Physical insights into crystal structure and optical response of green light emitting Tb3+ activated GdSr2AlO5 nanophosphors for optical displays

Abstract

Pure single phasic cool green light emitting Tb3+ activated GdSr2AlO5 nanophosphors have been synthesized via effective gel-combustion method which comprise the precursor synthesis and post treatment at 1350 °C. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX) spectroscopy, elemental mapping, photoluminescence, decay life time and quantum efficiency and CIE color coordinates with color purity and color coordinate temperature (CCT) has been employed to characterize fabricated nanomaterial. Diffraction exploration confirms tetragonal crystal formation of fabricated nanomaterials with space group of I4/mcm. TEM micrograph confirms the nano sized of the particles. The occurrence of efficient energy transfer between Gd3+ and Tb3+ results an additional strongest excitation band at 273 nm which resembles to 8S7/2→6I11/2 f–f transition of Gd3+ ion. The PL spectra of GdSr2AlO5:Tb3+nanophosphors are governed by 5D4→7FJ (J = 3, 4, 5, 6) transitions of trivalent terbium ions in materials and most strong band is recorded at 548 nm with 5D4→7F5 transition which answerable for the green color of synthesized materials. The decay exploration demonstrates that lifetime values decrease with Tb3+ content. Colorimetric investigation of Gd1-xSr2AlO5:xTb3+ (x = 1–7 mol%) nanophosphors significantly suggest the utilization of focused work in optical display areas and other lighting foundations.