Influence of UV light intensity on dielectric behaviours of pure and dye-doped cholesteric liquid crystals

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dc.authoridKocakulah, Gulsum/0000-0001-5423-6957
dc.contributor.authorKocakulah, Gulsum
dc.contributor.authorYildirim, Mert
dc.contributor.authorKoysal, Oguz
dc.contributor.authorErcan, Ismail
dc.date.accessioned2021-12-01T18:48:14Z
dc.date.available2021-12-01T18:48:14Z
dc.date.issued2020
dc.department[Belirlenecek]en_US
dc.description.abstractThis study aims to explore the ultraviolet (UV) light effects on dielectric properties of azo dye methyl red (MR)-doped cholesteric liquid crystal (CLC) composite. The CLC composite formed in the study contains 5CB nematic liquid crystal (LC) and S811 chiral additive. To obtain CLC/MR composite, CLC was dispersed with 2% wt/wt MR azo dye. Dielectric measurements of the CLC and CLC/MR samples were performed using dielectric spectroscopy technique in wide frequency range in the absence of UV light and at various UV light intensities (30, 60 and 90 mW/cm(2)) for 0 and 40 V. It was observed that the dielectric constant increased with UV light at low-frequency values. Dielectric loss data were utilized to extract relaxation frequency which was observed to increase with UV light exposure. Dielectric anisotropy of CLC sample exhibited typical transition from p-type to n-type, but this behaviour disappears for CLC/MR composite above 60 mW/cm(2) UV light intensity. Cole-Cole plots were used for extraction of dielectric relaxation data and obtained results showed that CLC sample shows Debye type relaxation only at 0 V whereas CLC/MR composite exhibits non-Debye type relaxation both at 0 V and 40 V. Moreover, conductivity properties of the samples were also investigated, and dc conductivity values were extracted from experimental ac conductivity values. It was found that MR incorporation increased dc conductivity, also it was significantly increased by UV light exposure and thus similar effect was also observed in current-voltage characteristics of the samples. The results show that azo dye MR molecules are suitable for CLCs since they lead to some enhancements in dielectric and electrical properties.en_US
dc.description.sponsorshipDuzce University Scientific Research ProjectDuzce University [2020.05.02.1103]en_US
dc.description.sponsorshipThis work was supported financially by Duzce University Scientific Research Project (Project No: 2020.05.02.1103).en_US
dc.identifier.doi10.1007/s10854-020-04740-6
dc.identifier.endpage22397en_US
dc.identifier.issn0957-4522
dc.identifier.issn1573-482X
dc.identifier.issue24en_US
dc.identifier.scopus2-s2.0-85094973503en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage22385en_US
dc.identifier.urihttps://doi.org/10.1007/s10854-020-04740-6
dc.identifier.urihttps://hdl.handle.net/20.500.12684/10486
dc.identifier.volume31en_US
dc.identifier.wosWOS:000584998100005en_US
dc.identifier.wosqualityQ3en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.relation.ispartofJournal Of Materials Science-Materials In Electronicsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectElectrical-Propertiesen_US
dc.subjectPerformanceen_US
dc.titleInfluence of UV light intensity on dielectric behaviours of pure and dye-doped cholesteric liquid crystalsen_US
dc.typeArticleen_US

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