Understanding of Energy Transfer Dynamics in Luminescent Eu(III) Complex Doped Host-Guest Film
- PC Department Seminar
- Date: Aug 12, 2022
- Time: 11:00 AM (Local Time Germany)
- Speaker: Ms. Shiori Miyazaki
- Kyushu University, Japan
- Location: Building G
- Room: Seminar Room 2.06
- Host: S. Maehrlein & A. Shiotari
To apply the complexes for OLEDs, elucidation of the energy transfer
dynamics in the host-guest films is important. However, there are no
design strategies except for energy matching of their lowest excited
states. There are few direct observations of inter- and intra-molecular
energy transfer processes in host and guest systems [1,2]. Here, we
demonstrate a solution-processed system comprising a triazine-based host
material and Eu(hfa)3(TPPO)2 (hfa:
hexafluoroacetylacetonato, TPPO: triphenylphosphine oxide) shows
drastically improved total luminescence intensity by one order of
magnitude compared to conventional luminescent complexes. Time-resolved
spectroscopies uncovered that energy transfer processes after
photoexcitation of the triazine molecules take place via triplet states
over several molecules with nearly unity efficiency.
 S. Miyazaki, K. Miyata, H. Sakamoto, F. Suzue, Y. Kitagawa, Y. Hasegawa, K. Onda, J. Phys. Chem. A 124, 6601-6606 (2020).
 M. W. Mara, D. S. Tatum, A. March, G. Doumy, E. G. Moore, K. N. Raymond, J. Am. Chem. Soc. 141, 11071-11081 (2019).