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In a photoluminescence experiment, a sample is illuminated by a source to induce the absorption process and the excitation of the electron from the ground state to an excited state. Returning backto the ground state, the electron could emit light. This emission is spectroscopically studied. In a typical photoluminescence setup, as reported in the block scheme of Figure 1.7, two monochromators are used to select the excitation wavelength and the emission wavelength. In the following, the two kinds of measurements that can be done are illustrated.

Figure 1.10 Absorption spectra of CdSe/ZnS core–shell nanoparticles at different concentrations in toluene solution. The inset shows the peak absorbance amplitude at 585 nm as a function of concentration; the straight line is a guide for the eye.