Organic Semiconductors with Helical Structure Based on Oligothiophene derivatives Exhibiting Chiral Nematic Phase
Organic Semiconductors with Helical Structure Based on Oligothiophene derivatives Exhibiting Chiral Nematic Phase
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DOI：
10.1080/15421400701735723
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发表时间：
2007-12
影响因子：
0.7
通讯作者：
M. Funahashi;N. Tamaoki
中科院分区：
文献类型：
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作者：
M. Funahashi;N. Tamaoki
我们合成了一种具有手性双折射相的液晶半导体2-[5-（4-[（S）-2-甲基丁氧基]苯基）-3-甲基]-2″′-丙基-2：5′-2 ′：5″-2″：5″′-四噻吩（10），并利用飞行时间技术测定了其载流子迁移率行为。在手性双相中，正载流子迁移率在120°C时为2 × 10−4 cm 2/Vs，负载流子迁移率为1 × 10−4 cm 2/Vs，这两个都归因于电子过程。对于负载流子，除了快速的电子过程外，我们还观察到缓慢的载流子传输，迁移率约为10−5 cm 2/Vs，我们将其归因于离子传导。含联萘基团的手性二聚体具有稳定的玻璃相，可以制备出在可见光区具有选择性反射带的手性二聚体薄膜。当紫外光照射时，它们发出二向色性参数为1.3的圆偏振光。
We have synthesized 2-[5-(4-[(S)-2-methylbutoxy]phenyl)-3-methyl]-2″′-propyl-2:5′-2′:5″-2″:5″′-quaterthiophene ( 10 ), a liquid crystalline semiconductor that exhibits a chiral nematic phase, and used the time-of-flight technique to determine its carrier mobility behavior. In the chiral nematic phase, the positive carrier mobility was 2 × 10−4 cm2/Vs at 120°C and the negative carrier mobility was 1 × 10−4 cm2/Vs, both of which we attribute to electronic processes. For the negative carrier, in addition to the fast electronic process, we also observed a slow carrier transport, having mobility on the order of 10−5 cm2/Vs, which we attribute to ionic conduction. Chiral dimers containing binaphthyl group exhibited stable glassy cholesteric phase and cholesteric thin films with selective reflection band in visible light area could be fabricated. They emitted circularly polarized light with dichroic parameter of 1.3 when UV light was illuminated.