APPLIED RADIATION AND ISOTOPES, vol.203, pp.1-6, 2024 (SCI-Expanded)
In the MgO–Al2O3 system, magnesium aluminate spinel (MgAl2O4) is a technologically significant compound due
to its unique properties, including a high melting point, low thermal conductivity, excellent thermal shock
resistance, chemical inertness, and robust mechanical strength. This compound has diverse applications in refractory materials, catalyst supports, moisture sensors, nuclear techniques, insulating materials, and even military applications. While rare-earth elements are commonly used as dopants in luminescent materials, limited
research exists on doping of Tb3+ ions in magnesium aluminate. This study investigates the luminescence
properties of Tb3+ doped synthesis magnesium aluminate materials, shedding light on this underexplored area.
The combustion method is employed for synthesis, known for producing nano-sized powders with exceptional
luminescent properties. Additionally, this study explores Sm3+ ion doping in magnesium aluminate materials and
their luminescence properties. Using the combustion synthesis method, structural attributes of Tb3+− doped
MgAl2O4 nanophosphors are meticulously examined. Through X-ray diffraction (XRD) and Fourier-transform
infrared (FTIR) analyses, coupled with excitation and emission spectra, a comprehensive investigation of the
luminescent provide behavior at room temperature is provided. The XRD data reveal Tb3+ doped MgAl2O4
phosphors exhibit a single phase with face centred cubic structure belonging to the Fd3 m space group, consistent
with the standard JCPDS files (No. 21–1152). Excitation and emission spectra offer valuable insights into the
energy transitions within the Tb3+− doped MgAl2O4 phosphors. Furthermore, the study explores the effects of
varying Tb3+ ion concentrations on the luminescent properties, revealing an optimal doping concentration of 5
wt% Tb for maximizing emission intensity. Concentration quenching, primarily attributed to dipole-dipole (d-q)
interactions, is observed at higher Sm3+ concentrations. In conclusion, this research enhances our understanding
of rare-earth ion doping in luminescent materials and highlights the potential applications of Tb3+− doped
MgAl2O4 nanophosphors, which offer promise for various technological applications, including lighting and
displays.