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Bulletin of Materials Science

, Volume 35, Issue 2, pp 221–231 | Cite as

Investigation of nonionic diazo dye-doped polymer dispersed liquid crystal film

  • FARZANA AHMAD
  • MUHAMMAD JAMIL
  • YOUNG JAE JEONEmail author
  • LEE JIN WOO
  • JAE EUN JUNG
  • JAE EUN JANG
Article

Abstract

Sudan black B (SBB) was used to investigate as the nonionic diazo dye-doped in polymer dispersed liquid crystal (PDLC) display, by polymerization-induced phase separation (PIPS) method. The maximum absorbance, contrast ratio, dichroic ratio and the order parameter of nonionic diazo dye in nemetic host (TL203) were investigated using UV–Vis polarized spectroscopy. The orientation of the dye molecules was controlled by electric field, which enabled the contrast ratio of the dye to be obtained by electrically switching. The change occurring on droplet morphologies and electro-optical properties of PDLC film with the change in contents of Sudan black dye and liquid crystals (LC) contents was investigated. We found an increase in LC droplet sizes with the increase of diazo dye and LC contents. Moreover the addition of small amount of nonionic diazo dye reduced the threshold voltage (V\(_{\boldsymbol{\rm th}})\), increased off-state transmittance, enhanced the contrast ratio and decreased the response time of dye-doped PDLC. Additionally the change in transition temperature of LC and changes in LC droplet morphologies with the addition of dye were also observed. Such changes were observed with the images taken by polarized optical microscope (POM). The detail discussions on such behaviours were also made.

Keywords

Polymer dispersed liquid crystals (PDLC) polymer-induced phase separation (PIPS) droplet morphology order parameter dichroic dye contrast ratio 

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Copyright information

© Indian Academy of Sciences 2012

Authors and Affiliations

  • FARZANA AHMAD
    • 1
  • MUHAMMAD JAMIL
    • 1
    • 2
    • 3
  • YOUNG JAE JEON
    • 1
    Email author
  • LEE JIN WOO
    • 1
  • JAE EUN JUNG
    • 4
  • JAE EUN JANG
    • 4
  1. 1.Department of ChemistryKonkuk UniversitySeoulKorea
  2. 2.Division of International StudiesUniversity College, Konkuk UniversitySeoulKorea
  3. 3.Department of PhysicsKonkuk UniversitySeoulKorea
  4. 4.Department of Information and Communication EngineeringDaegu Gyeongbuk Institute of Science and Technology, (DGIST)DaeguKorea

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