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(a) XRD pattern of nanocrystal films. The inset is the corresponding FESEM image. (b) UV PL spectrum at 77 K.
(a) Temperature dependence PL spectra of SX emission from 77 to 300 K. (b) Evolution of SX emission peak energy with temperature; the solid curve is the corresponding fit based on Varshni’s formula [i.e., Eq. (1)]. (c) Dependence of SX emission peak intensity on the reciprocal of temperature; the solid curve is the corresponding fit based on Eq. (2).
(a) 77 K PL spectra of SX emission excited at different excitation intensities and (b) evolvement of SX emission peak energy and peak intensity with excitation intensity.
Schematic diagram of surface localized exciton recombination process and evolution of peak energy with excitation intensity. The solid and open circles are electrons and holes, respectively. The arrows indicate the radiative recombination process of surface localized exciton (SX) and free exciton (FX) in different areas of nanocrystals; SX occurs at the close surface region and FX occurs at the core of the nanocrystals.
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