World's Best Scientists 2026 revealed!
Kei Ohkubo

Kei Ohkubo

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Chemistry
Japan
2026

D-Index & Metrics

Chemistry

D-Index
95
Citations
28263
World Ranking
1654
National Ranking
80

Kei Ohkubo publication distribution in Chemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Chemistry in 2026. The highlighted bar marks where Kei Ohkubo sits on this spectrum.

61–80 publications: 66 scientists 81–100 publications: 302 scientists 101–120 publications: 623 scientists 121–140 publications: 918 scientists 141–160 publications: 1,218 scientists 161–180 publications: 1,350 scientists 181–200 publications: 1,344 scientists 201–220 publications: 1,281 scientists 221–240 publications: 1,216 scientists 241–260 publications: 1,100 scientists 261–280 publications: 979 scientists 281–300 publications: 939 scientists 301–320 publications: 764 scientists 321–340 publications: 643 scientists 341–360 publications: 628 scientists 361–380 publications: 522 scientists 381–400 publications: 459 scientists 401–420 publications: 397 scientists 421–440 publications: 327 scientists 441–460 publications: 270 scientists 461–480 publications: 265 scientists 481–500 publications: 252 scientists 501–520 publications: 201 scientists 521–540 publications: 185 scientists 541–560 publications: 148 scientists 561–580 publications: 148 scientists 581–600 publications: 132 scientists 601–620 publications: 114 scientists 621–640 publications: 104 scientists 641–660 publications: 91 scientists 661–680 publications: 92 scientists 681–700 publications: 73 scientists 701–720 publications: 57 scientists 721–740 publications: 54 scientists 741–760 publications: 67 scientists 761–780 publications: 45 scientists 781–800 publications: 46 scientists 801–820 publications: 39 scientists 821–840 publications: 32 scientists 841–860 publications: 36 scientists 861–880 publications: 29 scientists 881–900 publications: 26 scientists 901–920 publications: 24 scientists 921–940 publications: 14 scientists 941–960 publications: 23 scientists 961–980 publications: 28 scientists 981–1,000 publications: 15 scientists 1,001–1,020 publications: 29 scientists 1,021–1,040 publications: 12 scientists 1,041–1,060 publications: 19 scientists 1,061–1,080 publications: 12 scientists 1,081–1,100 publications: 6 scientists 1,101–1,120 publications: 8 scientists 1,121–1,140 publications: 12 scientists 1,141–1,160 publications: 5 scientists 1,161–1,180 publications: 6 scientists 1,181–1,200 publications: 14 scientists 1,201–1,220 publications: 7 scientists 1,221–1,240 publications: 2 scientists 1,241–1,260 publications: 6 scientists 1,261–1,280 publications: 4 scientists 1,281–1,294 publications: 6 scientists 1,295+ publications: 100 scientists
61 publications 1,295+

This scientist: 496 publications — 88th percentile

88% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,295 publications or more.

Kei Ohkubo D-index placement in Chemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Chemistry scientists ranked by Research.com in 2026. The highlighted bar marks where Kei Ohkubo sits on this spectrum.

40–41 D-Index: 289 scientists 42–43 D-Index: 612 scientists 44–45 D-Index: 808 scientists 46–47 D-Index: 776 scientists 48–49 D-Index: 835 scientists 50–51 D-Index: 861 scientists 52–53 D-Index: 872 scientists 54–55 D-Index: 933 scientists 56–57 D-Index: 1,051 scientists 58–59 D-Index: 930 scientists 60–61 D-Index: 882 scientists 62–63 D-Index: 834 scientists 64–65 D-Index: 731 scientists 66–67 D-Index: 775 scientists 68–69 D-Index: 683 scientists 70–71 D-Index: 646 scientists 72–73 D-Index: 561 scientists 74–75 D-Index: 501 scientists 76–77 D-Index: 437 scientists 78–79 D-Index: 388 scientists 80–81 D-Index: 354 scientists 82–83 D-Index: 292 scientists 84–85 D-Index: 275 scientists 86–87 D-Index: 254 scientists 88–89 D-Index: 235 scientists 90–91 D-Index: 185 scientists 92–93 D-Index: 192 scientists 94–95 D-Index: 155 scientists 96–97 D-Index: 163 scientists 98–99 D-Index: 125 scientists 100–101 D-Index: 105 scientists 102–103 D-Index: 105 scientists 104–105 D-Index: 112 scientists 106–107 D-Index: 88 scientists 108–109 D-Index: 68 scientists 110–111 D-Index: 69 scientists 112–113 D-Index: 65 scientists 114–115 D-Index: 79 scientists 116–117 D-Index: 61 scientists 118–119 D-Index: 44 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 40 scientists 124–125 D-Index: 33 scientists 126–127 D-Index: 26 scientists 128–129 D-Index: 34 scientists 130–131 D-Index: 35 scientists 132–133 D-Index: 25 scientists 134–135 D-Index: 27 scientists 136–137 D-Index: 17 scientists 138–139 D-Index: 16 scientists 140–141 D-Index: 20 scientists 142–143 D-Index: 20 scientists 144–145 D-Index: 15 scientists 146–147 D-Index: 9 scientists 148–149 D-Index: 9 scientists 150–151 D-Index: 16 scientists 152–153 D-Index: 11 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 3 scientists 158 D-Index: 3 scientists 159+ D-Index: 98 scientists
40 D-Index 159+

This scientist: 95 D-Index — 91st percentile

91% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 159 D-Index or more.

Research.com Recognitions

  • 2026 - Research.com Chemistry in Japan Leader Award
  • 2025 - Research.com Chemistry in Japan Leader Award
  • 2022 - Research.com Chemistry in Japan Leader Award

Overview

Kei Ohkubo is affiliated with Osaka University in Japan and has a research focus primarily in the fields of Chemistry and Materials Science. Their scholarly work encompasses various subfields, including Organic Chemistry, Materials Chemistry, Physical and Theoretical Chemistry, Biomedical Engineering, and Biophysics.

The scientist's research covers several specialized topics, notably:

  • Free Radicals and Antioxidants
  • Radical Photochemical Reactions
  • Oxidative Organic Chemistry Reactions
  • Crystallization and Solubility Studies
  • X-ray Diffraction in Crystallography
  • Luminescence and Fluorescent Materials
  • Sulfur-Based Synthesis Techniques

Key recent publications illustrate the scope of this work:

  • "Fluorescein-Based Type I Supramolecular Photosensitizer via Induction of Charge Separation by Self-Assembly," 2022, JACS Au
  • "Acridinium salts as photoredox organocatalysts for photomediated cationic RAFT and DT polymerizations of vinyl ethers," 2021, Polymer Chemistry
  • "Chlorine-radical-mediated C-H oxygenation reaction under light irradiation," 2023, Chemical Communications
  • "Amphiphilic Rhodamine Nano-assembly as a Type I Supramolecular Photosensitizer for Photodynamic Therapy," 2022, ACS Applied Nano Materials
  • "9-Cyano-10-methoxycarbonylanthracene as a Visible Organic Photoredox Catalyst in the Two-Molecule Photoredox System," 2022, The Journal of Organic Chemistry

Frequently publishing in venues such as The Cambridge Structural Database and Chemical Communications, Kei Ohkubo also has multiple articles in Free Radical Biology and Medicine, Antioxidants, and ECS Meeting Abstracts.

Their collaborative network includes frequent coauthors such as Ikuo Nakanishi, Yoshimi Shoji, Shunichi Fukuzumi, Haruyasu Asahara, and Yuki Itabashi, reflecting a range of joint research engagements across related chemical and photochemical disciplines.

Best Publications

  • Electron-transfer state of 9-mesityl-10-methylacridinium ion with a much longer lifetime and higher energy than that of the natural photosynthetic reaction center.

    Shunichi Fukuzumi;Hiroaki Kotani;Kei Ohkubo;Seiji Ogo

  • Organic synthetic transformations using organic dyes as photoredox catalysts

    Shunichi Fukuzumi;Kei Ohkubo

  • Long-lived charge separation and applications in artificial photosynthesis.

    Shunichi Fukuzumi;Kei Ohkubo;Tomoyoshi Suenobu

  • Rational Principles for Modulating Fluorescence Properties of Fluorescein

    Tasuku Ueno;Yasuteru Urano;Ken-Ichi Setsukinai;Hideo Takakusa

  • Rational design principle for modulating fluorescence properties of fluorescein-based probes by photoinduced electron transfer.

    Tetsuo Miura;Yasuteru Urano;Kumi Tanaka;Tetsuo Nagano

  • Charge separation in a nonfluorescent donor-acceptor dyad derived from boron dipyrromethene dye, leading to photocurrent generation.

    Shigeki Hattori;Kei Ohkubo;Yasuteru Urano;Hisato Sunahara

  • Visible-Light-Induced Oxygenation of Benzene by the Triplet Excited State of 2,3-Dichloro-5,6-dicyano-p-benzoquinone

    Kei Ohkubo;Atsushi Fujimoto;Shunichi Fukuzumi;Shunichi Fukuzumi

  • Photocatalytic Oxygenation of Anthracenes and Olefins with Dioxygen via Selective Radical Coupling Using 9-Mesityl-10-methylacridinium Ion as an Effective Electron-Transfer Photocatalyst

    Hiroaki Kotani;Kei Ohkubo;Shunichi Fukuzumi

  • Simultaneous production of p-tolualdehyde and hydrogen peroxide in photocatalytic oxygenation of p-xylene and reduction of oxygen with 9-mesityl-10-methylacridinium ion derivatives

    Kei Ohkubo;Kentaro Mizushima;Ryosuke Iwata;Kazunori Souma

  • Quantitative Evaluation of Lewis Acidity of Metal Ions Derived from the g Values of ESR Spectra of Superoxide: Metal Ion Complexes in Relation to the Promoting Effects in Electron Transfer Reactions

    Shunichi Fukuzumi;Kei Ohkubo

  • Production of an Ultra‐Long‐Lived Charge‐Separated State in a Zinc Chlorin–C60 Dyad by One‐Step Photoinduced Electron Transfer

    Kei Ohkubo;Hiroaki Kotani;Jianguo Shao;Zhongping Ou

  • Photocatalytic Reduction of Low Concentration of CO2.

    Takuya Nakajima;Yusuke Tamaki;Kazuki Ueno;Eishiro Kato

  • Phosphorescent Sensor for Biological Mobile Zinc

    Youngmin You;Sumin Lee;Taehee Kim;Kei Ohkubo

  • Catalytic mechanisms of hydrogen evolution with homogeneous and heterogeneous catalysts

    Shunichi Fukuzumi;Shunichi Fukuzumi;Yusuke Yamada;Tomoyoshi Suenobu;Kei Ohkubo

  • Direct Oxygenation of Benzene to Phenol Using Quinolinium Ions as Homogeneous Photocatalysts

    Kei Ohkubo;Takaki Kobayashi;Shunichi Fukuzumi;Shunichi Fukuzumi

  • Photoalkylation of 10-Alkylacridinium Ion via a Charge-Shift Type of Photoinduced Electron Transfer Controlled by Solvent Polarity

    Shunichi Fukuzumi;Kei Ohkubo;Tomoyoshi Suenobu;Kouta Kato

  • Oxidation Mechanism of Phenols by Dicopper−Dioxygen (Cu2/O2) Complexes

    Takao Osako;Kei Ohkubo;Masayasu Taki;Yoshimitsu Tachi

  • Ultrafast Photodynamics of Exciplex Formation and Photoinduced Electron Transfer in Porphyrin−Fullerene Dyads Linked at Close Proximity

    Nikolai V. Tkachenko;Helge Lemmetyinen;Junko Sonoda;Kei Ohkubo

  • Photochemical and electrochemical properties of zinc chlorin-C60 dyad as compared to corresponding free-base chlorin-C60, free-base porphyrin-C60, and zinc porphyrin-C60 dyads.

    Shunichi Fukuzumi;Kei Ohkubo;Hiroshi Imahori;Jianguo Shao

  • Driving force dependence of intermolecular electron-transfer reactions of fullerenes.

    Shunichi Fukuzumi;Kei Ohkubo;Hiroshi Imahori;Dirk M. Guldi

  • Corrole-fullerene dyads: formation of long-lived charge-separated states in nonpolar solvents.

    Francis D'Souza;Raghu Chitta;Kei Ohkubo;Mariusz Tasior

Frequent Co-Authors

Shunichi Fukuzumi
Shunichi Fukuzumi Osaka University
Takahiko Kojima
Takahiko Kojima University of Tsukuba
Karl M. Kadish
Karl M. Kadish University of Houston
Jonathan L. Sessler
Jonathan L. Sessler The University of Texas at Austin
Taku Hasobe
Taku Hasobe Keio University
Francis D'Souza
Francis D'Souza University of North Texas
Maxwell J. Crossley
Maxwell J. Crossley University of Sydney
Yusuke Yamada
Yusuke Yamada Osaka Metropolitan University
Wonwoo Nam
Wonwoo Nam Ewha Womans University
Tomoyoshi Suenobu
Tomoyoshi Suenobu Osaka University

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