Koo Woo-Seung, Chung Hyung-Koo, Park Hong-Gyu, Han Jae-Jun, Jeong Hae-Chang, Cho Min-Jae, Kim Dai-Hyun, Seo Dae-Shik
J Nanosci Nanotechnol. 2014 Nov;14(11):8609-14. doi: 10.1166/jnn.2014.9953.
It is well known that doping nanoparticles (NPs) in liquid crystals (LCs) can easily change the physical and electro-optical properties of LC mixture. In this paper, we demonstrate homogeneous, aligned nematic LC (N-LC) system dispersed in iron oxide (Fe2O3) NPs. The prepared Fe2O3 NPs have an average particle size of 50 nm. By changing the doping concentration of Fe2O3 NPs, we observed the characteristics of LC systems. Electrooptical (EO) characteristics included faster rising and falling times (2.14 ms and 10.24 ms, respectively) and lower driving voltage (1.45 V) compared with a pure N-LC cell. We demonstrated these results via the relationship between dielectric con- stant and LC device properties. The results were verified by software simulation based on general physical properties. Moreover, we observed that LC system with Fe2O3 NPs could be accomplished without capacitance hysteresis by capturing charged impurities. Superior performance of LC cell with Fe2O3 NPs indicates that the proposed LC system have strong potential for use in the production of advanced LC displays.
众所周知，在液晶（LC）中掺杂纳米颗粒（NPs）可以轻松改变液晶混合物的物理和电光特性。在本文中，我们展示了分散在氧化铁（Fe2O3）纳米颗粒中的均匀、取向的向列相液晶（N-LC）系统。制备的Fe2O3纳米颗粒的平均粒径为50纳米。通过改变Fe2O3纳米颗粒的掺杂浓度，我们观察了液晶系统的特性。与纯N-LC单元相比，电光（EO）特性包括更快的上升和下降时间（分别为2.14毫秒和10.24毫秒）以及更低的驱动电压（1.45伏）。我们通过介电常数与液晶器件特性之间的关系证明了这些结果。这些结果通过基于一般物理特性的软件模拟得到了验证。此外，我们观察到含有Fe2O3纳米颗粒的液晶系统可以通过捕获带电杂质而实现无电容滞后。含有Fe2O3纳米颗粒的液晶单元的卓越性能表明，所提出的液晶系统在先进液晶显示器的生产中具有强大的应用潜力。
