Absorption and Luminescence Processes

Absorption

Fluorescence

Energy

Excited Singlet (S1)

Excited Triplet (T1)

Radiationless (thermal) decay

Phosphorescence

Fluorescence: Spin allowed, fast (10-8-10-10 sec)

Phosphorescence: Spin forbidden, slow (10-6-102 sec)

Radiationless deactivation competes

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