Synthesis and luminescent characterization of zinc thiogallate

Eu doped zinc thiogallate, ZnGa2S4:Eu2+, powders were prepared by solid state reaction process at H2 atmosphere by introducing extra S vapor to compensate for the evaporation loss of S. A single phase ZnGa2S4:Eu2+ could be obtained by firing above 850 °C for 3 h at 5% H2 atmosphere. It exhibited a green emission band at 540 nm with an excitation wavelength of 465 nm that could be emitted from commercial blue LEDs. The maximum emission intensity could be achieved from 4 mol% Eu2+ doped ZnGa2S4 phosphors.