Emission analysis of Li6LuY(BO3)3:Tb3+,Dy3+ phosphors

• Li6LuY(BO3)3:Tb3+,Dy3+ phosphors were synthesized by solid state reaction method.
• The concentrations of the activators were optimized for Li6LuY(BO3)3:Tb3+,Dy3+.
• Chromaticity analysis confirmed that Dy3+ emission contributes white emission.
• Decay time components obtained are 2.5 ms and 0.8 ms for Tb3+ and Dy3+, respectively.

In this paper, we present the synthesis and luminescence properties of Tb3+ and Dy3+-doped lithium lutetium yttrium borate (Li6LuY(BO3)3) phosphors. We have adopted the well-known solid state reaction method for the synthesis of these phosphors. The emission intensities of the synthesized phosphors were found to reach their maximum, when doped by 1 mol% of Tb3+ and 3 mol% of Dy3+, beyond which emission intensities decrease due to concentration quenching. The homogeneous phase, crystalline structure and uniform morphology of the synthesized phosphors were confirmed by X-ray diffraction analysis (XRD) and Scanning electron microscopy (SEM). The X-ray and UV–VIS-induced luminescence, decay time and CIE chromaticity were investigated for the synthesized phosphors.The X-ray induced integrated light yield was measured to be 82% for Li6LuY(BO3)3:Tb3+ (LLYBO) and 59% for Li6LuY(BO3)3:Dy3+ of that of commercially available X-ray imaging material; Gd2O2S:Tb3+ (Gadox).LLYBO:Tb3+ phosphor displayed five major emission bands that correspond to 5Dj → 7Fj transitions. The 1931 Commission Internationale de l'Eclairage (CIE) chromaticity coordinates were also measured.