fluorescence lifetime

Fluorescence lifetime refers to the average time a molecule remains in an excited state after absorbing light before it releases energy and returns to its normal state. When certain substances absorb light, they get energized and emit light of a different color as they relax. The fluorescence lifetime is crucial in fields like biology and materials science, as it helps researchers understand the properties of these substances, track biological processes, and develop technologies like fluorescent markers. Essentially, it measures how long a substance glows after being "charged" by light.