TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: A solution of soluble lithium salt is added to the colloidal solution before stirring.The layer formation process and substrate heating process are repeated to form a film comprising several layers, on the substrate, and each layer is heated after application.A bead of colloidal solution is formed on the substrate, and the bead is drawn over the surface, to form the film.The colloidal solution is screen printed or sprayed at room temperature, on the substrate, to form the film.The colloidal solution is diluted with ethanol before spraying.The solution of soluble lithium salt is obtained by dissolving lithium perchlorate, lithium nitrate or lithium acetate, in water or ethanol.The soluble lithium salt solution is added to mixture of colloidal solution and organic material, after evaporation.Preferred Component: The film comprises 12 layers, preferably more than 6 layers and more preferably 6-9 layers. Wavelength range (I) includes blue and green light, and wavelength range (II) includes yellow and red light.Preferred Conditions: The substrate is heated at 400-600degreesC, preferably 550-600degreesC, for 15-60 minutes, preferably 30-60 minutes.Ultrasonic stirring is performed with an ultrasonic stirrer or bath running at a frequency of 35 KHz, for 1-4 hours, preferably at least 2 hours.Cell (2) is provided behind the cell (1).CERAMIC AND GLASS - Preferred Substrate: The conductive substrate is a glass plate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: A solution of soluble lithium salt is added to the colloidal solution before stirring.The layer formation process and substrate heating process are repeated to form a film comprising several layers, on the substrate, and each layer is heated after application.A bead of colloidal solution is formed on the substrate, and the bead is drawn over the surface, to form the film.The colloidal solution is screen printed or sprayed at room temperature, on the substrate, to form the film.The colloidal solution is diluted with ethanol before spraying.The solution of soluble lithium salt is obtained by dissolving lithium perchlorate, lithium nitrate or lithium acetate, in water or ethanol.The soluble lithium salt solution is added to mixture of colloidal solution and organic material, after evaporation.Preferred Component: The film comprises 12 layers, preferably more than 6 layers and more preferably 6-9 layers. Wavelength range (I) includes blue and green light, and wavelength range (II) includes yellow and red light.Preferred Conditions: The substrate is heated at 400-600degreesC, preferably 550-600degreesC, for 15-60 minutes, preferably 30-60 minutes.Ultrasonic stirring is performed with an ultrasonic stirrer or bath running at a frequency of 35 KHz, for 1-4 hours, preferably at least 2 hours.Cell (2) is provided behind the cell (1).CERAMIC AND GLASS - Preferred Substrate: The conductive substrate is a glass plate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Material: Organic material (A) is chosen from ethanol, methanol or other volatile alcohols, and dimethyl sulfoxide, preferably ethanol.Organic material (B) is ethylene glycol, polyethylene glycol 200, 300, 600 and 1000, maltose, glucose, glycerol, mannitol or myo-inositol, preferably polyethylene glycol 300.