[D-8] Optoelectronics and Thermoelectronic Devices

[D-8-03] Lasing and optical waveguide characteristics in one-dimensional crystals of thiophene/phenylene co-oligomers

〇Takumi Matsuo^1,2, Shotaro Hayashi¹, Fumio Sasaki², Hisao Yanagi³ (1. School of Environmental Sci. and Eng., Kochi Univ. of Tech. (Japan), 2. Res. Inst. for Advanced Electronics and Photonics (RIAEP), National Inst. of Advanced Indus. Sci. and Tech. (AIST) (Japan), 3. Graduate School of Sci. and Tech., Nara Inst. of Sci. and Tech. (NAIST) (Japan))

Presentation style: Online

https://doi.org/10.7567/SSDM.2022.D-8-03

One-dimensional (1D) organic microstructures are important for lasers, optical waveguides, and photonic circuits. Among various organic compounds, thiophene/phenylene co-oligomers (TPCOs) are promising materials as laser media in single crystal state owing to their high photoluminescence (PL) quantum efficiency, robustness, and high carrier mobilities. However, their potentials for transporting photons are still unrevealed.
We report here the characterization of lasing behaviors in 1D TPCO crystals along with their optical waveguide characteristics. As the target materials, a series of TPCOs, 2,5-bis(4’-cyanobiphenyl-4-yl)thiophene (BP1T-CN) and 5,5’-bis(4’-cyano-biphenyl-4-yl)-2,2’-bithiophene (BP2T-CN) are obtained in solution phase. Apart from the lasing in the naturally formed crystal edges, the low values of attenuation coefficient estimated through the spatially-resolved PL measurements suggest that the obtained 1D TPCOs are superior materials for photonic applications.