紫外光强对聚合物分散液晶电光特性的影响  

Effect of UV intensities on electro-optic properties of polymer dispersed liquid crystal

作　　者：陈菲[1] 徐荣青[1] 李若舟 严静 

机构地区：[1]南京邮电大学电子与光学工程学院微电子学院,江苏南京210023 [2]南京邮电大学射频集成与微组装技术国家地方联合工程实验室,江苏南京210023

出　　处：《液晶与显示》2018年第8期631-637,共7页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金青年科学基金(No.61704090);江苏省自然科学基金青年基金(No.BK20170908;No.BK20170903);江苏省高等学校自然科学研究面上项目(No.17KJB510041;No.17KJB510040);射频集成与微组装技术国家地方联合工程实验室开放课题(No.KFJJ20170307;No.KFJJ20170204);南京邮电大学引进人才科研启动基金资助(No.NY217123;No.NY217124);南京邮电大学校级科研基金资助(NY218020)~~

摘　　要：聚合物分散液晶(PDLC)是液晶微滴分散在聚合物基体中形成的一种具有优异电光性能的材料,PDLC的电光特性对基于PDLC的电光器件的性能具有显著影响。本文对紫外固化光强对PDLC电光特性的影响进行研究。本研究使用紫外照射引发的聚合物诱导相分离方法制备PDLC。在4个不同紫外固化光强(1mW/cm^2、1.8mW/cm^2、3mW/cm^2和9mW/cm^2)条件下制备PDLC样品,并对4个样品的电光特性如电压-透过率、响应时间和迟滞效应进行研究,并对实验结果给出了分析。实验结果表明:随着紫外固化光强的增加,PDLC的阈值电压和饱和电压增加,开态响应时间ton上升,关态响应时间toff下降,同时对于高紫外光强聚合制备的样品迟滞效应也更加明显。本研究表明可以通过改变制备过程中的紫外光强来优化PDLC的电光特性,从而获得性能优异的基于PDLC的电光器件。Polymer Dispersed Liquid Crystal(PDLC)is a high performance electro-optic material.The electro-optical properties of PDLC have great influence on the performance of applications based on PDLC.In this paper,we studied the effect of UV intensities on electro-optic properties of PDLC.PDLC samples are fabricated by polymer induced phase separation(PIPS)method initiated by UV irradiation.Four PDLC samples were prepared using four UV light intensities of 1 mW/cm^2,1.8 mW/cm^2,3 mW/cm^2 and 9 mW/cm^2.The electo-optical properties of voltage-transmittance curve,response time and hysteresis effect are studied.With the increase of the UV intensity,the threshold voltage and saturation voltage increase.The rise time increases while the decay time decreases for high intensity UV irradiation.The hysteresis effect also becomes severe.This work suggests that it is possible to optimize the electro-optical properties of PDLC by adjusting the UV intensities and obtain PDLC based devices that possess good electro-optical performance.

关 键 词：聚合物分散液晶 紫外固化光强 电光特性 响应时间 迟滞效应 

分 类 号：TP141.9[自动化与计算机技术—控制理论与控制工程] O753.2[自动化与计算机技术—控制科学与工程]