aluminates and lanthanum and lanthanum magnesium borates activated with pr 3 and mn 2 exhibit characteristics of quantum splitting phosphors improved quantum efficiency may be obtained by further doping with gd 3 refined rules for designing quantum splitting phosphors include the requirement of incorporation of gd 3 and mn 2 in the host lattice for facilitation of energy migration application_number US 68166601 A description in general the present invention provides oxide based phosphors activated with pr 3 and mn 2 more particularly the phosphors are strontium aluminate and lanthanum borate phosphors activated with at least pr 3 and mn 2 ions the doping level for pr 3 and mn 2 are typically in the range from about 0 005 to about 0 1 and from about 0 005 to about 0 5 respectively in addition the strontium ions of the aluminate phosphors of the present invention may be substituted partially or completely by calcium in one preferred embodiment of the present invention the aluminate phosphor is further doped with gadolinium the preferred doping level for gd 3 is in the range from about 0 005 to about 0 995 depending on the host lattice in another preferred embodiment of the present invention the aluminate phosphor is further doped with la 3 and mg 2 at sufficient levels for charge compensation and for minimization of the number of vacancies in the lattice thus the aluminate phosphors have a formula of sr 1 u2212 x ca x al 12 o 19 pr 3 mn 2 or sr 1 u2212 x ca x al 12 o 19 pr 3 mn 2 a where 0 u2266 x u2266 1 and a is at least one selected from the group consisting of.