TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The polymer-type binder contains metal soap of aluminum, silicon, titanium, chromium, manganese, iron, cobalt, nickel, silver, copper, zinc, molybdenum, tin, metal complex, or hydrolysis component of metal alkoxide. The metal nanoparticles are chosen from gold, platinum, palladium, ruthenium, nickel, copper, tin, indium, zinc, iron, chromium and manganese. The metal oxide is chosen from oxide of aluminum, silicon, titanium, chromium, manganese, iron, cobalt, nickel, silver, copper, zinc, molybdenum, tin, indium, and antimony. The metal hydroxide is chosen from hydroxide of aluminum, silicon, titanium, chromium, manganese, iron, cobalt, nickel, silver, copper, zinc, molybdenum, tin, indium and antimony. The metal soap, metal complex, or metal alkoxide and organometallic compound of silicon, titanium, chromium, manganese, iron, cobalt, nickel, silver, copper, zinc, molybdenum and tin.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The coupling agent is chosen from silane coupling agent, aluminum coupling agent and titanium coupling agent. The non-polymer type-binder is chosen from alkoxysilane, halosilane, 2-alkoxy ethanol, ( beta )-diketone and alkyl acetate. The dispersion medium is water and alcohol.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The electroconductive-oxide fine particles dispersion liquid is obtained by dispersing electroconductive-oxide fine particles in dispersion medium. The electroconductive-oxide fine particles dispersion liquid further contains coupling agent. The binder dispersion liquid contains polymer-type binder or non-polymer-type binder. The polymer-type binder is chosen from acrylic resin, polycarbonate, polyester, alkyd resin, polyurethane, acryl urethane, polystyrene, polyacetal, polyamide, polyvinyl alcohol, polyvinyl acetate, cellulose and siloxane polymer. The composite film has electroconductive reflecting film containing polyvinylpyrrolidone, and/or copolymer of water-soluble cellulose and polyvinylpyrrolidone, metal nanoparticles including 70% or more of particles having particle size of 10-50 nm, and additive. The additive is chosen from organic polymer, metal oxide, metal hydroxide, organometallic compound and silicone oil. The organic polymer is chosen from copolymer of water-soluble cellulose and polyvinylpyrrolidone, and polyvinylpyrrolidone. Preferred Properties: The maximum film thickness of layer (14b) is 10-500% of the film thickness of layer (14a). The thickness of each of layer (14a) and layer (14b) is 0.01-0.5 mu m. The thickness of electroconductive reflecting film is 0.05-2.0 mu m.