Synthesis of La₂Ce₂O₇: Eu³⁺ by sol-gel method and its photoluminescence properties

Red phosphorsof the La₂Ce₂O₇:Eu³⁺ were synthesized by sol-gel method. The effects of calcination temperature, Eu³⁺ doping concentration and different kinds of charge compensations on the luminescent properties were also studied in this paper. The crystal structure, surface morphology and luminescent properties of the samples were measured and characterized by XRD, SEM, and fluorescence spectrum. The results show that the main crystal phase of samples is La₂Ce₂O₇, which is single-phased fluorite structure.Its crystal structure has not been changed by Eu³⁺ion and charge compensations. Under the blue light excitation of 467 nm, the characteristic red emission at 612 nm is detected. The emission intensity increases and then decreases with the increasing of the sintering temperature and Eu³⁺ ion concentration. The optimum sintering temperature and Eu³⁺ ion concentrationare 1 100 ℃ and 10 mol%, respectively. The emission intensity could be enhanced efficiently by doping charge compensations and the best luminescent performance could be derived when the sample is co-doped with Li⁺ ion.