Self-assembly Synthesis And Application Research Of Rare Earth Fluoride

In this thesis,the fluoride luminescent materials doped rare earth were synthesized by the facile hydrothermal method using NaGdF₄,Ca₅（PO₄）₃F and CeF₃ as host lattices.The concrete contents include following aspects:NaGdF₄:Eu³⁺phosphors have been successfully prepared via the hydrothermal method.The optimum reaction conditions were studied.The as-prepared samples were characterized by XRD,SEM and PL spectra.The results indicated that the optimum molar ratio of Ln³⁺to citric acid was 1:6,the optimum molar ratio of Ln³⁺to fluoride source was 1:12,and the optimum time and pH of the reaction were 24 h and 5,respectively.All the hexagonal phase of the NaGdF₄ samples were synthesized by the different complexing agents（citric acid and sodium citrate）and the different fluoride sources（Na F and NH₄F）.A series of NaGdF₄:Ln³⁺phosphors have been successfully prepared via the citric acid assisted hydrothermal method.NaGdF₄:Eu³⁺,x Li⁺were synthesized,the optimum dopingprepared,the optimum doping concentration of Mn²⁺was 1%.By doping 1%Mn²⁺in NaGdF₄:5%Eu³⁺phosphors,the white emission was achieved.The energy transfer ofThe Ca₅（PO₄）₃F phosphors were prepared via the sodium citrate assisted hydrothermal method.the optimum amount of sodium citrate and phosphoric acid were 2 mmol and 6mmol in Ca₅（PO₄）₃F:Tb³⁺ phosphors,respectively.The energy transfer and color tenability phosphors were prepared by the citric acid assisted hydrothermal method,and the green phosphors were obtained.