Volume	13
Issue number	13
DOIs	https://doi.org/10.1039/c0cp02688c
State	Published - 7 Apr 2011
Externally published	Yes

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abstract = "In order to study the role of surface ligands in determining optical properties of colloidal quantum dots (QDs), we have selectively fabricated and studied CdSe/CdS core-shell QDs with strongly confined electron and hole states attached with commonly used surface ligands. Optical properties, viz. absorption and fluorescence of these QDs, are characterized from which salient changes have been observed for different ligand substitutions which, through theoretical analysis, can be associated with electronic structure properties of the QD-ligand composite systems, in particular localization of wave functions of electrons and holes in the QDs and the band matching of the HOMO-LUMO gap of the ligands. The findings can be utilized to facilitate the understanding and optimization of properties of QD biomarkers with functionalizing surface ligands for targeting cellular objects.",

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T1 - Role of surface ligands in optical properties of colloidal CdSe/CdS quantum dots

AU - Ning, Zhijun

AU - Molnár, Matyas

AU - Chen, Yun

AU - Friberg, Peter

AU - Gan, Liming

AU - Ågren, Hans

AU - Fu, Ying

PY - 2011/4/7

Y1 - 2011/4/7

N2 - In order to study the role of surface ligands in determining optical properties of colloidal quantum dots (QDs), we have selectively fabricated and studied CdSe/CdS core-shell QDs with strongly confined electron and hole states attached with commonly used surface ligands. Optical properties, viz. absorption and fluorescence of these QDs, are characterized from which salient changes have been observed for different ligand substitutions which, through theoretical analysis, can be associated with electronic structure properties of the QD-ligand composite systems, in particular localization of wave functions of electrons and holes in the QDs and the band matching of the HOMO-LUMO gap of the ligands. The findings can be utilized to facilitate the understanding and optimization of properties of QD biomarkers with functionalizing surface ligands for targeting cellular objects.

AB - In order to study the role of surface ligands in determining optical properties of colloidal quantum dots (QDs), we have selectively fabricated and studied CdSe/CdS core-shell QDs with strongly confined electron and hole states attached with commonly used surface ligands. Optical properties, viz. absorption and fluorescence of these QDs, are characterized from which salient changes have been observed for different ligand substitutions which, through theoretical analysis, can be associated with electronic structure properties of the QD-ligand composite systems, in particular localization of wave functions of electrons and holes in the QDs and the band matching of the HOMO-LUMO gap of the ligands. The findings can be utilized to facilitate the understanding and optimization of properties of QD biomarkers with functionalizing surface ligands for targeting cellular objects.

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DO - 10.1039/c0cp02688c

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SP - 5848

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JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

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ER -

Role of surface ligands in optical properties of colloidal CdSe/CdS quantum dots

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