Exciton-Phonon Scattering in CdSe/ZnSe Quantum Dots

A temperature-dependent photoluminescence measurement is performed in the CdSe/ZnSe quantum dots with a ZnCdSe quantum well. We deduce the temperature dependence of the exciton line-width and peak energy of the zero-dimensional exciton in the quantum dots and two-dimensional exciton in the CdSe wetting layer. The experimental data reveals a reduction of homogeneous broadening of exciton line in the quantum dots in comparison with that in the two-dimensional wetting layer, which indicates the decrease of exciton and optical phonon coupling in the CdSe quantum dots.