Synthesis and Photophysical Properties of Luminescent Erbium(III) Complexes Based on Coumarin Derivatives for Advanced Photonics Applications

摘要

The luminescent, Er(III)-chelated complexes based on coumarin derivatives such as coumarin-3-carboxylic acid and coumarin 343 were, prepared by ligand-exchange read ion in the presence of ErCl_3 and potassium coumarin derivative sails. The chemical structures of the present complexes were confirmed by elementary analysis, thermal gravimetric analysis. FT-IR, absorption and emission spectroscopies. The coumarin-based Er(III) complexes exhibited the near IR emission, corresponding to the characteristic. ~4I_(13/2)- >~4I_(15/2) transition of Trivatenl, erbium ions, taking place in the region of 1512 or 1530nm. Their PL intensity also depends on the degree of the spectral overlap between lite emission band of coumarin derivative and the absorption band of Er ion.