P. Lefebvre et al., MEASUREMENT OF THE OPTICAL BAND-GAP AND CRYSTAL-FIELD SPLITTING IN WURTZITE CDTE, Physical review. B, Condensed matter, 53(23), 1996, pp. 15440-15442
CdTe nanocrystals embedded in a sodium borosilicate matrix, obtained b
y a sol-gel process, present a wurtzite (hexagonal) structure. Low-tem
perature photoluminescence and absorption spectra are measured for sam
ples containing bulklike nanocrystals large enough to suppress confine
ment effects. Thus, the fundamental free-exciton gap and the splitting
between the A (Gamma(9)(v) - Gamma(7)(c)) and B (Gamma(7)(v) - Gamma(
7)(c)) excitons of bulk wurtzite CdTe are measured. We find E(g)(A) =
1653 +/- 1 meV and E(g)(A) - E(g)(B) = 46.5 +/- 1.0 meV, which corresp
onds to a crystal-field splitting Delta(cr) = 71.6 +/- 1.5 meV.