Synthesis and characterization of poly(1,4-phenylenevinylene-alt-2,5-thienylenevinylene) derivatives for organic light-emitting diodes

Jin, Sung‐Ho; Hwang, Chan-Koo; Gal, Yeong‐Soon; Park, Dong-Kyu; Cho, Sung‐Jin; Shin, Dong-Myung; Lee, Jae‐Wook

doi:10.1016/j.eurpolymj.2004.03.028

Cited by 4 publications

References 13 publications

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Conjugated Polymers for Optoelectronic Applications

Liu

Cao

2008

Macromolecular Symposia

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Summary: Novel conjugated polymers containing carbazole, phenothiazine or triphenylamine units in the main chain were designed and synthesized via Wittig, Knovenagel or Heck condensations respectively. A majority of them have good solubility in common organic solvents, high thermal stability and good hole-injection ability. Their diluted solutions in THF showed strong absorption with the absorption maximum in the range of 294$470 nm and the optic band gaps located in the range of 1.90$2.75 eV. When irradiated by ultraviolet or visible light, the diluted solutions in THF of the polymers emitted light from purple to yellow color with the emission maximum in the range of 347$597 nm and the full width at half maximum located in the range of 59$119 nm. Several polymeric light-emitting diodes (PLEDs) devices were fabricated using these polymers as light-emitting materials, and a double-layer device composed of ITO/PEDOT:PSS/PQTN/Mg:Ag showed a good performance, in which the maximum brightness was measured as 2434.0 cd/m 2 under a 11.0 V forward bias voltage. Photovoltaic devices were also investigated using these polymers as an active layer, and a device composed of ITO/PNB/PTCDI-C 13 /Al showed a good performance, which was estimated to have external quantum efficiency at around 1% at 330 nm. From these preliminary experimental results, we may infer that these polymers are good light-emitting materials for PLEDs; while for photovoltaic applications, their absorption spectra need to be further improved to match the solar illumination.

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Conjugated Polymers for Optoelectronic Applications

Liu

Cao

2008

Macromolecular Symposia

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Synthesis and characterization of low‐band‐gap conjugated polymers containing phenothiazine and benzo‐2,1,3‐thia‐/seleno‐diazole

Xu¹,

Liu²,

Li³

et al. 2009

Polymers for Advanced Techs

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Two phenothiazine‐based conjugated polymers, poly(3, 7‐divinylene‐N‐octyl‐phenothiazine‐alt‐benzo‐2,1,3‐ thiadiazole) (PQS) and poly(3,7‐divinylene‐N‐octyl‐phenothiazine‐alt‐benzo‐2,1,3‐selenodiazole) (PQSe) were synthesized by Heck coupling reaction. The chemical structures of the two polymers were confirmed by 1H‐NMR and Ft‐IR. They showed good solubility in some common organic solvents such as tetrahydrofuran (THF), chloroform. The weight‐average molecular weight (Mw) of the polymers determined by GPC in THF against polystyrene standards was 3.7 × 103 for PQS and 1.9 × 103 for PQSe, respectively. The temperatures of 5% weight loss (T5) were 385.0°C for PQS and 324.0°C for PQSe, respectively, determined by TGA measurements under nitrogen ambience. UV–vis absorption spectra of the polymer films showed the absorption maxima at 537 nm for PQS and 539 nm for PQSe, with the full width at half maximum (FWHM) of 190 and 230 nm, respectively. The optical band gaps ($\mathop E\nolimits_g^{{\rm opt}}$) of the polymer films are 1.86 eV for PQS and 1.80 eV for PQSe, respectively. As the polymers have low‐band‐gap and broad absorption in the visible region, they may be used as potential light‐harvesting materials for photovoltaic devices (PVDs). Furthermore, photoluminescence (PL) spectra of the polymer solutions showed the emission maxima at 698 nm for PQS and 709 nm for PQSe, with FWHM of 152 nm and 167 nm, respectively, which revealed that these two polymers may be used as red and near infrared light‐emitting materials for polymeric light‐emitting diodes (PLEDs). Copyright © 2009 John Wiley & Sons, Ltd.

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