Related Nova Publications 113from ~3.2 to ~1.8 eV. Vibrational Raman spectra of CdS-PEI QDs exhibit a
main peak at 250−300 cm-^1 which is a superposition of longitudinal, transverse
and surface-related vibrational modes, broadened due to spatial phonon
confinement and structural reconstruction of QDs. Dendrimer-stabilized CdS
QDs emit electroluminescence in the range of 450700 nm under applied
voltage higher than 6 V. Unusually strong temperature dependences of
photoluminescence intensity and spectral maximum energy of CdS-PEI QDs
in aqueous solutions and PEI films in the range of 280−353 К were found and
interpreted in terms of reversible dissociation of a PEI complex with under-
coordinated Cd(II) atoms on the QD surface.