New Strategies in Designing Advanced Luminescent Molecules
소속 :
연사 : Prof. Soo-Young Park (Seoul National University, Dept. of Materials Science)
일시 : 2011-04-14 17:00 ~
장소 : 500동 목암홀
일 시 : 2011년 4월 14일, 오후 5:00
장 소 : 500동 목암홀
-Abstract-
We have developed a ‘torsion spring’ type π-conjugated organic molecules which have a strong and specific self-assembly tendency into highly fluorescent and semiconducting supramolecular nanostructures including nanoparticle, nanowire, and nanofabrics. Very uniquely, self-assembly processes of these molecules are accompanied by a drastic fluorescence turn-on since the isolated molecule in solution before self-assembly is totally non-fluorescent. This is because the twisted molecular conformation is preferred in the isolated state, while the planarization and J-type stacking of the molecules take place through the self-assembly process to give a strong fluorescence emission. We have devised a method of growing and patterning these nanostructures either in a polymer film or in a soft lithographic mold. Aligned nanowires showed semiconducting and polarized light emission properties. Moreover, we were successful in fabricating electrically conducting coaxial nanowire comprising the organic nanowire (acceptor) core and conducting polymer (donor) shell with the charge transfer (CT) complex layer in-between them. Excellent electrical conductivity and the light emitting transistor behaviour will be demonstrated in this talk.
In the second part of my talk, I will broadly provide selective overview of conceptually novel luminescent materials recently developed in our group including the white-emitting single molecule, high contrast fluorescence switching nanoparticle, fluorescence switching with non-volatile readout, phosphorescence color tuning via inter-ligand energy transfer, and specific ion sensing via time-gated phosphorescence detection.
장 소 : 500동 목암홀
-Abstract-
We have developed a ‘torsion spring’ type π-conjugated organic molecules which have a strong and specific self-assembly tendency into highly fluorescent and semiconducting supramolecular nanostructures including nanoparticle, nanowire, and nanofabrics. Very uniquely, self-assembly processes of these molecules are accompanied by a drastic fluorescence turn-on since the isolated molecule in solution before self-assembly is totally non-fluorescent. This is because the twisted molecular conformation is preferred in the isolated state, while the planarization and J-type stacking of the molecules take place through the self-assembly process to give a strong fluorescence emission. We have devised a method of growing and patterning these nanostructures either in a polymer film or in a soft lithographic mold. Aligned nanowires showed semiconducting and polarized light emission properties. Moreover, we were successful in fabricating electrically conducting coaxial nanowire comprising the organic nanowire (acceptor) core and conducting polymer (donor) shell with the charge transfer (CT) complex layer in-between them. Excellent electrical conductivity and the light emitting transistor behaviour will be demonstrated in this talk.
In the second part of my talk, I will broadly provide selective overview of conceptually novel luminescent materials recently developed in our group including the white-emitting single molecule, high contrast fluorescence switching nanoparticle, fluorescence switching with non-volatile readout, phosphorescence color tuning via inter-ligand energy transfer, and specific ion sensing via time-gated phosphorescence detection.
