2025-09-03 九州大学
Web要約 の発言：
図１ 開発した分子液体の分子構造と、室内光および紫外光を当てた時の写真。
＜関連情報＞
- https://www.kyushu-u.ac.jp/ja/researches/view/1321
- https://www.kyushu-u.ac.jp/f/63069/25_0903_01.pdf
- https://pubs.rsc.org/en/content/articlelanding/2025/sc/d5sc03768a
金属を含まない有機分子液体からの高速かつ効率的な常温蛍光 Fast and efficient room-temperature phosphorescence from metal-free organic molecular liquids
Yosuke Tani, Yuya Oshima, Rika Okada,Jun Fujimura,Yuji Miyazaki,Motohiro Nakano,Osamu Urakawa,Tadashi Inoue,Takumi Ehara,Kiyoshi Miyata,Ken Onda and Takuji Ogawa
Chemical Science Published:07 Aug 2025
DOI:https://doi.org/10.1039/D5SC03768A
Abstract
Liquid is the most flexible state of condensed matter and shows promise as a functional soft material. However, these same characteristics make it challenging to achieve efficient room-temperature phosphorescence (RTP) from metal-free organic molecular liquids. Herein, we report efficient RTP from liquefied thienyl diketones bearing one or two dimethyloctylsilyl (DMOS) substituents. These solvent-free liquids exhibit high RTP quantum yields up to 5.6% in air and 25.6% under Ar due to their large RTP rate constant exceeding 5000 s−1. Both liquids undergo excited-state conformational changes and afford monomer RTP, exhibiting essentially the same narrowband spectra as in solution. Moreover, introducing two DMOS substituents sufficiently suppresses aggregation-caused quenching of the molecularly emissive phosphors, illustrating a design principle for RTP-active liquid materials.
