Articles | Volume 2, issue 1
https://doi.org/10.5194/mr-2-33-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/mr-2-33-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
17 Feb 2021
Research article |
| 17 Feb 2021
| 17 Feb 2021
Room-temperature hyperpolarization of polycrystalline samples with optically polarized triplet electrons: pentacene or nitrogen-vacancy center in diamond?
Koichiro Miyanishi
CORRESPONDING AUTHOR
Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-Ku, Kyoto 615-8510, Japan
Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland
Kazuyuki Takeda
Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
Izuru Ohki
Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
Shinobu Onoda
Institute for Quantum Life Science, National Institutes for Quantum and Radiological Science and Technology, 4-9-1, Anagawa, Inage-Ku, Chiba 263-8555, Japan
Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan
Takeshi Ohshima
Institute for Quantum Life Science, National Institutes for Quantum and Radiological Science and Technology, 4-9-1, Anagawa, Inage-Ku, Chiba 263-8555, Japan
Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan
Hiroshi Abe
Institute for Quantum Life Science, National Institutes for Quantum and Radiological Science and Technology, 4-9-1, Anagawa, Inage-Ku, Chiba 263-8555, Japan
Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan
Hideaki Takashima
Department of Electronic Science and Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
Shigeki Takeuchi
Department of Electronic Science and Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
Alexander I. Shames
Department of Physics, Ben-Gurion University of the Negev, 8410501 Beer-Sheva, Israel
Kohki Morita
Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
Yu Wang
Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
Frederick T.-K. So
Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-Ku, Kyoto 615-8510, Japan
Institute for Quantum Life Science, National Institutes for Quantum and Radiological Science and Technology, 4-9-1, Anagawa, Inage-Ku, Chiba 263-8555, Japan
Daiki Terada
Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-Ku, Kyoto 615-8510, Japan
Institute for Quantum Life Science, National Institutes for Quantum and Radiological Science and Technology, 4-9-1, Anagawa, Inage-Ku, Chiba 263-8555, Japan
Ryuji Igarashi
Institute for Quantum Life Science, National Institutes for Quantum and Radiological Science and Technology, 4-9-1, Anagawa, Inage-Ku, Chiba 263-8555, Japan
Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan
JST, PRESTO, Kawaguchi, Japan
Akinori Kagawa
Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
JST, PRESTO, Kawaguchi, Japan
Center for Quantum Information and Quantum Biology, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, 1-2 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
Masahiro Kitagawa
Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
Center for Quantum Information and Quantum Biology, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, 1-2 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
Norikazu Mizuochi
Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
Masahiro Shirakawa
Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-Ku, Kyoto 615-8510, Japan
Institute for Quantum Life Science, National Institutes for Quantum and Radiological Science and Technology, 4-9-1, Anagawa, Inage-Ku, Chiba 263-8555, Japan
Makoto Negoro
CORRESPONDING AUTHOR
Institute for Quantum Life Science, National Institutes for Quantum and Radiological Science and Technology, 4-9-1, Anagawa, Inage-Ku, Chiba 263-8555, Japan
JST, PRESTO, Kawaguchi, Japan
Center for Quantum Information and Quantum Biology, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, 1-2 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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Latest update: 07 Feb 2026
Short summary
We show 13C spin hyperpolarization using laser irradiation at room temperature in two different systems: 1. pentacene doped in organic crystals of benzoic acid and 2. nitrogen-vacancy (NV) color centers in microdiamonds. The 13C NMR signal was enhanced by a factor of > 3000 using pentacene and > 300 using NV centers as polarization sources. We analyze the pros and cons of these two systems and discuss their prospects for room-temperature enhancement of NMR signals.
We show 13C spin hyperpolarization using laser irradiation at room temperature in two different...
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