An optical physicist who studied luminescence, including its quenching by impurities and concentration changes. His distinction between persistent excited-state emission and other light-generation mechanisms helped frame the analysis of radiation observed by Pavel Cherenkov. Measuring how emission changes with its environment thus served both as a probe of excited matter and as a way to distinguish different physical sources of light.[ref]
Sergey Ivanovich Vavilov by Russian Academy of Sciences. Scientific-work account: quenching, definition of luminescence and Cherenkov investigations
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Sergey Vavilov may refer to multiple individuals, but one prominent figure with that name is a prominent Russian physicist known for his contributions to optics and laser technology. He was part of significant developments in the 20th century and made contributions to scientific research and education.