Abstrait

Luminescent studies of rare earths doped SrS phosphor

Sayana K R , P.Indira ,K. V. R. Murthy

The present paper reports the photoluminescence (PL) of rare earth ions (RE-Eu,Ce and Eu,Ce,Ga) doped SrS phosphor. The phosphors were synthesized by standard solid-state reaction method under carbon reduction atmosphere and the starting materials are grounded by using mortar and pestle, and these materials heated at 900oC for 90 minutes in a muffle furnace. The formation of crystalline size of SrS phase was evident by the X-ray diffraction analysis of the fired products. The crystallite size of the samples was measured using XRD patterns and found as 69.13nm and 63.68nm respectively. The effects of doping concentrations on luminescent properties of phosphors are investigated, the photoluminescence (PL) excitation spectra of the phosphors are investigated monitoring at 600nm. The emission spectrum of SrS:Eu(0.5%),Ce(0.5%) and SrS:Eu(0.5%),Ce(0.5%),Ga(0.5%) are taken for different excitation wavelengths like 254,262,274,450,470,490,520 and 540nm, It is observed broadband which can be viewed as the typical emission of Eu2+ ascribed to the 4f–5d transitions. Because of their broadband absorption in the region 400–630 nm, The Photoluminescence properties of the materials were studied using Spectrofluorophotometer at room temperature. The Infrared spectra for the prepared solid nanopowders were recorded in the range between 400 and 4000 cm-1 on a Fourier transform spectrometer. The particle morphology of the product was characterized by SEM and particle size analysis.