Blue-green tunable color of Ce(3+)/Tb(3+) coactivated NaBa(3)La(3)Si(6)O(20) phosphor via energy transfer

A series of color tunable phosphors NaBa(3)La(3)Si(6)O(20):Ce(3+), Tb(3+) were synthesized via the high-temperature solid-state method. NaBa(3)La(3)Si(6)O(20) crystallizes in noncentrosymmetric space group Ama2 with the cell parameters of a = 14.9226(4) Å, b = 24.5215(5) Å and c = 5.6241(2) Å by the Rietveld refinement method. The Ce(3+) ions doped NaBa(3)La(3)Si(6)O(20) phosphors have a strong absorption band from 260 to 360 nm and show near ultraviolet emission light centered at 378 nm. The Ce(3+) and Tb(3+) ions coactivated phosphors exhibit color tunable emission light from deep blue to green by adjusting the concentration of the Tb(3+) ions. An energy transfer of Ce(3+) → Tb(3+) investigated by the photoluminescence properties and lifetime decay, is demonstrated to be dipole–quadrupole interaction. These results indicate the NaBa(3)La(3)Si(6)O(20):Ce(3+), Tb(3+) phosphors can be considered as potential candidates for blue-green components for white light emitting diodes.