The effective mass approximation is particularly useful for describing the electronic properties of semiconductor quantum dots because it allows for a simplified description of the energy states of electrons in these systems. It also enables a better understanding of the optical and electronic properties of quantum dots, such as their absorption and emission spectra, and it can be used to optimize the design of quantum dot-based devices, such as LEDs and solar cells.Additionally, the effective mass approximation can be used to predict the temperature dependence of the electronic properties of quantum dots, which is important for understanding their performance in different operating conditions. It can also be used to predict the behavior of quantum dots in the presence of external electric and magnetic fields, which can be useful for designing quantum dot-based sensors and other devices.

Electron moving energy in low dimension material mass reduction happened. And this (mass reduction energy)energy conversion measured to approximate effective mass..