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Jablonski diagram video describes the various photophysical processes • Radiative processes- Fluorescence process, phosphorescence process • Non-radiative processes - vibrational relaxation, internal conversion , inter-system crossing • You will be able to • draw Jablonski diagram • discuss the various transitions using Jablonski diagram • classify the radiative and non-radiative transitions • explain vibrational relaxation, internal conversion and inter-system crossing • elaborate the process of fluorescence and phosphorescence • Jablonski diagram is a pictorial representation of the energy diagram illustrating the various electronic and vibrational levels and different transitions occurring within them. • Radiation-less transition/Non-radiative transitions • (Only heat loss without emission of light) • Internal conversion • Transition from a higher vibrational level to lower vibrational level of same state. (e.g. from a vibrational level of S2 to a vibrational level of S1 with same energy). • This occurs in the range of 10-14 to 10-11 s • Inter-system crossing • Transition from a vibrational level of one state to a vibrational level of another state of same energy (e.g. a vibrational level of S1 to a vibrational level of T1 with same energy). • This occurs in the range of 10-11 to 10-6 s • Radiative transition/Radiation transition (emits light during transition) • Fluorescence • Transition from lowest vibrational level of S1 to any vibrational level of S0 by emitting light. Fluorescence stops right after the source of radiation is switched off. This occurs in the range of 10-9 to 10-6 s. • Fluorescent inks, paints, blue fluorescent dye in detergents, reflector plates in vehicles. • Radiative transition/Radiation transition (emits light during transition) • Phosphorescence • Transition from lowest vibrational level of T1 to any vibrational level of S0 by emitting light. Phosphorescence continues even after source is removed.  • This occurs in the range of 10-6 to 10 s • Phosphorescent inks and paint in fire-extinguishers, clock dials etc., phosphorescent pigment “resin mold” used in glow-in-the-dark toys, stickers 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