TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The acidic radical is carboxyl, phospho, sulfo, sulfonyl imide, perfluoro alkylene sulfo, perfluoro phenylene sulfo or perfluoro alkylene sulfonyl imide.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The conductive polymer (A) is polyamino pyrene, polyacetylene, polyphenylene, polyphenylene vinylene, polyphenylene sulfide, polyphenylene oxide, polypyrrole, polythiophene, polyfuran or polyaniline having acidic radical. Preferred Layer: The light-emitting layer contains polymeric light-emitting component having repeating unit of formula: -Ar7-(Y1)k-, number average molecular weight of 1x103-1x107 by polystyrene conversion.Ar7=bivalent group having arylene group, bivalent heterocyclic group or metal-complex structure;Y1=-CR1=CR2- or -C?=C-;R1,R2=H, alkyl, aryl, univalent heterocyclic or cyano group;andk=0-2.The light-emitting layer contains hole-transport material, electron transport material and/or luminescent material. Preferred Composition: The solution composition contains conductive polymer (A) and polymer (B) at molar ratio of 5:1-1:20, and further polar solvent. Preferred Property: The thin film has light absorbency of 0.2 or less at wavelength of 400-800 nm. EXAMPLE - Sulfonated polyaniline aqueous solution (A1) was obtained using fuming sulfuric acid, emeraldin base polyaniline, methanol and sodium hydroxide aqueous solution. Polymer compound aqueous solution (A2) was obtained using Sumica excel PES5200P, fuming sulfuric acid and water. Sulfonated polyaniline aqueous solution (A1) and polymer compound aqueous solution (A2) were mixed at weight ratio of 1:2 to obtain liquid mixture. The liquid mixture was spin coated on substrate, and dried at 110degreesC for 10 minutes to form film (F1). Polymer (P1) having number average molecular weight of 4.6x104 and weight average molecular weight of 1.1x105, and polymer (P2) having number average molecular weight of 3.4x104 and weight average molecular weight of 5.4x104 were mixed, dissolved in toluene, spin coated on the resulting product, and dried to form film (F2). An organic electroluminescent element having films (F1,F2) was formed, and had initial-stage luminance of 240 cd/m2 at current density of 25 mA/cm2.