Concept explainers
Interpretation:
The value of quenching rate constant
Concept introduction:
Quenching: The reduction in fluorescence intensity due to a number of processes.
These processes can occur during the excited state life time (example: collsional quenching, energy transfer, charge transfer reactions) or they may occur due to formation of complexes in the ground state.
Using Stern-Volmer relation the quenching rate constant
In fluorescence, the radiation that is emitted spontaneously ceases as soon as the (within nanoseconds) the exciting radiation gets extinguished.
In phosphorescence, an intersystem crossing to a triplet state takes place and hence the radiation that is emitted spontaneously will persist for more time.
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