Personal profile
Research profile
In June 2022, Hiroki Tomita started his PhD project under the supervision of Prof. Reinder Coehoorn in the group of Molecular Materials and Nanosystems at the Eindhoven University of Technology. He is one of the PhD students working on the Suppressing Exciton Quenching in OLEDs: an Integrated Approach (SEQUOIA) project. His work is mainly focused on experimental analysis to reveal the exciton quenching mechanism inside OLED devices. The goal of this project is to develop an experimentally validated computational toolset for the search of OLED materials and structures with suppressed exciton quenching.
Quote
I often think in music. I get most joy in life out of my violin. -Albert Einstein
Academic background
Hiroki Tomita obtained his Bachelor’s degree in Applied Chemistry from Keio University (Keio), Japan in 2019. His bachelor project theme was about the synthesis of mesoporous n-type semiconducting ZnO films for photovoltaic applications. He then participated in a Double Degree Program and studied at Keio and KTH Royal Institute of Technology (KTH), Sweden for his Master’s program. He received his M.Sc. degree from KTH in 2021 and his M.Sc. degree from Keio in 2022. Both of his Master theses were focused on CuI, p-type semiconducting material, from the perspectives of optoelectronics and photovoltaics.
Education/Academic qualification
Chemistry, Master, Fabrication of Texured P-type Semiconductor CuI Films for Photo-functionalization, Keio University
1 Apr 2019 → 31 Mar 2022
Award Date: 31 Mar 2022
Chemistry, Master, Synthesis and Characterization of Copper Halide Complex Materials, Royal Institute of Technology
1 Jul 2020 → 31 Mar 2021
Award Date: 31 Mar 2021
Chemistry, Bachelor, Synthesis of Mesoporous Cubic ZnO Particles by the Control of MOF-5 Morphology and the Application for Self-Assembled Films, Keio University
1 Apr 2015 → 31 Mar 2019
Award Date: 31 Mar 2019
External positions
Violin player, Philips Symfonie Orkest
Expertise related to UN Sustainable Development Goals
In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This person’s work contributes towards the following SDG(s):
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SDG 7 Affordable and Clean Energy
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Collaborations and top research areas from the last five years
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Spectroelectrochemical Determination of Förster Radii for Triplet-Polaron Quenching in Phosphorescent Organic Light-Emitting Diodes
Jaspars, S. E. A., Tomita, H., van Hoesel, C., Daub, N., Janssen, R. A. J. & Coehoorn, R. (Corresponding author), 8 Oct 2025, In: Advanced Functional Materials. 35, 41, 13 p., 2425548.Research output: Contribution to journal › Article › Academic › peer-review
Open AccessFile3 Link opens in a new tab Citations (Scopus)20 Downloads (Pure) -
Electron affinity and binding energy of excitons in disordered organic semiconductors. III. Multimethod study for films of the blue fluorescent emitter MADN
de Jong, E. J., de Rooij, N. G., van Geel, W. F. M., Hauenstein, C., Tomita, H., Tirimbò, G., Berghuis, M., Gottardi, S., Baumeier, B. & Coehoorn, R. (Corresponding author), 4 Dec 2025, In: Physical Review B. 112, 22, 15 p., 224204.Research output: Contribution to journal › Article › Academic › peer-review
Open AccessFile3 Link opens in a new tab Citations (Scopus)9 Downloads (Pure) -
Large-Scale Determination of Frontier Orbital Energies of Disordered Small-Molecule Organic Semiconductors Using Exciplex Emission Spectra
McDonald, C. B. M., Tomita, H., Cotelli, G., Brüll, L. L., de Rooij, N. G., Norg, L. R. L., Clément, M. & Coehoorn, R. (Corresponding author), 8 May 2026, (E-pub ahead of print) In: Advanced Materials. XX, e73113.Research output: Contribution to journal › Article › Academic › peer-review
Open AccessFile1 Link opens in a new tab Citation (Scopus)1 Downloads (Pure) -
Exciton Binding Energy of Phosphorescent Emitter Molecules in Organic Light-Emitting Diodes
Tomita, H., Norg, L. R. L., Diederen, P. A., Hoesel, van, C., Weijtens, C. H. L., Bobbert, P. A. & Coehoorn, R., 27 May 2026, (E-pub ahead of print) In: Advanced Functional Materials. XX, 17 p., e75896.Research output: Contribution to journal › Article › Academic › peer-review
Open AccessFile3 Downloads (Pure) -
Simulation-assisted experimental study of excitonic processes in OLEDs: dissociation and quenching
Tomita, H., 1 Jul 2026, (Accepted/In press) Eindhoven: Eindhoven University of Technology. 216 p.Research output: Thesis › Phd Thesis 1 (Research TU/e / Graduation TU/e)
Open AccessFile3 Downloads (Pure)
Datasets
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Data underlying paper III. "... Multimethod study for films of the blue fluorescent emitter MADN"
de Jong, E. (Creator), de Rooij, N. (Creator), van Geel, W. F. M. (Creator), Hauenstein, C. (Creator), Tomita, H. (Creator), Tirimbò, G. (Creator), Berghuis, M. (Creator), Gottardi, S. (Creator), Baumeier, B. (Creator) & Coehoorn, R. (Creator), 4TU.Centre for Research Data, 31 Oct 2025
DOI: 10.4121/d320a48b-aed4-49c3-9885-82cbac8ffe5d.v1
Dataset
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Data underlying publication ”Large-scale determination of frontier orbital energies of disordered small-molecule organic semiconductors using exciplex emission spectra”
McDonald, C. B. M. (Creator), Tomita, H. (Creator), Cotelli, G. (Creator), Brüll, L. L. (Creator), de Rooij, N. G. (Creator), Norg, L. R. L. (Creator), Clément, M. (Creator) & Coehoorn, R. (Creator), 4TU.Centre for Research Data, 13 Apr 2026
DOI: 10.4121/a3790065-e04b-400a-87e6-76d78437b6ce.v2
Dataset
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Data underlying publication "Exciton binding energy of phosphorescent emitter molecules in organic light-emitting diodes"
Tomita, H. (Creator), Norg, L. R. L. (Creator), Diederen, P. A. (Creator), Hoesel, van, C. (Creator), Weijtens, C. H. L. (Creator), Bobbert, P. A. (Creator) & Coehoorn, R. (Creator), 4TU.Centre for Research Data, 18 May 2026
DOI: 10.4121/46bdd3ac-a896-4418-bfcb-005f4f79b6d2.v1
Dataset
Prizes
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Chemical Science Award
Tomita, H. (Recipient), 15 Nov 2024
Prize: Other › Career, activity or publication related prizes (lifetime, best paper, poster etc.) › Scientific