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Mikroyannidis, John A.,Yu, Young-jun,Lee, Seung-hun,Jin, Jung-il Wiley Subscription Services, Inc., A Wiley Company 2006 Journal of polymer science Part A, Polymer chemist Vol.44 No.15
<P>Three new poly(fluorenevinylene) derivatives were synthesized, characterized, and used as emissive materials in light-emitting diodes (LEDs). They were synthesized by Heck coupling of 9,9-dihexyl-2,7-divinylfluorene with 2,7-dibromo-9,9-dihexylfluorene, 2,3-bis(4-bromophenyl)quinoxaline, or 2,5-bis(4-bromophenyl)-3,4-diphenylthiophene to afford the polymers F, Q, and T, respectively. Polymers F and Q had medium number–average molecular weights (M<SUB>n</SUB> ˜ 14,000) with relatively narrow polydispersity (1.3–1.6), while T was obtained as an oligomer (M<SUB>n</SUB> ˜ 4000). All polymers were soluble in common organic solvents, such as tetrahydrofuran (THF), chloroform, dichloromethane, and toluene. They emitted blue-greenish fluorescence light in dilute THF solution (444–491 nm), with photoluminescence (PL) quantum yields of 0.32–0.54, and in thin film (453–488 nm). LEDs with the configuration of ITO/PEDOT-PSS/Polymer/Li:Al were fabricated and evaluated. The electroluminescence (EL) spectra of the Q and F polymers were very broad covering the blue–green–red region, whereas the spectrum of the polymer T was almost purely blue. The threshold electrical field for light emission of the devices was almost the same (˜1.75 MV/cm). The external quantum efficiency of the devices of polymers Q and F was about 1.0 × 10<SUP>−3</SUP>%, whereas that of polymer T was ˜3.0 × 10<SUP>−5</SUP>%. The fluorescence lifetime of polymers F and Q was significantly longer than that of the polymer T. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 4494–4507, 2006</P> <B>Graphic Abstract</B> <P>Soluble poly(fluorenevinylene) derivatives F, Q, and T were synthesized by Heck coupling. They emitted blue-greenish light both in solution and in thin film, with photoluminescence emission maximum at 444–491 nm. Light emitting diodes with the configuration ITO/PEDOT-PSS/Polymer/Li:Al emitted light covering the blue–green–red region for the polymers F and Q, whereas this device emitted almost pure blue light for the polymer T. <img src='wiley_img/0887624X-2006-44-15-POLA21542-gra001.gif' alt='wiley_img/0887624X-2006-44-15-POLA21542-gra001'> </P>
Yu, Young-Jun,Kwon, Young-Wan,Kim, Kyu-Nam,Do, Eui-Doo,Choi, Dong-Hoon,Jin, Jung-Il,Shin, Hee-Won,Kim, Yong-Rok,Kang, Ik-Joong,Mikroyannidis, John A. The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.4
A fluorescing, copolymer(Q)-bearing, quaternary ammonium pendant was mixed with excess natural salmon sperm DNA with a molecular weight of $1.3{\times}10^6$(2,000 base pairs) to afford highly fluorescing, complex mixtures. The fluorescence life-time of the polymer Q was greatly increased when mixed with DNA: for the mixture of Q:DNA=1:750 the fast and slow decay lifetimes increased from ca. 10 to 100 ps and from 20 ps to ca. 1 ns, respectively. The enhanced fluorescence of the mixtures was ascribed to efficient compartmentalization and reduced conformational relaxation of the polymer Q by complexation with excess DNA.