Luminophore
In chemistry and materials science, a luminophore is the part of a molecule, coordination complex, or solid-state material that is responsible for its luminescence (light emission following excitation). In molecular photochemistry, the closely related IUPAC-recommended term lumiphore refers to "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", by analogy with chromophore for absorption.