TY - JOUR A1 - Resch-Genger, Ute ED - Martynenko, Irina ED - Baimuratov, A. S. ED - Osipova, V. A. ED - Kuznetsova, V. A. ED - Purcell-Milton, F. ED - Rukhlenko, I. D. ED - Fedorov, A. V. ED - Gun'ko, Y. K. ED - Baranov, A. V. T1 - Excitation energy dependence of the photoluminescence quantum yield of core/shell CdSe/CdS quantum dots and correlation with circular dichroism N2 - 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 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. KW - Fluorescence KW - Semiconductor KW - Nanoparticle KW - Surface chemistry KW - Quantum yield KW - Lifetime KW - Nanocrystal KW - Cysteine KW - Thiol KW - Ligand KW - Quantum dot KW - CdSe KW - Exciton KW - Circular dichroism KW - Theory KW - Excitation spectra KW - Excitation energy dependence PY - 2017 U6 - https://doi.org/10.1021/acs.chemmater.7b04478 SN - 0897-4756 SN - 1520-5002 VL - 30 IS - 2 SP - 465 EP - 471 PB - ACS Publications AN - OPUS4-44034 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -