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• W2087680617 startingPage "6764" @default.
• W2087680617 abstract "A series of silyl- and alkoxy-substituted poly(p-phenylenevinylene) related copolymers containing carbazole and fluorene groups, poly[9,9-n-dihexyl-2,7-fluorenediylvinylene-alt-2,5-bis(trimethylsilyl)-p-phenylenevinylene] (PFBTS−PPV), poly[N-ethylhexyl-3,6-carbazolevinylene-alt-2,5-bis(trimethylsilyl)-p-phenylenevinylene] (PCBTS−PPV), poly[9,9-n-dihexyl-2,7-fluorenediyl-vinylene-alt-2-methoxy-5-(2-ethylhexyloxy)-p-phenylenevinylene] (PFMEH−PPV), and poly[N-ethylhexyl-3,6-carbazolevinylene-alt-2-methoxy-5-(2-ethylhexyloxy)-p-phenylenevinylene] (PCMEH−PPV), have been synthesized through the well-known Wittig polycondensation reaction. The synthesized polymers were completely soluble in common organic solvents and exhibited good thermal stability up to 400 °C. They showed UV−vis absorbance and photoluminescence (PL) in the ranges of 355−430 and 480−540 nm, respectively. The maximum emission peaks of dialkoxy-substituted PCMEH−PPV and PFMEH−PPV appeared at 520 and 540 nm, respectively, which were both blue-shifted about 55−75 nm compared to that of MEH−PPV. Especially, PCBTS−PPV and PFBTS−PPV showed much more blue-shifted emission maximum peaks at 480 and 495 nm corresponding to the blue and greenish-blue lights, respectively. Although PCBTS−PPV and PFBTS−PPV consist of conjugated segments without any kinked linkages, they showed far more blue-shifted emissions compared with other PPV related copolymers due to little electron-donating effect of the silyl substituent. Moreover, PFBTS−PPV and PCBTS−PPV showed extremely high PL efficiencies. Surprisingly, the PLeff (Φ = 0.81) of PFBTS−PPV is one of the highest values among the currently reported solid film PLeff of PPV derivatives. The single-layer light-emitting diode was fabricated in the configuration of ITO (indium−tin oxide)/polymer/Al. Electroluminescence (EL) maxima of PCBTS−PPV and PFBTS−PPV were shown at 480 and 500 nm, respectively, each corresponding to the blue and greenish-blue emission. The measurement of current vs electric field strength showed the threshold biases of PCBTS−PPV and PFBTS−PPV to be about 1.8 × 108 and 1.2 × 108 V/m, and PCBTS−PPV and PFBTS−PPV showed 13 and 32 times higher relative EL quantum efficiencies compared to that of MEH−PPV." @default.
• W2087680617 created "2016-06-24" @default.
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• W2087680617 date "2000-08-10" @default.
• W2087680617 modified "2023-10-04" @default.
• W2087680617 title "Highly Photoluminescent and Blue-Green Electroluminescent Polymers: New Silyl- and Alkoxy-Substituted Poly(<i>p</i>-phenylenevinylene) Related Copolymers Containing Carbazole or Fluorene Groups" @default.
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• W2087680617 doi "https://doi.org/10.1021/ma000449c" @default.
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