Luminescence and energy transfer of single-phase white-emitting phosphor Ba 2 Mg(PO 4 ) 2 :Ce 3+ , Eu 2+ for white LEDs.

A series of Ba 2 Mg(PO 4 ) 2 :Ce 3+ , Eu 2+ phosphors were synthesized by the traditional high temperature solid-state method, and the crystal structures and luminescence properties of the samples were discussed systematically. The energy transfer from Ce 3+ to Eu 2+ in Ba 2 Mg(PO 4 ) 2 was proved to be of resonant type via a dipole-dipole interaction mechanism. With a precisely controlled relative proportion of Ce 3+ /Eu 2+ , the emission color of the samples can vary from blue (0.157, 0.071) to white (0.352, 0.332) and ultimately to yellow (0.452, 0.466) under the 323 nm ultraviolet light radiation excitation. The result reveals that the Ba 2 Mg(PO 4 ) 2 :Ce 3+ , Eu 2+ phosphor may have potential application as a single-phased white-emitting phosphor for light emitting diodes.