[23p-1BC-1~19] 12.3 Functional Materials and Novel Devices

4:30 PM - 4:45 PM JST(7:30 AM - 7:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[23p-1BC-11] Highly Fluorescent and Flexible Optical Waveguide Constituted by a Crystal of Benzofuran Derivative

〇Takumi Matsuo¹, Shotaro Hayashi¹ (1.Kochi Univ. of Tech.)

Keywords:

Flexible organic single crystals,Benzohuran,Crystal engineering

Highly fluorescent and flexible optical waveguides composed of π-conjugated molecules are expected to be applied for organic photonics such as flexible optical waveguides. The flexibility derives from the slipping of intermolecular face-to-face π-stacking when the mechanical stress is applied to the crystals while the crystal framework is maintained. However, the packing motif easily induces excimer formation, resulting in low fluorescence quantum efficiency (Φ_PL). To overcome this problem, we designed a molecule substituted by benzofuran referring a model molecule with thiophene substituents, which has been utilized as a flexible organic single crystal. As a result, we obtained flexible organic single crystal with Φ_PL higher than 50% for the first time.