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首页> 美国卫生研究院文献>Materials >Effect of Cell Thickness on the Electro-optic Response of Polymer Stabilized Cholesteric Liquid Crystals with Negative Dielectric Anisotropy
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Effect of Cell Thickness on the Electro-optic Response of Polymer Stabilized Cholesteric Liquid Crystals with Negative Dielectric Anisotropy

机译：单元厚度对负介电各向异性聚合物稳定的胆甾型液晶电光响应的影响

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摘要

It has previously been shown that for polymer-stabilized cholesteric liquid crystals (PSCLCs) with negative dielectric anisotropy, the position and bandwidth of the selective reflection notch can be controlled by a direct-current (DC) electric field. The field-induced deformation of the polymer network that stabilizes the devices is mediated by ionic charges trapped in or near the polymer. A unique and reversible electro-optic response is reported here for relatively thin films (≤5 μm). Increasing the DC field strength redshifts the reflection notch to longer wavelength until the reflection disappears at high DC fields. The extent of the tuning range is dependent on the cell thickness. The transition from the reflective to the clear state is due to the electrically controlled, chirped pitch across the small cell gap and not to the field-induced reorientation of the liquid crystal molecules themselves. The transition is reversible. By adjusting the DC field strength, various reflection wavelengths can be addressed from either a different reflective (colored) state at 0 V or a transparent state at a high DC field. Relatively fast responses (~50 ms rise times and ~200 ms fall times) are observed for these thin PSCLCs.
机译：先前已经表明，对于具有负介电各向异性的聚合物稳定的胆甾型液晶（PSCLC），可以通过直流（DC）电场控制选择性反射切口的位置和带宽。使器件稳定的聚合物网络的场致形变是由截留在聚合物中或附近的离子电荷介导的。对于相对较薄的薄膜（≤5μm），这里报道了独特且可逆的电光响应。直流电场强度的增加会将反射陷波移至更长的波长，直到在高直流电场下反射消失为止。调整范围的大小取决于单元的厚度。从反射状态到透明状态的过渡是由于跨小单元间隙的电控制，的间距，而不是由于液晶分子本身的场致重新取向。过渡是可逆的。通过调节DC场强，可以从0 V的不同反射（有色）状态或高DC场的透明状态解决各种反射波长。对于这些薄型PSCLC，观察到了相对较快的响应（上升时间约为50毫秒，下降时间约为200毫秒）。

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