Numerical modelling of electronic and optical properties for different sizes of CdSe/ZnS quantum dots under temperature and hydrostatic pressure effects.

In this paper, we theoretically investigate the electronic and optical properties of CdSe/ZnS quantum dots (QDs) of varying sizes. We calculate the energy eigenvalues and wave functions dependence on QD dimensions, temperature, and pressure using a combination of coordinate transformation and the finite difference method. We analyze the oscillator strength, transition lifetime, absorption coefficients (AC), and refractive index changes (RIC) for various values of dot sizes, temperature, hydrostatic pressure, and incident photon intensity. The results obtained indicate a strong dependence of electronic and optical properties on temperature, hydrostatic pressure, and the size of the nanostructure. The oscillator strength decreased with increasing hydrostatic pressure, but increased with rising temperature. Conversely, the transition lifetime exhibits an opposite trend. Furthermore, the total AC and RIC increase as incident optical intensity decreases. Linear, nonlinear, and total AC and RIC display a red shift with increasing hydrostatic pressure and a blue shift with rising temperature. [ABSTRACT FROM AUTHOR]