Student Poster Award
The International Chemical Congress of Pacific Basin Societies 2015 (Pacifichem2015)
“Effective Photosensitized Energy Transfer of Nonanuclear Terbium
I am honored to be awarded “Student Poster Competition Award” at The International Chemical Congress of Pacific Basin Societies 2015 (Pacifichem2015). Lanthanide complexes show intense luminescence from lanthanide ions by energy transfer from organic ligands that absorbs light effectively. Efficiently luminescent lanthanide complexes require high energy transfer efficiency. The reverse process of this energy transfer called “back energy transfer” can significantly reduce the overall energy transfer efficiency. In order to suppress back energy transfer, its mechanism needs to be elucidated. In this study, I have used nonanuclear terbium clusters with substituent modified ligands. This allowed direct comparison between the photophysical properties of the clusters arising from the different electronic properties of the ligands, due to the rigidity of the structure preventing changes in properties arising from structural differences. Formerly, energy difference between triplet excited state and excited state of terbium ion was used to explain back energy transfer. This study reveals that energy transfer is an adiabatic process where not only the energy difference is important, but also the activation energy of the process.