A new series of copolymers with high brightness and luminance efficiency were synthesized using the Gilch polymerization method, and their electro-optical properties were investigated. The weight-average molecular weights (M w ) and polydispersities of the synthesized poly(9,9-dioctylfluorenyl-2,7-vinylene) [poly(FV)], poly[2-(3-dimethyldodecylsilylphenyl)-1,4-phenylenevinylene] [poly(m-SiPhPV)], and poly[9,9-di-n-octylfluorenyl-2,7-vinylene]-co-(2-(3-dimethyldodecylsilylphenyl)-1,4-phenylene vinylene)] [poly(FV-co-m-SiPhPV)] were found to be in the ranges of (8.7-32.6) Â 10 4 and 2.3-5.4, respectively. It was found that the electro-optical properties of the copolymers could be adjusted by controlling the feed ratios of the comonomers. Thin films of poly(FV), poly(m-SiPhPV), and poly(FV-co-m-SiPhPV) were found to exhibit photoluminescence quantum yields between 21% and 42%, which are higher than those of MEH-PPV. Light-emitting diodes were fabricated in ITO/PEDOT/light-emitting polymer/cathode configurations using either double layer (LiF/Al) or triple layer (Alq 3 /LiF/Al) cathode structures. The performance of the polymer light-emitting diodes (PLEDs) with triple layer cathodes was found to be better than that of the PLEDs with double layer cathodes in poly(FV) and poly(FV-co-m-SiPhPV). The turnon voltages of the PLEDs were in the range of 4.5-6.0 V, with maximum brightness and luminance efficiency up to 9691 cd/m 2 at 16 V and 3.27 cd/A at 13 V, respectively.
N,N 0 -Di(1-nonadecyl)perylene-3,4:9,10-bis(dicarboximide) (PDI-C9) based bulkheterojunction photovoltaic devices increased the power conversion efficiency (PCE) with increasing PDI-C9 concentration and showed the highest incident photon-to-current conversion efficiency (IPCE) of 19% at 495 nm and PCE of 0.18% under AM 1.5 (100 mW=cm 2 ) have been achieved with 1:4 ratio of P3HT: PDI-C9. 1,7-Bis(N-pyrrolidinyl)-N,N 0 -dicyclohexyl-3,4:9,10-perylenebis(dicarboximide) (5-PDI-DI) based devices showed best performance of 9% IPCE at 525 nm 59 and 0.18% (AM 1.5) PCE at 1:1 blend ratio of P3HT: 5-PDI-DI and the PCEs were drastically decreased by increasing 5-PDI-DI ratio.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.