In Nanomaterials, photoluminescence occurs similarly to bulk materials, but with unique characteristics due to the quantum confinement effect. When the size of the nanomaterial approaches or is smaller than the exciton Bohr radius, the electronic energy levels become discrete rather than continuous. This results in Quantum Dots and other nanoscale materials exhibiting size-dependent photoluminescence properties, where the emission wavelength can be tuned by simply changing the size of the nanoparticles.
