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Critical Role of Energy Transfer Between Terbium Ions for Suppression of Back Energy Transfer in Nonanuclear Terbium Clusters
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| Title: | Critical Role of Energy Transfer Between Terbium Ions for Suppression of Back Energy Transfer in Nonanuclear Terbium Clusters |
| Authors: | Omagari, Shun Browse this author | | Nakanishi, Takayuki Browse this author →KAKEN DB | | Kitagawa, Yuichi Browse this author | | Seki, Tomohiro Browse this author | | Fushimi, Koji Browse this author | | Ito, Hajime Browse this author | | Meijerink, Andries Browse this author | | Hasegawa, Yasuchika Browse this author →KAKEN DB |
| Issue Date: | 15-Nov-2016 |
| Publisher: | Nature Publishing Group |
| Journal Title: | Scientific reports |
| Volume: | 6 |
| Start Page: | 37008 |
| Publisher DOI: | 10.1038/srep37008 |
| Abstract: | Lanthanide (Ln(III)) complexes form an important class of highly efficient luminescent materials showing characteristic line emission after efficient light absorption by the surrounding ligands. The efficiency is however lowered by back energy transfer from Ln(III) ion to the ligands, especially at higher temperatures. Here we report a new strategy to reduce back energy transfer losses. Nonanuclear lanthanide clusters containing terbium and gadolinium ions, TbnGd9-n clusters ([TbnGd9-n(mu-OH)(10)(but ylsalicylate)(16)](+) NO3-, n = 0, 1, 2, 5, 8, 9), were synthesized to investigate the effect of energy transfer between Tb(III) ions on back energy transfer. The photophysical properties of TbnGd9-n clusters were studied by steady-state and time-resolved spectroscopic techniques and revealed a longer emission lifetime with increasing number of Tb(III) ions in TbnGd9-n clusters. A kinetic analysis of temperature dependence of the emission lifetime show that the energy transfer between Tb(III) ions competes with back energy transfer. The experimental results are in agreement with a theoretical rate equation model that confirms the role of energy transfer between Tb(III) ions in reducing back energy transfer losses. The results provide a new strategy in molecular design for improving the luminescence efficiency in lanthanide complexes which is important for potential applications as luminescent materials. |
| Rights: | https://creativecommons.org/licenses/by/4.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/63835 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 中西 貴之
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