Question

why phosphorescence is called delayed fluorescence

Answer 1

Phosphorescence is called delayed fluorescence because it is long-lived photoluminescence.

What is the difference between fluorescence and Phosphorescence?

• The major difference between fluorescence and phosphorescence is the difference in the timing of their photoluminescence activity.
• Fluorescence is a fast photoluminescence action that takes place in a very short time.
• On the contrary,  photoluminescence continues to occur on its own even after the abrupt stop of the photoexcitation process.
• In fluorescence, singlet to triplet transition takes place whereas in phosphorescence singlet-to-singlet transition takes place.
• To put it more simply, phosphorescence emission is called a delayed process because it takes more time than the fluorescence process.

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