TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The reflective layer is a cholesteric layer formed of a liquid crystal monomer and a chiral agent. The fluorescent material is at least one fluoresceins, rhodamines, coumarins, dansyls, 7-nitrobenzo-2-oxa-1,3-diazole pigments, pyrene, perylenes (preferred), phycobiliproteins, cyanine pigments, anthraquinones, thioindigoes and benzopyrans. The perylene fluorescent material has the structure of formula (A).X = halo or alkoxy; andR = aryl or alkyl.    TECHNOLOGY FOCUS - POLYMERS - Preferred Process: The light-emitting layer is formed of a matrix polymer and a fluorescent material. Preferred Components: The matrix polymer is at least one polymethylmethacrylate (preferred), polyacrylic resin, polycarbonate resin, polynorbornene resin, polyvinyl alcohol resin and cellulose resin. EXAMPLE - Parapet EH-1000P (RTM: Polymethyl methacrylate resin) was dissolved in toluene and 30 wt.% of polymer solution was prepared. Subsequently, perylene fluorescent material was dissolved in toluene and 1 wt.% of fluorescent material solution was prepared. Then 100 parts by weight of the polymer solution and 1.2 parts by weight of the fluorescent material solution were mixed together. The obtained mixture was cast onto a polyethylene terephthalate (PET) base material and dried at 90 degrees C for 20 minutes to obtain film. The film was separated from the PET base material to obtain light emitting layer. LC242 (RTM: Photopolymerizable nematic liquid crystal monomer), polymerizable chiral agent (4.75 parts by weight), Irgacure 907 (RTM: Photopolymerization initiator) (5 parts by weight), and solvent (methyl ethyl ketone) 385 parts by weight were mixed together and thus a coating solution was prepared. The coating solution was applied onto a stretched PET film with a wire at 100 degrees C for one minute. The coating film with a uniform aligned state was obtained. The obtained coating film was irradiated with ultraviolet light (at an exposure illuminance of 65 mW/cm2 for a total exposure time of 10 seconds), so that the aligned state was fixed to obtain reflective layer. The reflective layer was placed on one side of the light-emitting layer, so that the light-emitting layer and the reflective layer were laminated together to give a color purity improving sheet.