Functional Chemistry of Triplet State

Welcome! We're in Kyushu, Japan.

We are experimental chemists working at Kyushu University, Japan. We are interested in creating new functional chemistry of photo-excited triplet state. We are particularly interested in triplet-triplet annihilation-based photon upconversion (TTA-UC) for many applications ranging from renewable energy production to photodynamic therapy and optogenetics. We have also recently started a new project on triplet-DNP (dynamic nuclear polarization) towards the room-temperature hyperpolarization of biomolecules for advanced NMR/MRI technologies. Trying to establish new concepts in materials science from Kyushu!!

An example of our photon upconversion materials:

Latest News

2021.11.23 New paper published in Nanoscale about perovskite-sensitized green-to-UV TTA-UC, and two manuscripts deposited in ChemRxiv (heavy metal-free visible-to-UV TTA-UC and triplet-DNP of guest molecules in a flexible MOF).

2121.11.4 Received The Asian and Oceanian Photochemistry Association (APA) Prize for Young Scientist on behalf of my great group members and collaborators. Grateful for the recognition on our upconversion and hyperpolarization works using photo-excited triplet.

2021.10.20 Another joint paper with the Jenny Clark group about the competition between singlet fission and energy collection in NIR-to-visible TTA-UC has been published in J. Mater. Chem. C.

2021.10.14 Collaboration work with the Jenny Clark group about the new understanding of spin statistics of TTA-upconversion has been published in JACS Au.

2021.9.21 Received The Japanese Photochemistry Association Award for Young Scientist.

2021.5.13 Published the design guideline to achieve porphyrins with high polarization as well as long spin-lattice relaxation time in J. Phys. Chem. A

2021.4.21 Appointed as a Research Area Advisor of JST-PRESTO "Future Materials".

2021.4.6 Received the Young Scientist Award by MEXT (Ministry of Education, Culture, Sports, Science and Technology) for our works on photon upconversion and triplet-DNP.

2021.3.11 Debuted porphyrins as new polarizing agents in J. Phys. Chem. Lett. This is also the first example of triplet-DNP of biomolecules.

2021.3.4 Published the first example of rigid epoxy resins showing photon upconversion in ACS Appl. Mater. Interfaces.

2021.2.20 Published an editorial article for the J. Chem. Phys. special issue "Up- and down-conversion in molecules and materials".

2021.2.9 Selected as a J. Mater. Chem. C. Emerging Investigator 2021. The first collaboration paper with the Moth-Poulsen group.

2020.12.18 Press Release from Angew. Chem. about our recent paper on visible-to-UV upconversion.

2020.12.9 Our recent Angew. paper was highlighted in ChemStation.

2020.12.4 News Release from EurekAlert!

2020.11.25 Interview article is published in STI Horizon. (in Japanese, 文部科学省 科学技術・学術政策研究所 ナイスステップな研究者インタビュー)

2020.10.16 New paper in Angew. Chem. Int. Ed.: Discovery of Key TIPS‐Naphthalene for Efficient Visible‐to‐UV Photon Upconversion under Sunlight and Room Light.

2020.7.31 Gave an online talk at NISTEP, MEXT (in Japanese, 文部科学省 科学技術・学術政策研究所)

2020.7.1 Gave a talk at the online seminar organized by the Griffin group, MIT. Video is available:

2020.7.3 Our review article about materials chemistry of triplet-DNP has been highlighted as a Front Cover of Chem. Commun.

2020.5.15 Talked about our recent upconversion and hyperpolarization works in the online symposium organized by ChemStation (the largest chemistry portal site in Japan).

Video is available:

2019.12.06 Selected as "NISTEP Selection (The Researchers with Nice Step) 2019" from NISTEP, MEXT, Japan. Sincere thanks to great group members and collaborators!!

2019.7.26 Welcome Emily Raulerson (Roberts group, U. Texas Austin), Emily Moses (Tang group, UC Riverside), and Matthew Quan (Ferry group, U. Minnesota)! They'll stay for 3 weeks in Fukuoka to start our collaboration projects through NSF IRES program.

2019.5.6 Received The Wiley Young Researcher Award conferred on early career researchers in the Asia-Pacific region. It's a great honor to be selected among hundreds of applications.

Contact Address

Department of Chemistry and Biochemistry, Graduate School of

Engineering, Kyushu University

744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan

TEL +81-92-802-2832

E-mail: yanai[at]

〒819-0395 福岡市西区元岡744番地 ウエスト3号館8階

九州大学 大学院工学研究院 応用化学部門

TEL: 092-802-2832