Abstract
The exciton and phonon coupling is an important factor to affect the photoluminescence of nanocrystals. The temperature- and size-dependent photoluminescence was employed in this paper to investigate the influence of exciton and phonon coupling in colloidal PbSe nanocrystals. The experimental results show that the photoluminescence peak of PbSe nanocrystals with the small particle size shifts to red and the photoluminescence peak of PbSe nanocrystals with the large particle size shifts to blue when the temperature increases. The photoluminescence intensity decreases and the full width at half-maximum gradually increase with the increase of temperature. This phenomenon is mainly attributed to the interaction between the exciton and phonon. According to the data fitting, optical phonon energy of 16.7meV in PbSe nanocrystals is almost independent on the particle size, approximately closed to the bulk material value.
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