enhancer

https://doi.org/10.1351/goldbook.E02122
A fluorescent compound which accepts energy and thus enhances or promotes the emission from a sample containing a chemically or enzymatically generated excited molecular entity.
See also:
dark photochemistry
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2240 [Terms] [Paper]