Phosphorescence /(?)/

Phos·phor·es·cence

Phosphorescence

n.
  1. The quality or state of being phosphorescent.
  2. The process of phosphorescing, especially that of emitting light after a source of excitation has been removed. This contrasts with the process of fluorescence, in which a substance emits light of a lower wavelength than the illuminating light, only while the illumination continues.
  3. Light emitted by the process of phosphorescence.