Abstract
Self-propagating solution combustion (SC) synthetic method has been used to prepare single-phase Gd4-xAl2O9:xTb3+ (x = 1–6 mol%) powdered samples. Various structural, morphological and optical studies are performed in order to characterize the designated nanocrystalline materials. Phase recognition and refinement parameters of doped phosphors are explored via X-ray diffraction (XRD) assisted Rietveld refinement technique which authenticates that powdered samples are crystallized into monoclinic crystal system having P21c space group. Williamson-Hall (W–H) linearly fitted method along with Scherrer's formula is employed to calculate the average crystallite size of doped materials which are found to be in the domain of nano-range. Transmission electron microscopy (TEM) reveals the presence of non-uniform agglomerated particles with characteristics porosity. The emission profile of all doped samples possesses sharp emission lines centred at 416, 438, 460, 486, 543, 591 and 621 nm due to 5D3 → 7F5, 5D3 → 7F4, 5D3 → 7F3, 5D4 → 7F6, 5D4 → 7F5, 5D4 → 7F4, and 5D4 →7F3 intra-configurational transitions of Tb3+ ion, respectively. The optimized doping concentration of Tb3+ ion for Gd4Al2O9 host is found to be 4 mol%. The resulting chromaticity coordinates (x, y) and high correlated color temperature (CCT) values of doped phosphors endorsed their usage in near ultra-violet NUV energized solid-state display appliances.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
