This presentation describes the design and evaluation of new luminescent liquid crystalline compounds with a high contrast ratio, wide view angle, good electrooptical and dynamical parameters, to make them feasible for use in commercial production. The new generation of luminescent LCDs is closely related to guest-host LCDs where in nematic LC matrix (host) a small amount of dichroic or fluorescent dyers (guest) are introduced [1, 2]. The developed of New Generation Luminescent LCDs are based on the same technology as guest-host LCD’s. The most important issue is that instead of dichroic dyers (guest) or non-luminescent nematic LC compositions the luminescent LC compounds and the compositions (nematic with positive or negative dielectric anisotropy, or smectic) based upon them are used. The investigations of the electro-optical properties and dynamical parameters of the developed LCDs have shown their advantages in comparison with the well-known LCD’s. They are characterized over a wide temperature range of nematic or smectic A, or C phases with a low operating voltage, a fast response time and a high contrast ratio, and good brightness. The results demonstrate that the luminescent LC compounds are really promising for the production of high quality luminescent LC displays. The developed new luminescent compounds exhibit strong blue and green fluorescence in the visible region (the absorption and fluorescence spectral data are the following: for the blue λmax - 360nm and 440nm, for the green λmax – 360nm and 520nm correspondingly). We plane to design other similar red, green, blue (RGB) luminescent LC compositions, corresponding to the Gamut Diagram, to assess their ability to generate the new full color Luminescent LC display.

References [1] Ivashchenko A. V. Dichroic Dyes for Liquid Crystal Displays, CRC Press, London, 1994. [2] Zhang X., Gorohmaru H., Kadowaki M., Kobayashi T., Ishi-i T., Thiemann T., Mataka S. Benzo-2,1,3-thiadiazole-based, highly dichroic fluorescent dyes for fluorescent host–guest liquid crystal displays, J. Mater. Chem., v.14, pp.1901 – 1904 (2004).