Light-emitting organic field-effect transistors based on highly luminescent single crystals of thiophene/phenylene co-oligomers
作者:Takahiro Komori、Hajime Nakanotani、Takuma Yasuda、Chihaya Adachi
DOI:10.1039/c4tc00164h
日期:——
A series of thiophene/phenylene co-oligomers containing π-conjugated anthracene, naphthalene, and biphenyl central cores have been developed as new organic laser active materials. Light-emitting organic field-effect transistors (LE-OFETs) based on 2,6-bis(5-phenylthiophen-2-yl)anthracene (BPTA), 2,6-bis(5-phenylthiophen-2-yl)naphthalene (BPTN), and 2,6-bis(5-phenylthiophen-2-yl)-1,1′-biphenyl (BPTB) single crystals were fabricated. A clear laser oscillation was observed for BPTN and BPTB single crystals. Especially for BPTB, a low amplified spontaneous emission threshold of 1.8 ± 0.2 μJ cm−2 was achieved. In addition, all of the devices showed ambipolar transport characteristics, in which both electron and hole carriers are transported in a single FET device, and electroluminescence was clearly observed. An obvious difference in the light emission direction was observed for LE-OFET devices, which is attributed to the difference in transition dipole moment arrangement of individual molecules within the crystal.
一系列含有π-共轭蒽、萘和联苯中心核的噻吩/亚苯基共聚物已被开发为新型有机激光活性材料。制备了基于 2,6-双(5-苯基噻吩-2-基)蒽(BPTA)、2,6-双(5-苯基噻吩-2-基)萘(BPTN)和 2,6-双(5-苯基噻吩-2-基)-1,1′-联苯(BPTB)单晶体的发光有机场效应晶体管(LE-OFET)。在 BPTN 和 BPTB 单晶中观察到了明显的激光振荡。尤其是 BPTB,实现了 1.8 ± 0.2 μJ cm-2 的低放大自发辐射阈值。此外,所有器件都显示出伏极传输特性,即电子和空穴载流子都在单个场效应晶体管器件中传输,并能清晰地观察到电致发光。LE-OFET 器件的发光方向存在明显差异,这归因于晶体内单个分子的过渡偶极矩排列不同。