The well-known solid-state reaction method is used for the synthesis of Tb doped LuGd2Ga2Al3O12 phosphor. XRD and SEM techniques are used for the phase and structural morphology of the synthesized phosphor. UV, X-ray and proton induced spectroscopy is used to study the luminescence properties. LuGd2Ga2Al3O12:Tb3+ phosphor shows its highest peak in green and blue region. The two major emission peaks correspond to 5D3→7FJ (at 480 to 510 nm, blue region) and 5D4→7FJ (at 535 to 565 nm, green region). Green emission is dominant; therefore, it may be used as an efficient green phosphor. The absorption spectra of the synthesized material matches well with the spectra of light emitting diodes (LEDs); therefore, it may have applications in LEDs. X-ray spectroscopic study suggests that this phosphor may have uses in medical applications, such as X-ray imaging. The synthesized phosphor exhibits 81% efficacy in comparison to the commercial plasma display panel material (Gd2O2S:Tb3+). The Commission Internationale de l’Eclairage (CIE) chromaticity diagram is obtained for this phosphor. The decay time of ms range is measured for the synthesized phosphor.
This work presents the synthesis of Li6YGd(BO3)3:Tb3+,Dy3+ (Lithium yttrium gadolinium borate) phosphors and characterization of their luminescence properties. The solid state reaction method was adopted for the synthesis of these phosphors. These phosphors were optimized for the activators' concentrations i.e., 1.5 mol% for Tb3+ and 3 mol% for Dy3+. The homogeneous phase, uniform crystalline structure and overall uniform morphology of the synthesized phosphors were confirmed by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). The X-ray and ultraviolet-visible induced luminescence were measured. Several emission spectra were observed for these phosphors. The phosphors were characterized for X-ray induced integrated light yield and was found to be 60% for Li6YGd(BO3)3:Tb3+and 47% for Li6YGd(BO3)3:Dy3+ of that of commercially available X-ray imaging material Gd2O2S:Tb3+ (Gadox). The UV-induced integrated light yield of both Li6YGd(BO3)3:Tb3+,Dy3+ phosphors were measured to be 78% and 42% of commercial grade PDP material (Y,Gd)2O3:Eu3+), respectively. The 1931 Commission Internationale de l'Eclairage (CIE) chromaticity coordinates were also measured for the synthesized phosphors.
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