Evaluating the transition dipole moment of quantum dots with absorption and angle resolved photo-luminescence spectroscopy

TL;DR

This paper presents a method to evaluate the transition dipole moment of alloyed quantum dots using absorption and angle-resolved photoluminescence spectroscopy, providing insights into their optical properties.

Contribution

It introduces an evaluation procedure for the transition dipole moment and its orientation in quantum dots using combined spectroscopic techniques.

Findings

TDM magnitude of AQDs is 9.07 D in vacuum.

AQD emission is isotropic based on anisotropy coefficient.

Method enables detailed optical characterization of quantum dots.

Abstract

In this manuscript, the evaluation procedure of transition dipole moment (TDM) is discussed. Semiconducting Cd_{x}Zn_{1-x}Se_{y}S_{1-y} alloyed quantum dots (AQDs) are used as the two level emitting system. The AQDs are then self-assembled into monolayers by the Langmuir-Schaefer method. The TDM magnitude and orientation of AQDs are extracted from the absorption spectrum and the angle resolved Photo-luminescence emission spectrum measurements respectively. The TDM of AQDs in vacuum is evaluated as 9.07 D and the anisotropy coefficient shows that the AQD emission is isotropic.