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

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.