inner filter effect 

https://doi.org/10.1351/goldbook.I03047
  1. In an emission experiment, an apparent decrease in emission quantum yield and/or distortion of bandshape as a result of reabsorption of emitted radiation.
  2. During a light irradiation experiment, absorption of incident radiation by a species other than the intended primary absorber.
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2247 [Terms] [Paper]
Citation: 'inner filter effect' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.I03047 RIS BibTex EndNote
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Last revised: February 24, 2014