A new red colour emitting phosphor - ZnS:Mn co-doped with Ba for electroluminescent (EL) displays
A new Mn activated Ba co-doped ZnS phosphor shows an interesting shift in the spectral emission from amber-yellow (570 nm) to red (620 nm) colour. To realize the phosphor material physics, attempts were made to fine tune the band gap of ZnS by co-doping Ba within the concentration range 2.50-10 mol%. Ba co-doping in ZnS host was achieved by sintering BaSO(4) with ZnS at 900 degrees C by carbothermal reduction method. Measurement of the CIE (Commission International deEchairge) chromaticity colour coordinates (x,y) of Zn(0.99)S:Mn(0.01) and Ba(0.10)Zn(0.89)S:Mn(0.01) phosphors shown to be (0.53, 0.47) and (0.65, 0.32), respectively. (C) 2009 Elsevier B.V. All rights reserved.
phosphor luminescence x-ray diffraction