Excitation Energy-Transfer Processes in the Sensitization Luminescence of Europium in a Highly Luminescent Complex |
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| Authors: | Dr. Yan-Jie Huang Can Ke Dr. Li-Min Fu Dr. Yu Li Dr. Shu-Feng Wang Ying-Chao Ma Prof. Jan-Ping Zhang Prof. Yuan Wang |
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| Affiliation: | 1. Beijing National Laboratory for Molecular Science State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering and Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871 China These authors contributed equally to this work;2. Department of Chemistry, Renmin University of China, Beijing, 100872 China;3. Institute of Modern Optics & State Key Laboratory for Artificial Microstructure and Mesoscopic Physics School of Physics, Peking University, China;4. Beijing National Laboratory for Molecular Science State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering and Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871 China |
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| Abstract: | The excitation energy transfer (EET) pathways in the sensitization luminescence of EuIII and the excitation energy migration between the different ligands in [Eu(fod)3dpbt] [where fod=6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedione and dpbt=2-(N,N-diethylanilin-4-yl)-4,6-bis(3,5-dimethylpyrazol-1-yl)-1,3,5-triazine], exhibiting well-separated fluorescence excitation and phosphorescence bands of the different ligands, were investigated by using time-resolved luminescence spectroscopy for the first time. The data clearly revealed that upon the excitation of dpbt, the sensitization luminescence of EuIII in [Eu(fod)3dpbt] was dominated by the singlet EET pathway, whereas the triplet EET pathway involving T1(dpbt) was inefficient. The energy migration from T1(dpbt) to T1(fod) in [Eu(fod)3dpbt] was not observed. Moreover, upon the excitation of fod, a singlet EET pathway for the sensitization of EuIII luminescence, including the energy migration from S1(fod) to S1(dpbt) was revealed, in addition to the triplet EET pathway involving T1(fod). Under the excitation of dpbt at 410 nm, [Eu(fod)3dpbt] exhibited an absolute quantum yield for EuIII luminescence of 0.59 at 298 K. This work provides a solid and elegant example for the concept that singlet EET pathway could dominate the sensitization luminescence of EuIII in some complexes. |
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| Keywords: | Europium energy transfer sensitization luminescence singlet pathway time-resolved spectroscopy |
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