phos·pho·resce 
(fŏs′fə-rĕs)
(fŏs′fə-rĕs)intr.v. phos·pho·resced, phos·pho·resc·ing, phos·pho·resc·es
To persist in emitting light, unaccompanied by sensible heat or combustion, after exposure to and removal of a source of radiation.
[Probably back-formation from PHOSPHORESCENT.]