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Kei Ohkubo

Kei Ohkubo

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Chemistry
Japan
2026

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 95 1654 1471 80 76 496 28263

Kei Ohkubo publications per year

The chart shows the history of publications by Kei Ohkubo between 1990 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Kei Ohkubo published across 36 years, from 1990 to 2025, averaging 14.7 papers a year. Output peaked at 51 publications in 2015. 19 of the 530 publications appeared in the last two years.

No. of publications
10 20 30 40 50
Bar chart. Horizontal axis: year, 1990 to 2025. Vertical axis: number of publications, 0 to 51. Peak 51 publications in 2015. 1990: 1 publication 1991: 0 publications 1992: 0 publications 1993: 0 publications 1994: 0 publications 1995: 0 publications 1996: 0 publications 1997: 0 publications 1998: 3 publications 1999: 0 publications 2000: 3 publications 2001: 13 publications 2002: 13 publications 2003: 23 publications 2004: 17 publications 2005: 14 publications 2006: 25 publications 2007: 29 publications 2008: 33 publications 2009: 18 publications 2010: 25 publications 2011: 24 publications 2012: 43 publications 2013: 35 publications 2014: 29 publications 2015: 51 publications 2016: 32 publications 2017: 11 publications 2018: 13 publications 2019: 11 publications 2020: 12 publications 2021: 11 publications 2022: 13 publications 2023: 9 publications 2024: 9 publications 2025: 10 publications
1990 2025

530 publications in total across all disciplines

View publications per year as a table
Kei Ohkubo: publications per year, 1990 to 2025
Year Publications
1990 1
1991 0
1992 0
1993 0
1994 0
1995 0
1996 0
1997 0
1998 3
1999 0
2000 3
2001 13
2002 13
2003 23
2004 17
2005 14
2006 25
2007 29
2008 33
2009 18
2010 25
2011 24
2012 43
2013 35
2014 29
2015 51
2016 32
2017 11
2018 13
2019 11
2020 12
2021 11
2022 13
2023 9
2024 9
2025 10
Total 530
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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.

No. of scientists
250 500 750 1,000 1,250
Bar chart with 63 bars. Horizontal axis: publications, 61–80 to 1,295+. Vertical axis: number of scientists, 0 to 1,350. Most scientists, 1,350, have 161–180 publications. The last bar groups every scientist with 1,295 publications or more. The highlighted bar, 481–500 publications, is where this scientist sits. 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
61–80 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.

View publications distribution as a table
Number of Chemistry scientists by publication count, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
Publications Scientists This scientist
61–80 66
81–100 302
101–120 623
121–140 918
141–160 1,218
161–180 1,350
181–200 1,344
201–220 1,281
221–240 1,216
241–260 1,100
261–280 979
281–300 939
301–320 764
321–340 643
341–360 628
361–380 522
381–400 459
401–420 397
421–440 327
441–460 270
461–480 265
481–500 252 496
501–520 201
521–540 185
541–560 148
561–580 148
581–600 132
601–620 114
621–640 104
641–660 91
661–680 92
681–700 73
701–720 57
721–740 54
741–760 67
761–780 45
781–800 46
801–820 39
821–840 32
841–860 36
861–880 29
881–900 26
901–920 24
921–940 14
941–960 23
961–980 28
981–1,000 15
1,001–1,020 29
1,021–1,040 12
1,041–1,060 19
1,061–1,080 12
1,081–1,100 6
1,101–1,120 8
1,121–1,140 12
1,141–1,160 5
1,161–1,180 6
1,181–1,200 14
1,201–1,220 7
1,221–1,240 2
1,241–1,260 6
1,261–1,280 4
1,281–1,294 6
1,295+ 100
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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.

No. of scientists
250 500 750 1,000
Bar chart with 61 bars. Horizontal axis: D-Index, 40–41 to 159+. Vertical axis: number of scientists, 0 to 1,051. Most scientists, 1,051, have 56–57 D-Index. The last bar groups every scientist with 159 D-Index or more. The highlighted bar, 94–95 D-Index, is where this scientist sits. 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
40–41 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.

View D-Index distribution as a table
Number of Chemistry scientists by D-index, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
D-Index Scientists This scientist
40–41 289
42–43 612
44–45 808
46–47 776
48–49 835
50–51 861
52–53 872
54–55 933
56–57 1,051
58–59 930
60–61 882
62–63 834
64–65 731
66–67 775
68–69 683
70–71 646
72–73 561
74–75 501
76–77 437
78–79 388
80–81 354
82–83 292
84–85 275
86–87 254
88–89 235
90–91 185
92–93 192
94–95 155 95
96–97 163
98–99 125
100–101 105
102–103 105
104–105 112
106–107 88
108–109 68
110–111 69
112–113 65
114–115 79
116–117 61
118–119 44
120–121 37
122–123 40
124–125 33
126–127 26
128–129 34
130–131 35
132–133 25
134–135 27
136–137 17
138–139 16
140–141 20
142–143 20
144–145 15
146–147 9
148–149 9
150–151 16
152–153 11
154–155 9
156–157 3
158 3
159+ 98
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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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