| 초록 |
Recently, to investigate the energy transfer pathways and achieve high amplification gain in organic lanthanide complex, we have systematically designed and synthesized the highly efficient light-harvesting integrated supramolecular materials based on naphthalene and anthracene derivatives with aryl-ether dendrons, which provide enough coordinated sites for the formation of inert, stable 9-coordinated lanthanide complex. Lanthanide ions were encapsulated with two types of the naphthalene-based luminescent ligands. One of them can lead to the direct formation of luminescent lanthanide complexes without a molecular spacer and the other can render the indirect formation of luminescent lanthanide complexes through a molecular spacer as a building block. The emission spectra of these 9-coordinated Eu3+ complexes contain an intra 4f electronic transition from the first excited state (5D0) to the ground state (7F2) at 612 nm. The main pathways of energy transfer from the luminescent ligands to the lanthanide ions were investigated. All Er3+ complexes showed strong near-IR emission peaks at 1.53 μm. The luminescence originated from the first excited state (4I13/2) to the ground state (4I15/2) transition of the partially filled 4f shell. The full width at half maximum (FWHM) of all spectra is 75 nm. The emission intensity of lanthanide complexes is dramatically increased with decreasing temperature, due to the restraint of the thermal relaxation decay. In this presentation, the synthesis and photophysical properties of the highly efficient light-harvesting integrated supramolecular materials will be discussed. |
