Synthesis, characterization and spectroscopic properties of some rare earth activated LiAlO2 phosphor

The current paper comprises the synthesis of LiAlO2 phosphor doped with rare-earth elements Tb3+, Eu3+, and Dy3+ by microwave-assisted solution combustion synthesis method (SCS) and the spectroscopic properties were examined. The phosphors samples were identified and characterized by XRD, FT-IR, thermo-gravimetric analysis TG-DTA and SEM. All the prepared phosphors show polycrystalline nature with a grain size of about 49 nm as confirmed from XRD and SEM. Photoluminescence excitation and emission spectrum of Tb3+, Eu3+, and Dy3+ doped LiAlO2 with different sintering temperature and concentration of dopants were investigated. The Dy3+ shows the strongest blue emission peak at 484 nm corresponding to the transition F-4(9/2) to H-6(15/2) under UV excitation of 358 nm. The Eu3+ doped LiAlO2 phosphor shows emission peak 591 nm to 615 nm for UV excitation of 238 nm which arise due to D-5(0) to F-7(1) electric dipole transitions. The Tb3+ doped phosphor shows a broad excitation peak centered at 238 nm whereas it exhibits an emission peak at 544 nm corresponding to the peak transition (D4-F6)-D-5-F-7 under the UV excitation at 238 nm.

Automated summary

The current paper synthesized LiAlO2 phosphor doped with rare-earth elements Tb3+, Eu3+, and Dy3+ using microwave-assisted solution combustion synthesis method and studied their spectroscopic properties through XRD, FT-IR, TG-DTA, and SEM. The photoluminescence excitation and emission spectrum of the doped phosphors were investigated under different sintering temperatures and dopant concentrations. The results showed unique emission peaks for each dopant under specific excitation conditions.