phos·pho·res·cence 
(fŏs′fə-rĕsəns)
(fŏs′fə-rĕsəns)n.
1. Persistent emission of light following exposure to and removal of incident radiation.
2. Emission of light without appreciable heat, as from chemiluminescence of phosphorus or bioluminescence of living organisms.
phos′pho·rescent adj.
phos′pho·rescent·ly adv.