Holistic Insight into the Zero Thermal Quenching Novel β-BaB2O4:Ce3+ Phosphor for Optoelectronic Applications

Abstract In this study, we have synthesized novel β-BaB 2 O 4 :xCe 3+ ( x = 0.5, 0.75, 1, 1.25, and 2 mol.%) phosphors using the solid-state reaction method. Upon confirming the formation of the crystalline phase through x-ray diffraction (XRD) analysis, phosphors were optically optimized by examining the excitation spectra at an emission wavelength of 425 nm. For the optimized phosphor, the optical, thermal, and structural properties were thoroughly examined. A comprehensive analysis of diffuse reflectance spectra demonstrated a direct bandgap of 3.19 eV. The temperature-dependent emission showed 100% emission intensity retention up to 483 K, with stable colour coordinates. Temperature-dependent dominant wavelength also showed very little variation between 432.6 nm and 432.8 nm, and the colour purity was found to be nearly 100%. Finally, thermogravimetric analysis (TGA) confirmed the phosphor's exceptional thermal stability, with 98.9 wt.% of the sample remaining stable up to 500 K. In light of all these astonishing characteristics, the proposed phosphor can be further studied for multi-field applications. Graphical Abstract