Correlation between Cu+-ion instability and persistent spectral hole-burning phenomena of CuCl nanocrystals

We have studied persistent spectral hole-burning (PSHB) phenomena of CuCl nanocrystals embedded in a NaCl crystal. We found correlations between the PSHB phenomena and the photoluminescence spectral changes of excitons in CuCl nanocrystals and of Cu+ dimers in a NaCl crystal. The spectral changes can be triggered by photoinduced Cu+-ion displacements in CuCl nanocrystals and in a NaCl crystal