The deactivation of the primarily excited emitter which can lead to the activation of the quencher followed by radiative deactivation.
Source:
PAC, 1984, 56, 231. 'Nomenclature, symbols, units and their usage in spectrochemical analysis-Part VI: molecular luminescence spectroscopy' on page 235 (https://doi.org/10.1351/pac198456020231)