Broadband cholesteric liquid crystal devices with poly(N-vinyl carbazole) microstructures

Jia Wei Hu, Tai An Chen, Shie-Chang Jeng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The particular thermally induced phase separation (TIPS) method was developed by using poly(N-vinyl carbazole) (PVK) dissolved in liquid crystal (LC) layer recently. Permanent scattering is produced via the particular TIPS due to the formation of poly-domain LCs. In this work, we applied the particular TIPS to a conventional cholesteric LC (CLC) device. A broadband CLC device with a poly-domain structure was demonstrated by using the particular TIPS of CLC and PVK. The CLC device fabricated by two indium tin oxide glass substrates coated with PVK films generated the rough PVK layers and microstructures when the device was cooled from a temperature higher than the clear point of CLCs. The produced poly-domain planar texture of CLCs still preserved the bistability. A high cooling rate and PVK concentration both increased the reflection bandwidth of the CLC devices.

Original languageEnglish
Pages (from-to)52-56
Number of pages5
JournalLiquid Crystals
Issue number1
StatePublished - 2 Jan 2015


  • broadband
  • cholesteric liquid crystal
  • poly-domain structure
  • thermally induced phase separation

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