Colour control in SrS:Cu,Cl powder phosphor

By controlling the concentration of defects and their type in strontium sulphide phosphor, a broad range of colours in the visible spectrum can be achieved. Photoluminescence (PL) spectrum in the blue to green range of SrS:Cu,Cl is presented and explained on the basis of charge compensation process and coordination about the Cu+ ion. Analysis of lattice parameter, strain and grain size were carried out on the basis of X-ray diffraction (XRD) data. From the study of diffuse reflectance spectra (DRS), red-shift in band-gap was observed with increasing doping concentration, which is due to the presence of doping induced tail states.

Photoluminescence spectrum of SrS:Cu,Cl phosphor for different Cu concentrations at 300 K, λex = 310 nm. Emission colour varies from blue to red as the doping concentration is increased.Figure optionsDownload as PowerPoint slideHighlights
► We report the study of the effect of doping concentration on the lattice parameter, band gap and photoluminescence in SrS:Cu,Cl phosphor.
► Analysis of the observations were made by comparison with previous reported results.
► Emission colour in SrS:Cu,Cl phosphor can be tailored from blue to green on increasing the doping concentration.
► Band gap is red shifted with doping concentration due to band tailing effects.
► Analysis of lattice parameter, strain and grain size are carried out on the basis of X-ray diffraction (XRD) data.