Preparation of green-emitting Sr1-xEuxGa2S4 phosphors by a solid-state rapid metathesis reaction

Fine-particle-size (1-2 mu m), europium-activated strontium thiogallate pho sphors, Sr1-xEuxGa2S4, have been synthesized by a novel, solid-state, rapid metathesis reaction with metal chloride and sodium sulfide precursor powde rs. The reaction was initiated in an agate crucible with a heated tungsten filament in a glove box. The resultant powders were weakly crystalline and not luminescent in the as-synthesized state. Subsequent heat-treatment in a N-2 atmosphere for 4 h at 750 degrees C fully crystallized the powders and produced the characteristic photoluminescence broad-band emission centered at 535 nm of Sr1-xEuxGa2S4. (C) 1999 The Electrochemical Society. S0013-46 51(99)01-007-1. All rights reserved.