Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Nobuhiro Yanai Last modified date:2021.11.01

Associate Professor / Biofunctional Chemistry / Department of Applied Chemistry / Faculty of Engineering


Presentations
1. 楊井 伸浩, Challenging Photon Upconversion Enabled by New Dye Development, 11th Asian Photochemistry Conference (APC 2021), 2021.11.
2. 楊井 伸浩, Solving Challenging Problems in Visible-to-UV and NIR-to-Visible Photon Upconversion by Developing New Dyes, nanoGe Spring Meeting, 2021.03, Photon upconversion from visible to ultraviolet (UV) light was inefficient, and photon upconversion from near-infrared (NIR) to visible light was difficult. We show how the development of new dyes has overcome these application-relevant issues.
The discovery of a new excellent UV emitter, TIPS-naphthalene, has enabled the highest visible-to-UV upconversion efficiency of 20.5%. In addition, the threshold excitation intensity is lower than the solar irradiance, and UV light can be generated even from sunlight or desk LED lights.
NIR-to-visible upconversion has been difficult due to the energy loss caused by the intersystem crossing (ISC) of triplet sensitizers, but by using Os complexes that show S-T absorption, which essentially contains no energy loss of ISC, it has become possible to convert from NIR to yellow, blue, and even violet light with good efficiencies..
3. 楊井 伸浩, Materials chemistry of triplet dynamic nuclear polarization, The 3rd International Forum on Quantum Metrology and Sensing (IFQMS), 2020.12.
4. 楊井 伸浩, Photon Upconversion and Triplet Dynamic Nuclear Polarization in MOFs, PRiME 2020 Meeting, 2020.10.
5. 楊井 伸浩, NIR-to-Visible Photon Upconversion for Applications in Energy and Biology, Japan-Taiwan Young Scientists Polymer Symposium, 第69回高分子討論会, 2020.09.
6. 楊井 伸浩, Materials Chemistry of triplet-DNP, Weekly ssNMR/DNP Zoominar, 2020.07, [URL], Dynamic nuclear polarization with photo-excited triplet electrons (triplet-DNP) has the potential to enhance the sensitivity of nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) at a moderate temperature. While much efforts have been devoted to obtaining the large nuclear polarization based on triplet-DNP, the application of triplet-DNP has been limited to nuclear physics experiments. The recent introduction of materials chemistry into the field of triplet-DNP realizes the air-stable and water-soluble polarizing agents as well as the hyperpolarization of nanomaterials with a large surface area such as nanoporous metal-organic frameworks (MOFs) and nanocrystal dispersion in water..
7. 楊井 伸浩, Functional chemistry of triplet state, the SPIRITS international symposium – Shaping self-assembled mesoscale (bio)materials with microengineering, 2020.02.
8. 楊井 伸浩, Near infrared-to-blue photon upconversion for optogenetics, ISIPS2019, 2019.11.
9. 楊井 伸浩, Materials chemistry of photo-excited triplet state for dynamic nuclear polarization, 第57回日本生物物理学会年会, 2019.09.
10. 楊井 伸浩, Functional chemistry of triplet state, 化学と生命のかけはし 2019, 2019.07.
11. 楊井 伸浩, Near Infrared-to-Visible Photon Upconversion, China-Japan-Singapore Joint Symposium on Supramolecular Systems and Optoelectronic Functions, 2019.06.
12. 楊井 伸浩, Functional Chemistry of Photo-excited Triplet State: from Photon Upconversion to Dynamic Nuclear Polarization, 15th International Symposium on Applied Bioinorganic Chemistry (ISABC15), 2019.06.
13. 楊井 伸浩, Near Infrared-to-Visible Photon Upconversion, China-Japan-Singapore Joint Symposium on Supramolecular Systems and Optoelectronic Functions, 2019.06.
14. 楊井 伸浩, NIR-to-Visible Photon Upconversion for Energy Applications, International Conference on Photocatalysis and Photoenergy 2019 (ICoPP 2019), 2019.05.
15. 楊井 伸浩, Making Triplet Dynamic Nuclear Polarization More Accessible and Feasible, 60th Experimental Nuclear Magnetic Resonance Conference (ENC 2019), 2019.04, 核磁気共鳴分光法(NMR)は、分子の構造や運動性を非破壊的に分析できる有力な手法の一つであり、磁気共鳴画像法(MRI)としても応用されている。しかし室温における核スピンの偏極率が低いため、NMRやMRIの感度は非常に低い。この問題を解決する方法として、より大きな電子スピンの偏極を核スピンへと移行する動的核偏極法(DNP)がある。中でも励起三重項電子を偏極源として用いるtriplet-DNPは、室温でNMRやMRIを高感度化できるとして注目を集めている。
従来のtriplet-DNPの対象は主に密な有機結晶に限られ、高感度化したい生体分子を取り込むことが難しかった。そこで生体分子を結晶内に取り込み高核偏極化することを指向し、triplet-DNPにより多孔性金属錯体(MOF)の1H核を高偏極化することに初めて成功した。また、これまでのtriplet-DNPの偏極源(ペンタセン)は空気中で不安定であったが、電子吸引性の窒素原子を導入したジアザペンタセン、ジアザテトラセンを合成し、空気中で安定な偏極源の開発に初めて成功した。.
16. 楊井 伸浩, Photon Upconverting Molecular Systems, Pusan National University, 2018.12.
17. 楊井 伸浩, Photon Upconversion in Molecular Assemblies, 10th Asian Photochemistry Conference (APC) 2018, 2018.12.
18. 楊井 伸浩, Molecular Materials for Photon Upconversion, ICPAC Langkawi 2018, 2018.10.
19. 楊井 伸浩, Photon Upconversion in Self-Assembled Molecular Materials, SPIE Optics + Photonics 2018, 2018.08.
20. 楊井 伸浩, Photon Upconversion in Self-Assembled Molecular Systems, Spring Meeting of the Polymer Society of Korea, 2018.04.
21. 楊井 伸浩, Photon Upconversion in Self-Assembled Molecular Systems, Department of Chemistry, University of Liverpool, 2018.04.
22. 楊井 伸浩, Photon Upconversion based on Triplet Energy Migration, RSC Inorganic Chemistry Symposium, 2016.10.
23. 楊井 伸浩, Photon Upconversion in Chromophore Arrays Preorganized by Coordination Chemistry, 第66回錯体化学討論会, 2016.09.
24. 楊井 伸浩, Photon upconverting molecular assemblies, Japan-Taiwan Joint Seminar on Energy and Environment for Young Chemists, 2016.06.
25. 楊井 伸浩, Photon Upconversion by Triplet Energy Migration in Molecular Assemblies, Seminar at Center for Plastic Electronics, 2015.10.
26. 楊井 伸浩, Photon Upconversion in Organic Nanomaterials, MNC2015, 2015.10.
27. 楊井 伸浩, Photon Upconversion by Triplet Energy Migration in Molecular Assemblies, Seminar at Cavendish laboratory, 2015.10.
28. 楊井 伸浩, Supramolecular Systems for photon conversion technologies, China-Japan Joint Symposium on Functional Supramolecular Architectures, 2014.12.
29. 楊井 伸浩, 君塚 信夫, Photon Upconversion Meets Supramolecular Self-Assembly, IPC2014, 2014.12.
30. 楊井 伸浩, Prasenjit Mahato, 君塚 信夫, Photon Upconversion in MOFs, MOF2014, 2014.09.
31. 楊井 伸浩, Prasenjit Mahato, Angelo Monguzzi, 君塚 信夫, Photon Upconversion in Self-Assembled Molecular Systems, IUMRS-ICA2014, 2014.08.
32. 楊井 伸浩, DUAN PENGFEI, Prasenjit Mahato, Angelo Monguzzi, 君塚 信夫, Triplet Exciton Migration and Photon Upconversion in Self-Assembled Molecular Systems, Gordon research conference on Electronic Processes in Organic Materials, 2014.05.