lumiphore (luminophore)

https://doi.org/10.1351/goldbook.L03649
A part of a molecular entity (or atom or group of atoms) in which electronic excitation associated with a given emission band is approximately localized. (Analogous to @C01076@ for absorption spectra).
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2253 [Terms] [Paper]