[Morphology and Spectral Properties Study of LaCeF3:Tb Microcrystalline].

LaCeF3:Tb microcrystalline was synthesized by microemulsion method, oleic acid-assisted solvothermal method, ultrasonic-assisted solvothermal method separately. LaCeF₃:Tb microcrystalline synthesized by ultrasonic-assisted solvothermal method is rarely reported. Using X-ray diffraction (XRD), scanning electron microscope (SEM), fluorescence spectroscopy (PL) method such as the crystal phase, morphology and luminescence properties of the samples have been characterized. XRD results show that the crystallization product is good, microcrystalline and standard card PDF# 38-0452 (the six-party LaCeF₃) is corresponding, SEM images showing the product has uniform size and morphology, under 250 nm excitation nanoparticlesshows strong green light, the main emission peaks respectively belonged to ⁵D₄-->⁷F₆ (489 nm), ⁵D₄-->⁷F₅ (545 nm), ⁵D₄-->⁷F₄ (585 nm) and ⁵D₄-->⁷F₃ (621 nm) transition of Tb³⁺. Through LaCeF₃ and LaCeF₃:Tb spectral studies prove the existence of the Ce-Tb energy transfer. Calculated the critical doping concentration of Tb in LaCeF₃microcrystalline synthesized by different methods.