Influence of the Size and Dielectric Environments on the Optical Properties in CdS/ZnS Core–Shell Quantum Dot

In this work, the electronic and optical properties of CdS/ZnS core–shell quantum dots (CSQDs) capped in different matrices were investigated theoretically. Through the effective mass approximation (EMA) and the density matrix approach (DMA), the quantized energy levels and their corresponding wave functions of the system were obtained by solving the Schrödinger equation in a spherical coordinates system. In addition, the effects of the incident optical intensity, the number of dots per unit volume, dielectric mismatch of the organic and inorganic matrix, and geometric parameters of the structure, such as the core/shell radius ratio for CdS/ZnS CSQDs on the optical properties, were evaluated and discussed. The results revealed that both the size and dielectric environments had a substantial effect on the optical features of these nanostructures.