The change of phosphorescent property with chemical modification and co-doping of Nd as an auxiliary activator in CaAl$_2$$O_4$: Euulcorner, Ndulcorner phosphor, employing Ndulcornerion(0.6%) and an co-activator maintained its afterglow for 4.5 hours. And also the initial persistent brightness and phosphorescent property were further improved both by substituting Al by B atoms and incorporation of Ndulcorner ion. It was found that the persistent time was 30 hours for&Ca(Al_{0.97};B_{0.03}) $_2$$O_4$:EUulcorner(0.3%), Ndulcorner(0.6%) phosphor.