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Excitation energy dependence of the photoluminescence quantum yield of core/shell CdSe/CdS quantum dots and correlation with circular dichroism
- Quantum dot (QD) based nanomaterials are very promising materials for the fabrication of optoelectronic devices like solar cells, light emitting diodes (LEDs), and photodetectors as well as as reporters for chemo- and biosensing and bioimaging. Many of These applications involve the monitoring of changes in photoluminescence intensity and energy transfer processes which can strongly depend on excitation wavelength or energy. In this work, we analyzed the excitation energy dependence (EED) of the photoluminescence quantum yields (PL QYs) and decay kinetics and the circular dichroism (CD) spectra of CdSe/CdS core/shell QDs with different thicknesses of the surface passivation shell. Our results demonstrate a strong correlation between the spectral position of local maxima observed in the EED of PL QY and the zero-crossing points of the CD profiles. Theoretical analysis of the energy band structure of the QDs with effective mass approximation suggests that these structures couldQuantum dot (QD) based nanomaterials are very promising materials for the fabrication of optoelectronic devices like solar cells, light emitting diodes (LEDs), and photodetectors as well as as reporters for chemo- and biosensing and bioimaging. Many of These applications involve the monitoring of changes in photoluminescence intensity and energy transfer processes which can strongly depend on excitation wavelength or energy. In this work, we analyzed the excitation energy dependence (EED) of the photoluminescence quantum yields (PL QYs) and decay kinetics and the circular dichroism (CD) spectra of CdSe/CdS core/shell QDs with different thicknesses of the surface passivation shell. Our results demonstrate a strong correlation between the spectral position of local maxima observed in the EED of PL QY and the zero-crossing points of the CD profiles. Theoretical analysis of the energy band structure of the QDs with effective mass approximation suggests that these structures could correspond to exciton energy levels. This underlines the potential of CD spectroscopy for the study of electronic energy structure of chiroptically active nanocrystals which reveal quantum confinement effects.…
Autor*innen: | Ute Resch-GengerORCiD |
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Persönliche Herausgeber*innen: | Irina Martynenko, A. S. Baimuratov, V. A. Osipova, V. A. Kuznetsova, F. Purcell-Milton, I. D. Rukhlenko, A. V. Fedorov, Y. K. Gun'ko, A. V. Baranov |
Dokumenttyp: | Zeitschriftenartikel |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | Chemistry Of Materials |
Jahr der Erstveröffentlichung: | 2017 |
Verlag: | ACS Publications |
Jahrgang/Band: | 30 |
Ausgabe/Heft: | 2 |
Erste Seite: | 465 |
Letzte Seite: | 471 |
DDC-Klassifikation: | Naturwissenschaften und Mathematik / Chemie / Analytische Chemie |
Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten | |
Freie Schlagwörter: | CdSe; Circular dichroism; Cysteine; Excitation energy dependence; Excitation spectra; Exciton; Fluorescence; Lifetime; Ligand; Nanocrystal; Nanoparticle; Quantum dot; Quantum yield; Semiconductor; Surface chemistry; Theory; Thiol |
DOI: | 10.1021/acs.chemmater.7b04478 |
ISSN: | 0897-4756 |
ISSN: | 1520-5002 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 08.02.2018 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 08.02.2018 |