Controlled exciton properties in UV light-emitting devices using multilayer cylindrical quantum dots: Improvement through hydrostatic pressure, temperature and strain effects

Abstract

We have examined the optical characteristics of an exciton trapped in a multilayer cylindrical quantum dot, taking into account the impact of external perturbations and finite barrier confinement potentials. We compute the emission wavelength, oscillator strength, binding energy, exciton radiative lifetime, and interband transition energy (photoluminescence). Together with the effective mass approximation, a variational approach is used to calculate these energies. Furthermore, we investigate the impact of first barrier material concentration and geometric parameters like core radius and height. We also investigate how temperature and pressure affect opto-excitonic characteristics, both with and without strain effects. Our results show that the geometrical parameters influence not only the ground-state binding energy and the interband transition energy, but also affect the oscillator strength and the radiative lifetime. The application of pressure increases the exciton binding energy, radiative lifetime and interband transition energy, while reducing the oscillator strength and emission wavelength. We also demonstrate that deformation significantly modifies the edges of the conduction and valence bands.