Quencher

{
  "id": "MLC-T-CHM-009781",
  "term": "Quencher",
  "field": "Chemistry",
  "definition": "A chemical species that reduces the intensity of fluorescence or phosphorescence from an excited molecule without necessarily undergoing a chemical reaction itself. This process, known as quenching, involves non-radiative energy transfer or electron transfer from the excited state of the fluorophore to the quencher. Common quenchers include oxygen, iodide ions, and certain heavy atoms, which can significantly decrease the fluorescence lifetime.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "Stern-Volmer kinetic relationships",
    "electron transfer",
    "excited state",
    "quenching"
  ],
  "references": [
    "PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2268 (https://doi.org/10.1351/pac199668122223)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/quencher/"
}