Study On Preparation Of Organic Light Conversion Agent Containing Rare Earth Ions

In this paper,rare earth europium as the center of light-emitting ions,ophenanthroline as organic ligands,SiO₂ as inorganic carrier,coprecipitation synthesis of rare earth organic conversion agent Eu-Phen/SiO₂.The effects of preparation conditions on the fluorescence properties were investigated.?IR?,X-ray diffraction?XRD?,fluorescence spectroscopy?PL?,thermogravimetry?TG?and other modern instruments.The results showed that the optimum conditions for the preparation of Eu-Phen/SiO₂ were temperature40 ?,the particle size of silica was 2.6?m,the ratio of Eu3+:SiO₂ = 1:6.2,reaction time30 min,molar ratio Eu3+:Phen = 1:2.Infrared analysis shows that the N atom in the phenanthroline forms a coordination bond with the rare earth ions.XRD shows that the complex Eu-Phen is supported on the surface of the silica.Fluorescence analysis showed that the peak of red complex was 616 nm,which belongs to 5D0 ? 7F2 transition.The thermal stability of the complex Eu-Phen/Si O2 was measured by thermogravimetric analysis.Doped Yb³⁺,Er³⁺,La³⁺ on the basis of the rare earth transition agent Eu-Phen/SiO₂,and the rare earth organic conversion agent.The effect of preparation conditions on the fluorescence properties was studied by using La³⁺as the dopant ion.?IR?,X-ray diffraction?XRD?,fluorescence spectroscopy?PL?,thermogravimetry?TG?and other modern instruments.The results show that the optimum conditions for the preparation of Eu-LaPhen/SiO₂ are temperature 40 ?,silica particle size 5.5?m,reaction time 60 min,molar ratio?0.4Eu + 0.6La?Phen = 1:2.The infrared analysis shows that the rare earth ions doped with different phenanthrene are different from those of phenanthroline.The coordination bond formed by Yb³⁺is the strongest,which may be close to the radius of the central luminescent ion.XRD shows that the complex Eu-Yb-Phen is supported on the surface of the silica.Fluorescence analysis showed that the peak of red complex was616 nm,which belongs to5D0?7F2 transition.The thermal stability of the complex Eu-YbPhen/SiO₂ was measured by thermogravimetric analysis.The degree of sensitization of different ions was Yb³⁺> La³⁺> Er³⁺ by infrared spectroscopy and fluorescence spectroscopy.