Investigation on concentration-dependent luminescence properties of high color purity red-emitting Pr³⁺ ion-doped sodium barium borate phosphors

The photoluminescence studies were carried out for Pr³⁺ ion-doped NaBaB₉o₁₅ phosphors by varying Pr³⁺ ion concentrations. The formation of single-phase was confirmed through X-Ray diffraction analysis. FTIR analysis was made to identify functional groups presented in the studied phosphors. The morphology of synthesized phosphors was examined through SEM analysis. As-prepared NaBaB₉O₁₅:xPr³⁺ phosphors exhibit strong red emission peak with FWHM of 14 nm under blue excitation. In the studied phosphors, optimum dopant (Pr³⁺ ions) concentration was found as 4 mol%. The CIE method was employed to find dominant giving out color of prepared phosphors. The color coordinates are passed through red region of CIE diagram and hence, the studied NBB:xPr³⁺ phosphors have the ability to emit intense red color under blue excitation. Decay measurements are made to determine the fluorescent lifetime values of ¹D₂ excited level of Pr³⁺ ions and the decay curves are well fitted to non-exponential curve fitting method. All the measurements were done as a function of Pr³⁺ ion concentration at room temperature and the results were compared with similar literature results.