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Chin. Phys. B, 2019, Vol. 28(1): 017801    DOI: 10.1088/1674-1056/28/1/017801
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Light absorption coefficients of ionic liquids under electric field

Ji Zhou(周吉)1, Shi-Kui Dong(董士奎)2, Zhi-Hong He(贺志宏)2, Ju-Lius Caesar Puoza3, Yan-Hu Zhang(张彦虎)4
1 Beijing Institute of Space Mechanics & Electricity, Beijing 100094, China;
2 School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
3 Department of Mechanical Engineering, Sunyani Technical University, P. O. Box 206, Sunyani, Ghana;
4 Advancd Manufacturing & Equipment Institute, Jiangsu University, Zhenjiang 212013, China
Abstract  

Ionic liquids have attracted a lot of research attention for their applications in novel optoelectronic structures and devices as an optical means of regulating electricity. Although the electro-optic effect of ionic liquids is mentioned in some literature, quantitative testing and analysis are hardly found in light absorption coefficients of ionic liquids under an electric field. In the present study, an experimental apparatus is designed to measure the absorption coefficients of ionic liquids under different electric fields. Five groups of imidazole ionic liquids are experimentally investigated and an inversion is performed to determine the spectral absorption coefficients of the imidazole ionic liquids under the electric fields. Different intensities with multiple interface refractions and reflections are also considered, and the various measurement errors are analyzed through uncertainties propagation analysis. Spectral absorptions of ionic liquids from 300 nm to 2500 nm are obtained and the absorption coefficients are retrieved. It is found that the absorption behavior of ionic liquids changes in some frequency bands under an applied electric field. The experimental results show that the absorption coefficient of the ionic liquid increases with the voltage increasing at 1520 nm and 1920 nm. The change rate is affected by the types of anions and cations in the ionic liquid and the diffusion rate of the ions therein. This study provides illustrations for the ionic liquid-based electro-optical regulation in terms of physical property parameters and the testing technique.

Keywords:  ionic liquid      absorption coefficient      electro-optical property      uncertainty propagation analysis  
Received:  29 June 2018      Revised:  10 November 2018      Published:  05 January 2019
PACS:  78.40.-q (Absorption and reflection spectra: visible and ultraviolet)  
  78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))  
  33.57.+c (Magneto-optical and electro-optical spectra and effects)  
  78.20.Jq (Electro-optical effects)  
Fund: 

Project supported by the National Natural Science Foundation of China (Grant Nos. 51576054 and 51705210).

Corresponding Authors:  Yan-Hu Zhang     E-mail:  zhyh@ujs.edu.cn

Cite this article: 

Ji Zhou(周吉), Shi-Kui Dong(董士奎), Zhi-Hong He(贺志宏), Ju-Lius Caesar Puoza, Yan-Hu Zhang(张彦虎) Light absorption coefficients of ionic liquids under electric field 2019 Chin. Phys. B 28 017801

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