Linearly polarized electroluminescence device in which the polarized plane can be rotated electrically using a chiral liquid crystalline semiconductor,Materials Chemistry Frontiers

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Linearly polarized electroluminescence device in which the polarized plane can be rotated electrically using a chiral liquid crystalline semiconductor
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2020-05-19 , DOI: 10.1039/d0qm00086h
Masahiro Funahashi _{1,

2,

3,

4,

5} , Yuki Mori _{1,

2,

3,

4,

5}

Affiliation

In the electroluminescence from chiral liquid crystals comprising a bis(fluorophenyl)terthiophene unit with macroscopic polarization, two characteristic phenomena were observed. Firstly, linearly polarized light was emitted from the polarized liquid crystal phase under a DC bias, and the polarized plane of the electroluminescence was rotated by 90° owing to the inversion of the polarity of the DC bias applied during the phase transition from the chiral smectic A phase to the chiral crystal smectic phase. This resulted in a low threshold voltage in 2 μm thick samples having a symmetric structure. Secondly, the hole and electron injection barriers at the electrodes were significantly reduced by the internal electric field produced by the macroscopic polarization of the liquid crystal. This is the first report on linearly polarized electroluminescence with a polarized plane that can be rotated.

中文翻译：

线性偏振电致发光器件，其中偏振面可以使用手性液晶半导体进行电旋转

在包含具有宏观极化的双（氟苯基）对噻吩单元的手性液晶的电致发光中，观察到两个特征现象。首先，在DC偏压下从偏振液晶相发出线性偏振光，并且由于从手性近晶相转变期间施加的DC偏压的极性反转，电致发光的偏振面旋转了90°。手性晶体近晶相的一个相。这导致具有对称结构的2μm厚样品中的阈值电压低。其次，电极的空穴和电子注入势垒由于液晶的宏观极化产生的内部电场而大大减小。

更新日期：2020-07-02

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