What Happens When the Nanostructure Size is Smaller than the Exciton Bohr Radius?
When the size of the nanostructure is smaller than the exciton Bohr radius, the electron and hole are confined in a smaller volume than they would be in bulk material. This quantum confinement leads to discrete energy levels, much like in an atom, rather than the continuous bands found in bulk materials. As a result, the bandgap of the material increases, leading to changes in its optical and electronic properties. For example, in quantum dots, the emission color can be tuned by changing the size of the dot.
