Synthesis and photoluminescence studies on YAl₃(BO₃)₄:Tb³⁺phosphor

Abstract

Terbium (Tb3+) doped yttrium aluminium borate phosphors (YAl3(BO3)4) with different compositions such as YAl3(BO3)4:Tb3+, Y1−xAl3(BO3)4:Tbx3+ and YAl(3−x)(BO3)4:Tbx3+ (x = 1−8 mol.%) were synthesized using modified solid state reaction technique. The synthesized phosphor was studied using powder X-ray diffraction analysis (XRD), photoluminescence spectroscopy (PL), high resolution-scanning electron microscope (HR-SEM). Lattice parameters are calculated for the Tb3+ doped and substituted YAB phosphors using XRD analysis. The phosphor exhibits green emission at 572 nm with 375 nm of excitation. It is found that the Tb3+ ions substitution in the sites Y3+ and Al3+ ions in Y1–xAl3(BO3)4:Tbx3+ and YAl(3–x)(BO3)4:Tbx3+ leads to overlapping of energy levels which affects the PL intensity of the phosphor significantly. Thus, phosphor synthesized with the composition YAl3(BO3)4:Tb3+, acquires higher photoluminescence (PL) intensity when compared to Y1–xAl3(BO3)4:Tbx3+ and YAl(3–x)(BO3)4:Tbx3+ phosphors. Temperature dependent PL property (thermal quenching studies) of YAl3(BO3)4:Tb3+ was also performed up to 250 °C. Further, it is found that the PL intensity of the studied phosphor is comparable with commercial green phosphor. HR-SEM analysis demonstrates that the phosphors are grown as nanorods with an average diameter of 50–80 nm and length 250–500 nm.