Synthesis and properties of green phosphor SrGa2S4:Eu2+ for field emission displays by an environmentally clean technique

An environmentally clean synthesis technique is reported for preparing the green phosphor SrGa2S4:Eu2+. This method is based on solid state chemical reactions with the use of raw materials: sodium dimethyldithiocarbomate, tetramethylammonium chloride, gallium nitrate, europium nitrate, strontium sulfide and sulfur. The method is shown to produce powders with quasi-spherical shape, smooth surface morphologies, uniform particle size distribution and high luminous efficiencies (∼20.5 lm/W at 2 kV and 30.8 lm/W at 5 kV).