PRESSURE RAMAN-SCATTERING OF CDTE QUANTUM DOTS

A series of zinc-blende CdTe quantum dots in glass was investigated us ing Raman scattering and luminescence. The dot size was controlled by varying the annealing conditions. Luminescence was employed as a probe for quality of the sample and its adequacy for resonance. Resonant Ra man spectra at the lowest confined energy levels of the quantum dots w ere obtained in function of the pressure in the range 1 bar to 4.6 GPa . The upper limit was established by a phase transition probably to Na Cl structure, simultaneous with disappearance of Raman signal. In the latter phase, first-order Raman scattering is forbidden. The Gruneisen parameter for the LO phonon of CdTe quantum dots is given.