Shape-dependent confined excitons and acoustic phonons of CuCl nanocrystals embedded in NaCl crystals

The confined excitons and acoustic phonons of CuCl nanocrystals embedded in NaCl crystals were studied by the persistent spectral-hole-burning (PSHB) spectroscopy. A resonant hole and many low-energy satellite holes as well a s longitudinal, transverse optical, and acoustic phonon sidebands were obse rved in the PSHB spectra. The satellite holes come from the hole burning of the ground-state excitons under the site-selective excitation of the corre sponding excited states in the nanocrystals of nearly cubic shapes. The con fined acoustic phonons in CuCl nanocrystals were explained as the low-frequ ency vibrational modes of nearly cubic quantum boxes. (C) 2000 Elsevier Sci ence B.V. All rights reserved.