Jablonski diagram

Jablonski diagram
Originally, a diagram showing that the fluorescent state of a molecular entity is the lowest excited
state from which the transition to the ground state is allowed, whereas the phosphorescent state is
a metastable state below the fluorescent state, which is reached by radiationless transition. In the
most typical cases the fluorescent state is the lowest singlet excited state and the phosphorescent state
the lowest triplet state, the ground state being a singlet.

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