Synthesis, characterization, and application of light-emitting copolyfluorenes slightly doped with distyrylbenzene derivatives

Chiung Feng Liao, Bar Yuan Hsieh, Yun Chen

研究成果: Article同行評審

5 引文 斯高帕斯(Scopus)

摘要

Copolyfluorenes PFG1∼PFG4 slightly doped with 0.006-0.5 mol % of 2,5-dihexyloxy-1,4-bis(2-phenyl-2-cyanovinyl)benzene (green chromophore) were synthesized by the Suzuki coupling reaction to be evaluated as hosts for white-light electroluminescent (EL) devices. Their optical, thermal and electrochemical properties were almost identical to those of polyfluorene (PF) due to minimal chromophore content. However, the electroluminescent (EL) spectra of the PFGn were very different from photoluminescence spectra in film state. Relative intensity of green emission (ca. 521 nm) in EL spectra are much stronger than those in PL spectra, which can be attributed to charges trapping in the chromophores due to its narrow band gap (Eg ≈2.56 eV). The performance of EL devices [ITO/PEDOT:PSS/polymer/Ca (50 nm)/Al (100 nm)] were improved with an increase in chromophore content. The PFG4 device revealed the best performance (6790 cd/m2, 1.69 cd/A), and the PFG1 and PFG2 devices exhibited comparable intensity in blue and green emissions. Blend EL devices were fabricated by using the PFGn as the hosts and a red iridium complex [Ir(piq)2(acac)] as dopant. By controlling the amount of the iridium complex, the white-light emitting device was achieved with PFG2, with maximum brightness and CIE coordinate being 4120 cd/m2 and (0.31, 0.28), respectively.

原文English
頁(從 - 到)149-160
頁數12
期刊Journal of Polymer Science, Part A: Polymer Chemistry
47
發行號1
DOIs
出版狀態Published - 2009 一月 1

All Science Journal Classification (ASJC) codes

  • 聚合物和塑料
  • 有機化學
  • 材料化學

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