US Patent 7213934 Light emitting medium and illumination system

The present invention relates to a light emitting medium which includes a container and a liquid core. In accordance with an important aspect of the invention, the liquid core includes an aqueous solution or mixture of a water-soluble polymer. The refractive indices of the liquid core and that of the container may be different. However, the aqueous solution or mixture may have a lower or higher refractive index than that of the container. The mixture may be completely transparent or translucent and have a color other than clear. The container may be of any material that is translucent or transparent and be of any color.