Skip to main content
SpringerLink
Log in

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

  • Published:
Journal of Materials Science: Materials in Electronics Aims and scope Submit manuscript

Abstract

This 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/cm2) 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/cm2 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.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Fig. 12

Similar content being viewed by others

References

  1. S. Doke, A. Shinde, V. Raghavendra Reddy, P. Ganguly, S. Mahamuni, Liq. Cryst. 47(7), 1111–1118 (2020)

    Article  CAS  Google Scholar 

  2. H. Eskalen, Appl. Phys. A 126, 708 (2020)

    Article  CAS  Google Scholar 

  3. H. Eskalen, Ş. Özgan, S. Kerli, Appl. Phys. A 125, 873 (2019)

    Article  CAS  Google Scholar 

  4. F.P. Pandey, A. Rastogi, R. Manohar, R. Dhar, S. Singh, Liq. Cryst. 47(7), 1025–1040 (2020)

    Article  CAS  Google Scholar 

  5. A. Sharma, P. Malik, R. Dhar, P. Kumar, Bull. Mater. Sci. 42(5), 1–9 (2019)

    Google Scholar 

  6. P.-C. Wu, C.-T. Hou, Y.-C. Hsiao, W. Lee, Opt. Express 22(25), 31347 (2014)

    Article  CAS  Google Scholar 

  7. P.C. Wu, S.Y. Yang, W. Lee, J. Mol. Liq. 218, 150–155 (2016)

    Article  CAS  Google Scholar 

  8. S. Soni, D.D. Bishnoi, S. Soni, Ramswroop. Int. J. Mod. Phys. Conf. Ser. 22, 736–740 (2013)

    Article  Google Scholar 

  9. Y. Huang, Y. Zhou, S.-T. Wu, Liq. Cryst. X 6332, 63320F (2006)

    Article  Google Scholar 

  10. K.-S. Bae, Y.-J. Jang, C.-J. Yu, J.E. Jang, J.E. Jung, J.S. Choi, S.J. Park, J.-H. Kim, 48th Annu. SID Symp. Semin. Exhib. 2010, Disp. Week 2010 3 1755–1757 (2010)

  11. X. Hu, W. Zeng, W. Yang, L. Xiao, L.T. De Haan, W. Zhao, N. Li, L. Shui, G. Zhou, Liq. Cryst. 46(2), 185–192 (2019)

    Article  CAS  Google Scholar 

  12. M.C. Yeh, S.H. Yang, W. Lee, J. Mol. Liq. 296, 112082 (2019)

    Article  CAS  Google Scholar 

  13. L.J. Chen, J. De Lin, C.R. Lee, J. Mater. Chem. C 2(22), 4388–4394 (2014)

    Article  CAS  Google Scholar 

  14. Q. Yan, Z. Wei, P. Lin, Z. Cheng, M. Pu, Z. Huang, W. Lin, Opt. Mater. Express 8(6), 1536 (2018)

    Article  CAS  Google Scholar 

  15. D.N. Chausov, A.D. Kurilov, A.V. Kazak, A.I. Smirnova, V.К. Velichko, E.V. Gevorkyan, N.N. Rozhkova, N.V. Usol’tseva, Liq. Cryst. 46(9), 1345–1352 (2019)

    Article  CAS  Google Scholar 

  16. P.V. Dolganov, S.O. Gordeev, V.K. Dolganov, AYu. Bobrovsky, Mol. Cryst. Liq. Cryst. 633, 14–22 (2016)

    Article  CAS  Google Scholar 

  17. F. Du, Y.Q. Lu, H.W. Ren, S. Gauza, S.T. Wu, Jpn. J. Appl. Phys. Part I 43(10), 7083–7086 (2004)

    Article  CAS  Google Scholar 

  18. M. Mitov, E. Nouvet, N. Dessaud, Eur. Phys. J. E 15(4), 413–419 (2004)

    Article  CAS  Google Scholar 

  19. S.-Y. Huang, Y.-S. Chen, H.-C. Jau, M.-S. Li, J.-H. Liu, P.-C. Yang, A.Y.-G. Fuh, Opt. Commun. 283(9), 1726–1731 (2010)

    Article  CAS  Google Scholar 

  20. K.T. Cheng, C.K. Liu, C.L. Ting, A.Y.G. Fuh, Opt. Commun. 281(20), 5133–5139 (2008)

    Article  CAS  Google Scholar 

  21. O. Köysal, Synth. Met. 160, 1097–1100 (2010)

    Article  Google Scholar 

  22. H.H. Liang, C.C. Wu, P.H. Wang, J.Y. Lee, Opt. Mater. 33(8), 1195–1202 (2011)

    Article  CAS  Google Scholar 

  23. K.M. Lee, V.P. Tondiglia, T.J. White, Soft Matter 12(4), 1256–1261 (2016)

    Article  CAS  Google Scholar 

  24. A. Kumar, D. Varshney, J. Prakash, J. Mol. Liq. 303, 112520 (2020)

    Article  CAS  Google Scholar 

  25. G. Posnjak, Topological Formations in Chiral Nematic Droplets, 1st edn. (Springer Nature Switzerland AG, Cham, 2018), p. 55

    Book  Google Scholar 

  26. Ö.T. Özmen, K. Goksen, A. Demir, M. Durmuş, O. Köysal, Synth. Met. 162(24), 2188–2192 (2012)

    Article  Google Scholar 

  27. E. Orhan, M. Gökçen, O. Köysal, Synth. Met. 240, 8–14 (2018)

    Article  CAS  Google Scholar 

  28. C.Y. Huang, P. Selvaraj, G. Senguttuvan, C.J. Hsu, J. Mol. Liq. 286, 110902 (2019)

    Article  CAS  Google Scholar 

  29. K. Hu, Q. Weng, R. Chen, J. Li, D. Shi, P. Chen, A. Gao, X. Chen, Z. An, Liq. Cryst. (2020). https://doi.org/10.1080/02678292.2019.1710777

    Article  Google Scholar 

  30. S. Sridevi, U.S. Hiremath, C.V. Yelamaggad, S. Krishna Prasad, Y.G. Marinov, G.B. Hadjichristov, A.G. Petrov, Mater. Chem. Phys. 130, 1329–1335 (2011)

    Article  CAS  Google Scholar 

  31. P.-T. Lin, X. Liang, H. Ren, S.-T. Wu, Appl. Phys. Lett. 85(7), 1131–1133 (2004)

    Article  CAS  Google Scholar 

  32. B. Coşkun, J. Mol. Struct. 1191, 278–283 (2019)

    Article  Google Scholar 

  33. K.K. Pandey, P.K. Tripathi, A.K. Misra, R. Manohar, Results Phys. 8, 1119–1123 (2018)

    Article  Google Scholar 

  34. M. Yıldırım, A. Allı, G. Önsal, N. Gök, O. Köysal, Composites Part B 117, 43–48 (2017)

    Article  Google Scholar 

  35. R.R. Deshmukh, A.K. Jain, Liq. Cryst. 41(7), 960–975 (2015)

    Article  Google Scholar 

  36. M. Rahman, C.-W. Hsieh, C.-T. Wang, B.-R. Jian, W. Lee, Dyes Pigm. 84, 128–133 (2010)

    Article  CAS  Google Scholar 

  37. D. Jayoti, Khushboo, P. Malik, A. Singh, Liq. Cryst. 43(5), 623–631 (2016)

    Article  CAS  Google Scholar 

  38. N.Y. Canli, H. Ocak, A. Yildiz, M. Okutan, B.B. Eran, J. Mol. Liq. 238, 370–378 (2017)

    Article  CAS  Google Scholar 

  39. M. Yıldırım, O. Köysal, G. Önsal, E. Gümüş, J. Mol. Liq. 223, 868–872 (2016)

    Article  Google Scholar 

Download references

Acknowledgements

This work was supported financially by Düzce University Scientific Research Project (Project No: 2020.05.02.1103).

Author information

Authors and Affiliations

  1. Department of Physics, Faculty of Arts& Sciences, Düzce University, 81620, Düzce, Turkey

    Gülsüm Kocakülah & Oğuz Köysal

  2. Department of Mechatronics, Faculty of Engineering, Düzce University, 81620, Düzce, Turkey

    Mert Yıldırım

  3. Department of Biophysics, Institute for Research and Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, 31441, Dammam, Saudi Arabia

    İsmail Ercan

Authors
  1. Gülsüm Kocakülah
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Mert Yıldırım
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Oğuz Köysal
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. İsmail Ercan
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Oğuz Köysal.

Ethics declarations

Conflict of interest

The authors declare that they have no conflict of interest.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Kocakülah, G., Yıldırım, M., Köysal, O. et al. Influence of UV light intensity on dielectric behaviours of pure and dye-doped cholesteric liquid crystals. J Mater Sci: Mater Electron 31, 22385–22397 (2020). https://doi.org/10.1007/s10854-020-04740-6

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10854-020-04740-6

Search

Navigation