Improved Crystal-Growth and Emission Gain-Narrowing of Thiophene/Phenylene Co-Oligomers


  • This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) for Organic Materials Technology for a Solid-State Injection Laser theme. This work was also supported by a Grant-in-Aid for COE Research (10CE2003) from the Japanese Ministry of Education, Culture, Sports, Science, and Technology.


Large plate-like single crystals of several millimeters to ∼ 1 cm in size of organic semiconducting materials are prepared via an improved crystal-growth technique. The crystals (see Figure) exhibit self-waveguided amplified spontaneous emission with a relatively small threshold resulting from the excellent optical properties of the crystals, such as high transparency and low light scattering.