Enhancement of the luminescence properties of Sr 3 (PO 4 ) 2 :Dy 3+ ,Li + white-light-emitting phosphors by charge compensator Li + co-doping.

Sr3 (PO4 )2 :Dy3+ ,Li+ phosphors were prepared using a simple high temperature solid method for luminescence enhancement. The structures of the as-prepared samples agreed well with the standard phase of Sr3 (PO4 )2 , even when Dy3+ and Li+ were introduced. Under ultraviolet excitation at 350 nm, the Sr3 (PO4 )2 :Dy3+ sample exhibited two emission peaks at 483 nm and 580 nm, which were due to the 4 F9/2  → 6 H15/2 and 4 F9/2  → 6 H13/2 transitions of Dy3+ ions, respectively. A white light was fabricated using these two emissions from the Sr3 (PO4 )2 :Dy3+ phosphors. The luminescence properties of Sr3 (PO4 )2 :Dy3+ ,Li+ phosphors, including emission intensity and decay time, were improved remarkably with the addition of Li+ as the charge compensator, which would promote their application in near-ultraviolet excited white-light-emitting diodes.