Dual Energy Transfer Pathways from an Antenna Ligand to Lanthanide Ion in Trivalent Europium Complexes with Phosphine-Oxide Bridges
Trivalent europium (Eu3+) complexes are attractive materials for luminescence applications if energy transfer from antenna ligands to the lanthanide ion is efficient. However, the microscopic mechanisms of the transfer remain elusive, and fundamental physical chemistry questions still require answer...
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| Veröffentlicht in: | The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2020-08, Vol.124 (33), p.6601-6606 |
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| container_title | The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory |
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| creator | Miyazaki, Shiori Miyata, Kiyoshi Sakamoto, Haruna Suzue, Fumiya Kitagawa, Yuichi Hasegawa, Yasuchika Onda, Ken |
| description | Trivalent europium (Eu3+) complexes are attractive materials for luminescence applications if energy transfer from antenna ligands to the lanthanide ion is efficient. However, the microscopic mechanisms of the transfer remain elusive, and fundamental physical chemistry questions still require answers. We track the energy transfer processes in a luminescent complex Eu(hfa)3(DPPTO)2 (hfa, hexafluoroacetylacetonate; DPPTO, 2-diphenylphosphoryltriphenylene) using time-resolved photoluminescence spectroscopy. In addition to the conventional energy transfer pathway through the T1 state of the ligands, we discovered ultrafast energy transfer pathway directly from the singlet excited states of the ligands to the 5D1 state of Eu3+. The short time scale of the energy transfer (3 ns, 200 ns) results in its high photoluminescence quantum yield. The discovery of the distinct energy transfer pathways from a single chromophore is important for establishing design strategies of luminescent complexes. |
| doi_str_mv | 10.1021/acs.jpca.0c02224 |
| format | Article |
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The short time scale of the energy transfer (3 ns, 200 ns) results in its high photoluminescence quantum yield. 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| subjects | A: Kinetics, Dynamics, Photochemistry, and Excited States Chemistry Chemistry, Physical Physical Sciences Physics Physics, Atomic, Molecular & Chemical Science & Technology |
| title | Dual Energy Transfer Pathways from an Antenna Ligand to Lanthanide Ion in Trivalent Europium Complexes with Phosphine-Oxide Bridges |
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