What is the different between florencence and phosforecence?

Answer 1

Fluorescence and phosphorescence are both forms of photoluminescence, where materials absorb photons and re-emit them. The key difference lies in the duration of the emitted light; fluorescence occurs almost instantaneously (within nanoseconds) and ceases immediately when the excitation source is removed. In contrast, phosphorescence involves a longer-lived excited state, allowing the material to continue emitting light for seconds to hours after the excitation source is removed. This difference is primarily due to the mechanisms of energy transitions involved in each process.