TECHNOLOGY FOCUS - POLYMERS - Preparation: No Preparation method is given. Preferred Compounds: The DA pi -conjugated polymer reflects a blue tinted green, deep green, or yellow tinted green color. The DA pi -conjugated polymer further comprising a PCBM as a blend; and an inorganic metal oxide as a blend. The PCBM is (6,6)-phenyl-C61-butyric acid methyl ester (PC6-0BM), (6,6)-phenyl-C71 -butyric acid methyl ester (PC70BM), or functionally equivalent substituted buckminsterfullerene. The PCBM is up to 95 wt.% of blend. Preferred Components: The D1 comprises 3,4-dioxythiophene, 3,4-dioxypyrrole, 3,4-dioxyfuran, 3,4-dioxyselenophene, or 3,4-dioxytelurophene, 3,4-alkylenedioxythiophene, 3,4-alkylenedioxypyrrole, 3,4- alkylenedioxyfuran, 3,4-alkylenedioxyselenophene, or 3,4-alkylenedioxytelurophene, where the solubilizing side chain is attached to an oxy group or any carbon of D1. The D1k comprises D12 with a pair of heterocyclic rings fused with a common substituent comprising a carbon, oxygen, nitrogen, sulphur or silicon bridge between rings, where solubilizing side chain is attached to any carbon, oxygen, nitrogen, sulphur or silicon of D12. The D1k comprises D12 as a fused cyclopentadithiophenc or a fused dithienosilole fused derivative, where the solubilizing side chain is attached to any carbon, oxygen, nitrogen, sulphur or silicon of D12. The side chain comprises branched or straight chained 3-30C alkyl, or alkylene, or alkylaryl where side chain is optionally interrupted or substituted with at least one functional groups such as hydroxy, amino, ether, ester, carbonyl, carboxylic acid cyano, or halo. The A comprises nitrogen-containing electron-accepting heterocycle. The nitrogen-containing electron-accepting heterocycle comprises benzothiadiazole, thiadiazoloquinoxaline, quinoxaline, thienothiadiazole, thienopyrazine, pyrazinoquinoxaline, benzobisthiadiazole or thiadiazolothienpyrazine, and where the nitrogen-containing electron-accepting heterocycle is optionally substituted. The D2 comprises an aromatic and heteroaromatic unit. The heteroaromatic unit comprises thiophene, pyrrole, furaii, selenophene, telurophene, 3,4-dihydroxythiophene, 3,4- dihydroxypyrrole, 3,4-dihydroxyfuran, 3,4-dihydroxy selenophene, 3,4-dihydroxytelurophene, 3,4-diphenoxythiophene, 3,4-diphenoxypyrrole, 3,4-diphenoxyfuran, 3,4-diphenoxyselenophene, 3,4-diphenoxytelurophene, 3,4-diethenyloxythiophene, 3,4-diethenyloxypyrrole, 3,4-diethenyloxyfuran, 3,4-diethenyloxyselenophene, 3,4- diethenyloxy telurophene, 3,4-diformyloxy thiophene, 3,4-diformyloxypyrrole, 3,4- diformyloxyfuran, 3,4-diformyloxyselenophene, 3,4-diformyloxytelurophene, 3,4-(1,2-vinylene)dioxythiophene, 3,4-(1,2-vinylene)dioxypyrrole, 3,4-(1,2-vinylene)dioxyfuran, 3,4-(1,2-vinylene)dioxy selenophene, 3,4-(1,2-vinylene)dioxytelurophene, 3,4-(1,2-phenylene)dioxythiophene, 3,4-(1,2-phenylene)dioxypyrrole, 3,4-(1,2-phenylene)dioxyfuran, 3,4-(1,2-phenylene)dioxyselenophene, 3,4-(1,2-phenylene)dioxytelurophene, 3,4-dicyanothiophene, 3,4-dicyanopyrrole, 3,4-dicyanofuran, 3,4-dicyanoselenophene, 3,4-dicyanotelurophene, 3,4-diaminothiophene, 3,4-diaminopyrrole, 3,4-diaminofuran, 3,4-diaminoselenophene, 3,4-diaminotelurophene, 3,4-dihalothiophene, 3,4-dihalopyrrole, 3,4-dihalofuran, 3,4-dihaloselenophene, 3,4-dihalotelurophene, thiophene-3,4-dicarboxylic acid, furan-3,4-dicarboxylic acid, selenophene-3,4-dicarboxylic acid, telurophene-3,4-dicarboxylic acid, 3,4-dihalothiophene, 3,4-dihalopyrrole, 3,4-dihalofuran, 3,4-dihaloselenophene, or 3,4- dihalotelurophene. The A comprises benzothiadiazole, D1 comprises dioxythiophenes having 3-30C alkyl groups and D2 comprises thiophene. EXAMPLE - No suitable example given.