Improvement of the dielectric and electro-optic properties of phthalocyanine- and quantum dot-doped nematic liquid crystals under UV illumination
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Tarih
2022
Yazarlar
Dergi Başlığı
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Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this study, dielectric and electro-optic properties of 4-pentyl-4 '-cyanobiphenyl (5CB) nematic liquid crystal (LC) and different concentrations of nickel (II) phthalocyanine (Ni(II)Pc) and cadmium selenide sulfide/zinc sulfide (CdSeS/ZnS) quantum dot (QD)-doped LC have been investigated in dark and ultraviolet (UV) illumination. Some important dielectric parameters such as the real and imaginary part of the complex dielectric constant (epsilon ' and epsilon ''), relaxation frequency (f(R)), and relaxation time (tau) have been determined. The output of the study shows that Ni(II)Pc and CdSeS/ZnS contribution and UV illumination improved the dielectric properties. Optical band gap (E-gap) values of all samples have been obtained using the UV spectroscopy technique. The E-gap value decreased after dispersion of Ni(II)Pc and CdSeS/ZnS in the pure LC. The results may be beneficial for the design of new optoelectronic devices.
Açıklama
Anahtar Kelimeler
Liquid crystal, phthalocyanine, quantum dot, dielectric properties, electro-optic properties, Director Relaxation Frequency, Electrical-Conductivity, Enhancement, Composites
