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Conjugated Polymers for Optoelectronic Applications
Author(s) -
Xu Shengang,
Liu Yingliang,
Cao Shaokui
Publication year - 2008
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200851019
Subject(s) - materials science , polymer , pedot:pss , triphenylamine , optoelectronics , carbazole , electroluminescence , oled , conjugated system , active layer , absorption (acoustics) , polyfluorene , polymer solar cell , quantum efficiency , absorption spectroscopy , photochemistry , layer (electronics) , optics , solar cell , nanotechnology , chemistry , composite material , thin film transistor , physics
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.