TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The photoactive organic polymer is polythiophenes such as poly(3-hexylthiophene) (P3HT), poly(3-octylthiophene), and/or poly(3,4-ethylenedioxythiophene); polyphenylenevinylenes such as poly(2-methoxy-5- 2-ethylexyloxy)-1, 4-phenylenevinylene, and/or poly(paraphenylenevinylene) (poly(2-methoxy-5-(3, 7-dimethyloctyloxy)-1, 4-phenylene)-alt-vinylene) (MDMO-PPV); alternating conjugated copolymers comprising naphthalenediimide units having formula (I), and at least one electron-donor conjugated structural unit, where unit naphthalenediimide unit is connected to electron-donor conjugated structural unit, in the alternating copolymer, in any of the positions 2, 3, 6 or 7; alternating or statistical conjugated copolymers comprising at least one benzotriazole unit having formula (Ia) or (Ib), and at least one conjugated structural unit, where each benzotriazole unit is connected to at least one conjugated structural unit in any positions 4,5, 6 or 7, preferably 4 or 7; alternating ~p-conjugated polymers comprising at least one fluoroarylvinylidene electron-acceptor unit having formula (III), and at least one conjugated electron-donor structural unit connected to the electron-acceptor unit in the points indicated by dashed lines in compound (III); copolymers based on acridane units comprising monomeric unit having formula (IV) and at least one monomeric unit having formula (V'), where compound (V') is connected to any position available of heteroaromatic side ring of compound (V') through one of the two positions indicated by dashed lines in compound (V'); alternating conjugated copolymers comprising benzothiadiazole units such as (poly(N- 9"-heptadecanyl-2, 7-carbazole-alt-5, 5- (4',7' di-2-thienyl-2',1' ,3'-benzothiadiazole)) (PCDTBT), and (poly(2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta-(2,1-b;3,4-b' )-dithiophene)-al-4,7-(2,1,3-benzothiadiazole))) (PCPDTBT); alternating conjugated copolymers comprising thieno(3,4-b)pyrazine units; alternating conjugated copolymers comprising quinoxaline units; alternating conjugated copolymers comprising silole monomeric units such as copolymers of 9,9-dialkyl-9-silafluorene; and alternating conjugated copolymers comprising condensed thiophene units such as copolymers of thieno(3,4-b)thiophene and benzo(1,2-b:4,5-b') dithiophene. The photoactive organic polymer is preferably poly'(3-hexylthiophene) or from 1 or more of 11 polymers e.g. of formulae (Ix), (Iy) and/or (Iz). The hindered amines are selected from one or more of 14 compounds, e.g. of formulae (V), (VI) and (X). The triazines are selected from compounds of formula (XXIII). The benzoxazinones are selected from those having formula (XXIV). The benzotriazoles are selected from those compounds having formula (XXV). The benzophenones are selected from those compounds having formula (XXVI). The benzoates are selected from those compounds having formula (XXVII). The formamidines are selected from those compounds having formula (XXVIII). The propenoates are selected from those compounds having formula (XXIX). The aromatic propanediones are selected from those compounds having formula (XXX). The benzoimidazoles are selected from those having compounds having formula (XXXI). The cycloaliphatic ketones are selected from those compounds having formula (XXXII). The formanilides including oxamides are selected from those compounds having formula (XXXIII). The cyanoacrylates are selected from those compounds having formula (R''''''''''2)(R''''''''''3)-C=C(CN)-C(=O)-O-R''''''''''1 (XXXIV). The benzopyranones are selected from those compounds having formula (XXXV). The salicylates are selected from those compounds having formula (XXXVI).R, R'=linear or branched 1-36C alkyl, aryl (optionally substituted by 1-24C alkyl);R''=alkyl, aryl, acyl or thioacyl (optionally substituted);X1-X5=H, F, or 1-12, preferably 1-4C alkyl (on the condition that at least one of substituents X1-X5 is F, or -CF2R''');R'''=H, F, or 1-10C hydrocarbons (optionally fluorinated);X=S or Se;Y'=O, S, NR'''';R''''=1-24C organic substituents selected from alkyl, aryl, acyl, and thioacyl (alkyl is optionally substituted );Z'=O, S, Se, or -NR''''';R'''''=1-24C organic substituent selected from alkyl, aryl, acyl and thioacyl groups (alkyl and aryl groups are optionally substituted);R''''''=1-20C alkyl;n=2-500;R3-R6=H, 1-22 alkyl, 3-8C cycloalkyl, heteroaryl, or aryl (alkyl, cycloalkyl, heteroaryl, and aryl are optionally substituted);R7=H, -OR6, 1-22C alkyl, or 3-8C cycloalkyl (alkyl and cycloalkyl are optionally substituted);R8=H, 1-22C alkyl, 3-8C cycloalkyl, heteroaryl, or aryl (alkyl, cycloalkyl, heteroaryl, and aryl are optionally substituted), -Y1-R1, or succinimide groups of formula (XIX);R9, R10=H, 1-22C alkyl, or 3-8C cycloalkyl (alkyl and cycloalkyl are optionally substituted); orR9+R10=divalent group forming ring with N atom to which they are bound, e.g. morpholine and piperidine;L1=divalent connecting group selected from 2-22C alkylene, and -(CH2CH2-Y1)1-3-CR2CH2-, 3-8C cycloalkylene, arylene and -CO-L2-OC-;R1, R2=H, 1-22C alkyl, 3-8C cycloalkyl, heteroalkyl, or aryl (alkyl, cycloalkyl, heteroalkyl, or aryl is optionally substituted);L2=2-22C alkylene, arylene, -(CH2CH2-Y1)1-3-CH2CH2-, or 3-8C cycloalkylene;Y1=-OC(O)-, -NHC(O)-, -O-, -S-, -N(R1)-;R'1, R''1, R'''3, R'''4=H or OH;R'2, R''''''4=H, or alkoxy;R'3, R'5=H or alkyl;R'4=H, alkyl, or alkylester;R'6=H, or alkylester;R''2=alkyl, hydroxyalkyl, acryloxyalkyl, (hydroxyphenyl) alkyl, (alkylester) alkyl, (hydroxyalkylether)-oxoalkyl, or phenylalkyl;X'=Cl or Br;R1'''=OH, alkoxy, alkoxyester, alkenoic acids, aryloxy, hydroxyalkoxy, hydroxy (alkylether) alkoxy, alkoxyester-(acrylo-polymerized), groups deriving from esters of o-alkyl acids;R'''2=H, OH, -SO3H, or -SO3Na;R'''5=H or -SO3Na;R''''1=hydroxyalkylether, alkylphenyl, alkyl, Ph, or hydroxyphenyl;R''''2=H, OH, alkyl, or hydroxy(alkylether)amine;R''''3=H, OH or alkyl;R''''4=H or alkyl;R'''''1, -R'''''2, R''''''1, R'''''''2, R''''''''1, R'''''''''1=alkyl;R''''''2=CN, or alkylester;R''''''3, R''''''''''3, R''''''''''3=H or Ph;R'''''''1=alkoxy;R'''''''''2=H, formanilide, alkylalkoxyl, or groups containing benzimidazoles;R''''''''''1, R'''''''''''1=alkyl or arylcyanoacrylalkyl;R''''''''''2=H, Ph, indoline, or alkyl;R'''''''''''2=H, Ph or indoline;R''''''''''''1-R''''''''''''4=OH; andR'''''''''''''1=linear, branched or cyclic alkyl.N.B: R3'' is not defined EXAMPLE - No suitable example given.