Question

what is (are) the origin of bandgap tuning in quantum dots? quantum confinement

Answer 1

As the confinement energy depends on the quantum dot's size, both absorption onset and fluorescence emission can be tuned by changing the size of the quantum dot during its synthesis. ... To improve fluorescencequantum yield, quantum dots can be made with "shells" of a larger bandgapsemiconductor material around them.