TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The chromophore is substituted benzotriazole compounds of formula (Ia), (Ib), (IIa) or (IIb), substituted benzotriazole phenyl compounds of formula (IIIa) or (IIIb), substituted fused heterocyclic compounds of formula (IV), trifluoromethyl phenyl substituted perylene-3,9-dicarboxylic acid ester compounds of formula (Va) or cyano substituted perylene-3,9-dicarboxylic acid ester compounds of formula (Vb). The encapsulation structure (I) comprises at least two chromophores. The chromophore is present at 0.01-3 wt.% in the polymer matrix. The luminescent wavelength conversion material further comprises: at least one sensitizer; at least one plasticizer; and UV stabilizer, antioxidant and/or absorber. The sensitizer is fullerene (preferred), phthalocyanine, perylene, porphyrin or terylene (all optionally substituted). The sensitizer is present at 0.01-5 wt.% based on the total weight of the luminescent wavelength conversion material. The sensitizer comprises nanoparticles, nanometals, nanowires or carbon nanotubes. The plasticizer is N-alkyl carbazole derivatives or triphenylamine derivatives. The encapsulation structure (I) further comprises: at least one of glass sheet, reflective back sheet, edge sealing tape, frame material, polymer encapsulation material or adhesive layer to adhere additional layers to the system; and an additional polymer layer containing UV absorber. The encapsulation structure (II) further comprises a sealing tape around the perimeter of the solar energy conversion device.j = 0-100;A0, A1 = (hetero)alkyl, alkenyl, (hetero)aryl, amino, amido, cyclic amido, cyclic imido, alkoxy, carboxy or carbonyl (all optionally substituted);A2 = alkylene, alkenylene or (hetero)arylene (all optionally substituted), ketone, ester or bis(aryl amino carbonyl) moiety of formula (-Ar1-N(R1)-C(=O)-R2-C(=O)-N(R1)-Ar1-);Ar1 = (hetero)aryl (optionally substituted); eitherR1 = H, alkyl, alkenyl, (hetero)aryl, aralkyl or alkaryl; andR2 = alkylene, alkenylene or (hetero)arylene (all optionally substituted), ketone or ester;R1R2 = ring;D1, D2 = alkoxy, aryloxy, acyloxy, alkyl, (hetero)aryl or amino (all optionally substituted), H, amido, cyclic amido or cyclic imido;L1 = alkylene, alkenylene, alkynylene or (hetero)arylene (all optionally substituted);R4 = R21-N(-)-C(=O)-R3 or cyclic imido (optionally substituted); eitherR21 = H, alkyl, alkenyl, (hetero)aryl, aralkyl or alkaryl; andR3 = alkyl, alkenyl or (hetero)aryl (all optionally substituted); orR21R3 = ring;R22 = alkylene, alkenylene or (hetero)arylene (all optionally substituted);A10, A11 = (hetero)alkyl, alkenyl, amido, alkoxy, carbonyl or carboxy (all optionally substituted);R5 = alkoxy, aryloxy or acyloxy (all optionally substituted) or amino;Z, Z1 = -O-, -S-, -Se-, -Te-, -NR6-, -CR6=CR6- or -CR6=N-;R6 = 1-6C alkyl or 1-10C aryl (both optionally substituted) or H;D3, D4 = alkoxy, aryloxy, acyloxy, alkyl, (hetero)aryl or amino (all optionally substituted), amido, cyclic amido or cyclic imido;i, k = 0-2;Y1, Y2 = aryl, alkyl, cycloalkyl, alkoxy or amino (all optionally substituted);R31, R31a = H, 1-10C alkyl, 3-10C cycloalkyl, 1-10C alkoxy, 6-18C aryl or 6-20C aralkyl;m, n = 1-5; andR32, R32a = 6-18C aryl or 6-20C aralkyl.Provided that D1, D2 are not both H.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The optically transparent polymer matrix comprises at least one polymer, which is polyethylene terephthalate, polymethyl methacrylate, polyvinyl butyral, ethylene vinyl acetate, ethylene tetrafluoroethylene, polyimide, amorphous polycarbonate, polystyrene, siloxane sol-gel, polyurethane and/or polyacrylate. The refractive index of the polymer matrix material is 1.4-1.7. The environmental protective cover comprises glass or plastic layers. EXAMPLE - 20 wt.% Polyvinyl butyral (PVB) polymer solution with dissolved polymer powder in cyclpentanone was prepared. The PVB polymer solution was mixed with (4-tert-butyl-phenyl)-(4-((4-(7-(4-diphenylamino-phenyl)-benzo(1,2,5)thiadiazol-4-yl)-phenyl)-phenyl-amino)-phenyl)-methanone at a weight ratio of 0.3 wt.% to obtain a chromophore containing polymer solution. The dye-containing polymer solution was directly casted onto a glass substrate, heat treated up to 100 degrees C in 2 hours, and the remaining solvent was completely removed by further vacuum heating at 130 degrees C overnight to form the dye/polymer film. The dye/polymer film was peeled off under the water and then dried out the free-standing polymer film before use. After the film was dried out, it was hot pressed into a luminescent wavelength conversion sheet of 500 mu M thickness. The luminescent wavelength conversion sheet, a commercial 5 inch monocrystalline silicon solar cell and pure PVB polymer encapsulate were laminated onto an 3 mm thick glass sheet in vacuum at 130 degrees C with the luminescent wavelength conversion sheet as the front surface. The output of the solar cell was measured before and after lamination and relative improvement of 12.5% was achieved.