| Abstract: |
The development of advanced luminescent materials for high-performance display devices has gained significant attention in recent decades. Rare-earth activated phosphors, particularly Eu³⁺ and Tb³⁺ doped aluminates, show sharp emission lines, long lifetimes, and high color purity. Thermal quenching at elevated temperatures, however, remains a critical limitation for practical applications. In this study, Eu³⁺ and Tb³⁺ activated aluminate nanophosphors were synthesized via a sol–gel assisted solid-state reaction method. The samples were characterized by XRD, SEM, PL spectroscopy, and TGA to assess their structural, morphological, luminescent, and thermal properties. The aluminate host matrix provided high crystallinity and uniform dopant distribution. Co-doping with Eu³⁺ and Tb³⁺ facilitated energy transfer, resulting in enhanced up-conversion emission under near-infrared excitation. Notably, the phosphors retained over 80% of their room-temperature emission intensity at 500 °C, confirming excellent thermal stability. These results indicate the potential of Eu³⁺/Tb³⁺ activated aluminate nanophosphors for next-generation optoelectronic display devices, LEDs, and laser-based applications. |
