Studies of optical properties of single CdS nanorods
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This work describes low-temperature studies of the optical properties of single CdS nanorods in relation to the nanorods’ morphology. Keeping track of the same nanorods in the photoluminescence (PL) study and during the scanning electron microscope (SEM) imaging we were able to distinguish intrinsic spectral features of the nanorods from those of nanocluster aggregates. We observed strong photoluminescence polarization in the direction perpendicular to the nanorods’ axis. The sharp peaks in the “blue” region of the photoluminescence spectra are red-shifted relative to those of the bulk CdS and of the CdS microparticles in the glass matrix. Finally, we observe a very interesting “spectral diffusion” of the main emission peaks with the following characteristics: (a) energy-energy correlation of the two main peaks; (b) Correlation and anticorrelation between energy and intensity for the two peaks. Possible mechanisms behind this phenomenon are discussed.