H
Hayato Sakai
Researcher at Keio University
Publications - 70
Citations - 1491
Hayato Sakai is an academic researcher from Keio University. The author has contributed to research in topics: Singlet fission & Porphyrin. The author has an hindex of 21, co-authored 64 publications receiving 1189 citations. Previous affiliations of Hayato Sakai include Nara Institute of Science and Technology & National Archives and Records Administration.
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Journal ArticleDOI
Long-Lived Triplet Excited States of Bent-Shaped Pentacene Dimers by Intramolecular Singlet Fission
Takao Sakuma,Hayato Sakai,Yasuyuki Araki,Tadashi Mori,Takehiko Wada,Nikolai V. Tkachenko,Taku Hasobe +6 more
TL;DR: The femtosecond and nanosecond transient absorption spectra clearly revealed the slower ISF process in bent-shaped pentacene dimers, more notably, the slower relaxation of the excited triplet states in P cD-Biph and PcD-3Ph.
Journal ArticleDOI
Highly Fluorescent [7]Carbohelicene Fused by Asymmetric 1,2-Dialkyl-Substituted Quinoxaline for Circularly Polarized Luminescence and Electroluminescence
Hayato Sakai,Sho Shinto,Jatish Kumar,Yasuyuki Araki,Tomo Sakanoue,Taishi Takenobu,Takehiko Wada,Tsuyoshi Kawai,Taku Hasobe +8 more
TL;DR: A new 1,2-dialkylquinoxaline-fused carbohelicene (Hl-NAIQx) was designed and synthesized by asymmetrically introducing two alkyl chains onto the quinoxaline unit as mentioned in this paper.
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Siloxy Group-Induced Highly Efficient Room Temperature Phosphorescence with Long Lifetime
Masaki Shimizu,Ryosuke Shigitani,Masaki Nakatani,Keiko Kuwabara,Yusuke Miyake,Kunihiko Tajima,Hayato Sakai,Taku Hasobe +7 more
TL;DR: In this article, a green phosphorescence-emitting 1,4-dibenzoyl-2,5-bis(siloxy)benzene crystals in air at room temperature were observed.
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Supramolecular structures and photoelectronic properties of the inclusion complex of a cyclic free-base porphyrin dimer and C60.
Hirofumi Nobukuni,Yuichi Shimazaki,Hidemitsu Uno,Yoshinori Naruta,Kei Ohkubo,Takahiko Kojima,Shunichi Fukuzumi,Shunichi Fukuzumi,Shu Seki,Hayato Sakai,Taku Hasobe,Fumito Tani +11 more
TL;DR: To construct a photoelectrochemical cell, C60⊂H4-CPD(Py) was deposited onto nanostructured SnO2 films on a transparent electrode and exhibited photovoltaic activity with an incident photon to current conversion efficiency of 17%.
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Synthetic Control of the Excited-State Dynamics and Circularly Polarized Luminescence of Fluorescent "Push-Pull" Tetrathia[9]helicenes.
Yuki Yamamoto,Hayato Sakai,Junpei Yuasa,Junpei Yuasa,Yasuyuki Araki,Takehiko Wada,Tomo Sakanoue,Taishi Takenobu,Tsuyoshi Kawai,Taku Hasobe +9 more
TL;DR: In this work, introduction of a quinoxaline onto the tetrathia[9]helicene skeleton induced the "push-pull" character, which was enhanced by further introduction of an electron-releasing Me2 N group or an electron -withdrawing NC group onto the quInoxaline unit (denoted as Me2N-QTTH and NC-QtTH, respectively).