Generation and rate constant of phosphorescence
Phosphorescence is another important type of excited state radiation transition, which is the radiation released when excited state molecules lose their lives to low energy states with different multiplicity. Usually observed phosphorescence is the radiation released when the first excited triplet state (Ti) transits to the ground state (S) (Kasha rule). Generally, phosphorescence is much weaker than fluorescence, because the T-state emitting phosphorescence is usually not easy to directly absorb photons from the S-state, and the T-state is mainly formed...

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