Exciton Absorption and Luminescence in CdSe Nanoplatelets: the Influence of Uniform Electric Field

Abstract

The exciton absorption and photoluminescence processes in a uniform electrostatic field perpendicular to the quantization direction in a CdSe nanoplatelet (NPL) are considered. Within the framework of the Takagahara model, the effects of charge carrier polarization in the axial direction are considered. The dependence on incident photon energy is analyzed for exciton absorption, and luminescence coefficients are calculated within the same model. The effects of the NPL’s geometric parameters and the strength of the external field on the absorption and luminescence coefficients are also examined. The results show that when the external field increases, the heights of both the absorption and luminescence peaks decrease. Simultaneously, the corresponding peaks broaden with increasing field strength.