Understanding Correlation Among Electron-Phonon-Spin Degree of Freedom in Advanced Molecular Optoelectronics
- IMS-FHI Joint Online Seminar
- Date: Jul 4, 2022
- Time: 10:00 AM (Local Time Germany)
- Speaker: Kiyoshi Miyata
- Department of Chemistry, Kyushu University
- Host: Takashi Kumagai
e.g. superior optoelectronic properties of lead-halide perovskites materials likely originate from its unique electron-phonon coupled dielectric screening of carriers [1,2], electron spin-ﬂip of intersystem crossing in molecular optoelectronic materials are strongly connected to molecular geometries in the excited states and vibronic coupling [3,4], and singlet ﬁssion, ultrafast generation of a correlated triplet pair state from a singlet excited state, is viewed as an extreme example of a concerted process of electron-phonon-spin degrees of freedom [5,6]. Here, I would like to discuss a few topics mainly focusing on thermally activated delayed ﬂuorescence and singlet ﬁssion materials regarding the quest to understand the functions using various time-resolved spectroscopy.
 H. Zhu , K. Miyata , Y. Fu, J. Wang, P. P. Joshi, D. Niesner, K. W. Williams, S. Jin, X.-Y. Zhu, “Screening in crystalline liquids protects energetic carriers in hybrid perovskites”, Science 353, 1409-1413 (2016).
 K. Miyata, D. Meggiolaro, M. T. Trinh, P. P. Joshi, E. Mosconi, S. C. Jones, F. D. Angelis, X.- Y. Zhu, “Large polarons in lead halide perovskites”, Science Advances 3, e1701217 (2017).
 K. Miyata, Y. Kurashige, K. Watanabe, T. Sugimoto, S. Takahashi, S. Tanaka, J. Takeya, T. Yanai, Y. Matsumoto, “Coherent singlet ﬁssion activated by symmetry breaking”, Nature Chem. 9, 983-989 (2017).
 K. Miyata, F. S. Conrad-Burton, F. L. Geyer, X.-Y. Zhu, “Triplet pair states in singlet ﬁssion”, Chem. Rev. 119, 4261-4292 (2019).
 M. Saigo, K. Miyata, S. Tanaka, H. Nakanotani, C. Adachi, K. Onda, “Suppression of Structural Change upon S –T Conversion Assists the Thermally Activated Delayed Fluorescence Process in Carbazole-Benzonitrile Derivatives”,
J. Phys. Chem. Lett. 10, 2475-2480 (2019).
 Y. Shimoda, K. Miyata*, M. Saigo, Y. Tsuchiya, C. Adachi, K. Onda, “Intramolecular-rotation driven triplet-to-singlet upconversion and ﬂuctuation induced ﬂuorescence activation in linearly connected donor–acceptor molecules”,
J. Chem. Phys. 153, 204702 (2020).
Meeting ID: 831 6475 6176