Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.040
Publication date: 18th December 2023
Excited triplets of organic molecules have the interesting features of long excitation lifetime and spin polarization. Among various functions of excited triplets, our recent works on the development of chromophore assemblies exhibiting photon upconversion and singlet fission will be presented.
Triplet-triplet annihilation based photon upconversion (TTA-UC) from visible light to UV light is useful for various photocatalysts including artificial photosynthesis, but its low efficiency (<10%) has been a problem for several years. We have developed a chromophore pair that exhibits a high TTA-UC efficiency of over 20%, which is two times higher than the previous record for Vis-to-UV TTA-UC. The Ir coumarin complex shows strong absorption in the visible range and relatively weak absorption in the UV range and does not quench the upconverted UV emission. By combining the Ir coumarin complex with TIPS-naphthalene, we have achieved a high TTA-UC efficiency of over 20% and a very low threshold excitation intensity Ith below solar irradiance.1,2 Furthermore, we have recently developed bicontinuous porous monoliths showing visible to UV TTA-UC and will introduce the details in the talk.
We are also interested in the spin degree of freedom of singlet fission in the context of quantum information science (QIS).3 We developed chromophore assemblies and dimers exhibiting singlet fission, and successfully observed quantum coherence of quintet triplet dimer state at room temperature for the first time. We found that the suppressed chromophore dynamics is crucial for achieving both of quintet formation and quantum coherence.
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