Molecular Design, Synthesis and Luminescent Properties of Erbium(III)-Cored Supramolecular Complexes Based on Metallopor
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Molecular Design, Synthesis and Luminescent Properties of Erbium(III)-Cored Supramolecular Complexes Based on Metalloporphyrins for Optical Amplification Jae Buem Oh, Kyung Lim Paik, Jae-Won Ka, Soo-Gyun Roh, Min Kook Nah and Hwan Kyu Kim* Center for Smart Light-Harvesting Materials and Department of Polymer Science & Engineering, Hannam University, Daejeon 306-79l, Korea; *Email: [email protected]/ ABSTRACT
We have investigated the development of erbium(III)-cored supramolecular complexes containing metalloporphyrins to circumvent the solubility problem and improve the optical amplification property. The new synthetic methodology was accomplished through the ligand-exchange model reaction using ErCl3 to optimize its synthetic condition We have designed and synthesized the model complexes to investigate coordination property between the ligand and the erbium ion. Highly coordinated erbium(III)-cored model complexes (at least 8 to 10 coordination) showed the strong near infrared(IR) emission at 1520 nm, corresponding to the 4 I13/2 → 4I15/2 transition. Also, with these synthetic results, erbium(III)-cored supramolecular complexes based on metalloporphyrins were synthesized and characterized. They also showed the infrared emission of the 4I13/2 → 4I15/2 transition at 1520 nm.
INTRODUCTION To achieve the superhigh speed telecommunication systems, the development of integrated planar waveguide optical amplifiers is extremely essential [1]. In particular, integrated optical amplifier wavelength division multiplexing (WDM) devices are recognized to be essential for successfully realizing photonic devices in WDM technology, which has attracted much attention because of its paramount importance in superhigh speed communication systems. Despite such needs, the problem still remains to be in the materials for the use in the real optical amplifiers. At present, Er(III)-doped silica amplifiers are widely used. But, the poor solubility of lanthanide cations (Ln3+) in conventional inorganic/organic media leads to the low amplification property. When the higher doping concentration of lanthanide cations was introduced, clustered Ln3+ species can be formed, which in turn has limited the amplification property. It is ascribed to the cooperative energy- transfer processes (i.e., self-quenching process) between the clustered Ln3+ species. Their processes reduced the intensity of luminescence. To circumvent the solubility problem and maximize the optical amplification property, we have investigated and developed lanthanide-cored supramolecular complexes containing porphyrin derivatives. They were designed to enhance the luminescent intensities by occurring an efficient energy transfer process from a certain organic ligand to a lanthanide ion. We used porphyrin ligands as organic ligands to encapsulate the erbium ion and realize the efficient energy transfer process from a porphyrin ligand to a central metal ion. Also, the cooperative energy-transfer processes between the clustered Ln3+ species were avoided through si
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