Synthesis And Characterization Of Rare Earth Erbium Organic Complex With Near-infrared Optical Property

Erbium(Er³⁺) ion possessed excellent research and application value owing to its near-infrared photoluminesence at wavelength of 1.54μm which matched the optical communication operation wave band. Erbium complexes co-doped polymer had drawn much attention for the merit that it had combined both organic comlexes (large absorption cross section and good compatibility with polymer) and inorganic Er³⁺ (narrow fluorescence emission and long fluorescence lifetime).In this paper, we synthesized double-core erbium organic complexes via the coordination of organic carboxylic acid and Er³⁺. Molecular structure had been determined by FT-IR, UV-Vis-NIR spectrum and Elemental Analysis;The relation between coordination situation and luminescence property had been taken by UV-Vis-NIR spectrum and Luminescence Spectrum;Through DSC and TGA analyses, the rare earth complexes showed good thermal stability. We found that the preparation of this kind of complexes had great relationship with experiment conditions(for instance pH value,chosen and dose of solvent).The doped concentration of the complexed had been much higher increased and meanwhile Er³⁺ had been uniformly dispersed that reduced probability of quench because of the special double-core structure.Chose the suitable ligand which had energy level matching structure could enhance luminescence property effectively.We had obtained relatively strong emission at near-infrared wave band (1.54μm) under th excitation of wavelength 980nm pumping ray.At the same time a sort of rare earth erbium complexes containing dualistic aromatic carboxylic acid which had well near-infrared luminescence property and perfect water-solubility was gained.After the addition of ytterbium emission quality of the complexes was improved which indicated the existence of energy transmission between erbium and ytterbium.The research of rare earth complexes possessing excellent near-infrared fluorescence property was to the well basic for the next step that preparation of rare earth complexes doped near- infrared materials of eminent integration characteristics.