CHEM 03
University of Lucknow
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Thesis
“FLUORESCENCE AND PHOSPHORESCENCE”
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---41January 20252024/2025A+
- Fluorescence and phosphorescence are two types of luminescence, where materials emit light 
after absorbing energy. Both phenomena are a result of electron transitions within atoms or 
molecules, but they differ in their mechanisms and duration of light emission. 
Fluorescence occurs when a substance absorbs light or electromagnetic radiation and quickly 
re-emits it. The emission typically happens almost instantaneously, within nanoseconds, and 
the light emitted has a longer wavelength (lo...
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