Mochizuki Hiroyuki, Kawaguchi Yoshizo, Sasaki Fumio, Hotta Shu
J Nanosci Nanotechnol. 2016 Apr;16(4):3262-6. doi: 10.1166/jnn.2016.12280.
We evaluated emission behaviors of crystallized films of 1,4-bis(5-phenylthiophene-2-yl)benzene (AC5) in detail which was a representative thiophene/phenylene co-oligomer. The crystallized AC5 films were prepared by vapor deposition onto a substrate and thermal treatment. The AC5 films consisted of a crystalline domain with the size of several tens of micrometers. We used femtosecond laser pulses for the excitation of the AC5 films. As a result, the femtosecond laser pulses did not induce re-absorption above excitation energy densities of their laser threshold. The obtained gain value for AC5 crystallized film was large, over 150 cm-1. Furthermore, the emission cross section of the crystallized AC5 film was nearly 10(-16) cm2.
我们详细评估了1,4-双(5-苯基噻吩-2-基)苯(AC5)结晶薄膜的发射行为，AC5是一种具有代表性的噻吩/亚苯基共低聚物。通过气相沉积到衬底上并进行热处理来制备AC5结晶薄膜。AC5薄膜由尺寸为几十微米的结晶域组成。我们使用飞秒激光脉冲来激发AC5薄膜。结果，在高于其激光阈值的激发能量密度下，飞秒激光脉冲并未诱导再吸收。所获得的AC5结晶薄膜的增益值很大，超过150 cm-1。此外，AC5结晶薄膜的发射截面接近10(-16) cm2。
