Photoluminescence (PL) spectra and dynamics of hexagonal CdS nanocrystals embedded in Al2O3 matrices have been studied by means of a scanning near-field optical microscope at 8 K. The PL spectra of individual CdS nanocrystals show narrow lines with single-exponential decay profiles, although the macroscopic PL spectra measured by conventional optics show a broad band with non-exponential decay profiles. The PL peaks are observed at energies below the lowest free-exciton energy of CdS nanocrystals. The luminescence mechanism of CdS nanocrystals is discussed.
|Number of pages||4|
|Journal||Physica Status Solidi (A) Applied Research|
|Publication status||Published - 2002 Apr|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics