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U N D E R C O N S T R U C T I O N
Photoluminescence (PL) is an optical phenomenon in which a material absorbs, upon excitation, an electromagnetic radiation of one wavelength and then re-radiates another electromagnetic radiation at a different wavelength. Photostimulated Luminescence (PSL) is also an optical phenomenon, just like photoluminescence (PL), which releases an electromagnetic radiation when a material with stored electron-hole pairs is stimulated with another electromagnetic radiation (usually a laser beam). Optical absorption is a phenomenon in which the energy of a photon of an electromagnetic radiation is absorbed by the electrons of a material. Region A (called as Tauc Plot), Region B (Urbach Tail), and Region C are the three absorption regimes in the plot as shown below.  |
