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TEMPERATURE DEPENDENCE OF CHROMATICITY IN POLYMER DISPERSED CHOLESTERIC LIQUID CRYSTAL: REFLECTION AND TRANSMISSION CHARACTERSTICS

P. Pavlova1, L. Avramov1, H. Naradikian2, T. Angelov2,* , A. G. Petrov2

Affiliation

  1. Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd, 1784 Sofia, Bulgaria
  2. Institute of Solid State Physics, Bulgarian Academy of Sciences, 72, Tzarigradsko Chaussee Blvd, 1784 Sofia, Bulgaria

Abstract

This paper continues our investigations of polymer-dispersed cholesteric liquid crystals (PDLC) composition and distant control of the temperature [1]. A comparison of the colour features of the reflected and transmitted light was made. A sample of NOA 65/ thermo-indicator/ carbon black was tested by heating to different temperatures and registration of the spectra in the wavelength range 380 – 780 nm. Colours were calculated in the standard CIE system. The results show an expansion of the maximal optical activity to temperatures lower than those for the pure PDLC..

Keywords

Thermochromic liquid crystals, Polymer, Thermometer.

Submitted at: Dec. 9, 2004
Accepted at: Jan. 26, 2005

Citation

P. Pavlova, L. Avramov, H. Naradikian, T. Angelov, A. G. Petrov, TEMPERATURE DEPENDENCE OF CHROMATICITY IN POLYMER DISPERSED CHOLESTERIC LIQUID CRYSTAL: REFLECTION AND TRANSMISSION CHARACTERSTICS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 1, pp. 285-288 (2005)