On the Excitation Wavelength Dependence of the Luminescence Yield of Colloidal CdSe Quantum Dots

Absorption and photoluminescence excitation (PLE) spectra were recorded for colloidal CdSe quantum dots of different sizes. No significant deviation between the PLE and the absorption spectra, provided appropriate corrections and sample treatment are made were found. This implies that there is no intrinsic wavelength dependence of the luminescence quantum yield, in line with the ultrafast intraband relaxation processes reported in the literature. Probably a possible source for the deviations reported in the literature is the scattering produced by aggregates formed of nanodots and org. ligands in as-prepd. colloidal solns. [on SciFinder (R)]