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Abstract
Series of Gd3+ doped alkaline earth octaborate phosphors with the general formula MxBa1-xB₈O₁₃: 2% Gd³⁺ (M = Ca²⁺, Mg²⁺; x = 0.10) were synthesized through a solid state method to investigate the influence of alkaline earth ions on the structural, optical, and luminescence properties of the BaB8O13 host material. X-ray diffraction (XRD) confirmed the formation of orthorhombic BaB8O13 showing that the main structure was not influence by the concentration of Ca2+ and Mg2+ but peak shifts and lattice deformation due to the substitution of Ca2+ and Mg2+ ions was observe. Scanning Electron Microscopy (SEM) was perfomed to study the surface morphology, while Energy Dispersive X-ray Spectroscopy (EDS) confirmed elemental composition of the materials. UV-Vis diffuse reflectance spectra and Tauc plot analysis display a narrow bandgap after doping with Gd3+ ions, suggesting change in electronic transitions and an increased defect levels. Photoluminescence (PL) measurements revealed characteristic emissions of Gd3+ under excitation wavelength of 274 nm, with prominent emission intensity at 313 nm wavelength upon doping with Ca²⁺ ions. The observed enhancements are properties to improved energy transfer efficiency around the Gd³⁺ ions, while upon doping with Mg2+ decreased the luminescence intensity and this is due to quenching which led to higher probability of non-radiative energy transfer between Mg2+ ions. These findings prove that controlled substitution with alkaline earth metals can effectively modify the luminescence properties of Gd3+ activated BaB8O13 phosphors, making them promising candidate for phototherapy applications.
| Apply for student award at which level: | MSc |
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| Consent on use of personal information: Abstract Submission | Yes, I ACCEPT |