Laser induced electro-optical characterization of anthraquinone dye and fullerene C60 doped guest-host liquid crystal systems

Liquid crystals have become the focus of great interest in recent years particularly with applications in display technology. Guest-host liquid crystal displays (GH-LCDs) are widely utilized because of their many advantages such as color, wide viewing angle and high brightness. The aim of this study is to determine the electro-optical properties of disperse orange 11 dye and fullerene C60 doped GH-LCDs. A 40 mW He-Cd (λ = 441.6 nm) laser was used as a pumping source during the measurements, which were carried out by an impedance analyzer to observe the effect of laser illumination on the samples. Dielectric anisotropy was quantitatively estimated by using capacitive measurements and estimated as positive for all samples. Photoconductivity of the samples was defined under dark and illuminated conditions. Experimental results also indicate that laser pumping has a considerable effect on the photoconductivity.