2022.12.09

The simplest structure of a stable radical showing high fluorescence efficiency in solution: benzene donors with triarylmethyl radicals

[Key Points]

• Professor Kingo Uchida’s research group (Materials Chemistry Course, Faculty of Advanced Science and Technology, Ryukoku University) has developed the simplest structure of a stable radical that exhibits high fluorescence efficiency in solvent, giving a maximum photoluminescence quantum yield of 69 %.
• Stable luminescent radicals differ from previous fluorescent substances and have been garnering interest as next-generation high-efficiency OELD materials and magneto-optical or spin-optical materials.
• The findings of this research are published in Chemical Science, a flagship journal of the Royal Society of Chemistry.

At the Faculty of Advanced Science and Technology, Ryukoku University, Assistant Professor Yohei Hattori, Professor Kingo Uchida, et al. have succeeded in creating a novel stable radical that shows high fluorescence efficiency in solution.

Light-emitting organic molecules are attracting increasing attention due to the widespread adoption of OELD displays. However, only a limited number of molecules are suitable for use as light-emitting materials in OELDs. The excited triplet state of normal fluorescent molecules exists at low energy, which causes electroluminescence efficiency to drop to a quarter of the quantum fluorescence yield of the molecule. By contrast, because the excited doublet state of stable luminescent radicals is low energy, they are expected to be excellent OELD materials and exhibit no reduction in luminescence efficiency.

The findings of this research have been published online in Chemical Science (open-access journal), a top journal of the Royal Society of Chemistry.

[Presented Paper]
Title: The simplest structure of a stable radical showing high fluorescence efficiency in solution: benzene donors with triarylmethyl radicals
Journal: Chemical Science
https://doi.org/10.1039/D2SC05079J
Authors:

• Yohei Hattori (Materials Chemistry Course, Faculty of Advanced Science and Technology, Ryukoku University)
• Ryota Kitajima (Materials Chemistry Course, Faculty of Advanced Science and Technology, Ryukoku University)
• Wataru Ota (MOLFEX, Inc.)
• Ryota Matsuoka (Department of Life and Coordination-Complex Molecular Science, Institute for Molecular Science / SOKENDAI (The Graduate University for Advanced Studies))
• Tetsuro Kusamoto (Department of Life and Coordination-Complex Molecular Science, Institute for Molecular Science / SOKENDAI (The Graduate University for Advanced Studies) / JST-PRESTO)
• Tohru Sato (Fukui Institute for Fundamental Chemistry, Kyoto University / Department of Molecular Engineering, Graduate School of Engineering, Kyoto University)
• Kingo Uchida (Materials Chemistry Course, Faculty of Advanced Science and Technology, Ryukoku University)

• Research paper on neuromorphic systems by Mutsumi Kimura’s research group published in international IEEE journal
• All
• A world’s first: crystalline capsules that release their contents upon irradiation with light. Developed by Professor Kingo Uchida’s research group (Faculty of Advanced Science and Technology) and published in Chemical Science, a journal of the Royal Society of Chemistry