Cited 12 time in webofscience Cited 17 time in scopus

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

Title
Investigation of nonionic diazo dye-doped polymer dispersed liquid crystal film
Authors
Ahmad, F[Ahmad, Farzana]Jamil, M[Jamil, Muhammad]Jeon, YJ[Jeon, Young Jae]Woo, LJ[Woo, Lee Jin]Jung, JE[Jung, Jae Eun]Jang, JE[Jang, Jae Eun]
DGIST Authors
Jung, JE[Jung, Jae Eun]; Jang, JE[Jang, Jae Eun]
Issue Date
2012-04
Citation
Bulletin of Materials Science, 35(2), 221-231
Type
Article
Article Type
Article
Keywords
Contrast RatioDichroic DyeDichroic DyesDroplet MorphologyDropsElectric FieldsLiquid Crystal DisplaysLiquid CrystalsMorphologyOptical PropertiesOrder ParameterPhase SeparationPlastic FilmsPolymer-Induced Phase Separation (PIPS)Polymer Dispersed Liquid Crystals (PDLC)Polymers
ISSN
0250-4707
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 (Vth), 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. © Indian Academy of Sciences.
URI
http://hdl.handle.net/20.500.11750/1703
DOI
10.1007/s12034-012-0286-6
Publisher
Indian Academy of Sciences
Related Researcher
  • Author Jang, Jae Eun Advanced Electronic Devices Research Group(AEDRG)
  • Research Interests
Files:
There are no files associated with this item.
Collection:
Information and Communication EngineeringETC1. Journal Articles


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