Fluorescence quenching is a process where the fluorescence of a molecule is reduced or extinguished, often due to interactions with other molecules, such as oxygen. In artificial photosynthesis, understanding fluorescence quenching is crucial for optimizing light absorption and energy conversion efficiency. Molecular oxygen, being a strong quencher, plays a significant role in studying the dynamics of energy transfer in photosynthetic systems. The discussion emphasizes the need for clarity on the definitions of fluorescence quenching and artificial photosynthesis to facilitate deeper understanding. Overall, the relationship between fluorescence quenching and artificial photosynthesis is essential for advancing research in energy conversion technologies.