| 초록 |
The Er 3+ ion shows an intra 4f shell transition from its first excited state to the ground state, which occurs at a wavelength of 1.54 μm. These optical transitions are rather sharp, and the luminescence lifetime can be as long as several milliseconds. These properties make them to use optical amplifiers applications. However, lanthanide cations have the poor solubility in conventional inorganic/organic media. To avoid this solubility problem and improve the optical properties, the Er 3+ ion can be encapsulated by an organic ligands. So, we have designed and synthesized lanthanide (Er)-chelated complexes based on porphyrin-cored aryl ether dendrimers. We synthesize a series of porphyrin-cored aryl-ether dendrimers (GnTPPH2, GnTPPZn. n=1-4) by convergent synthetic approaches. And, we have measured the absorption and emission spectroscopies using different solvents to investigate optical property according to solvent polarity. Also, we have synthesized lanthanide (Er)-chelated dendritic complexes using prepared aryl ether dendrimers. In this presentation, we will discuss synthesis and photophysical studies of the lanthanide (Er)-chelated complexes based on porphyrin-cored aryl ether dendrimers. |
