Article

Synthesis and characterization of color-stable electroluminescent polymers: Poly(dinaphtho[1,2-a:1′,2′-g]-s-indacene)s

  1. Xin Guo1,2,
  2. Bing Yao1,
  3. Guoxin Jiang1,2,
  4. Yanxiang Cheng1,
  5. Zhiyuan Xie1,*,
  6. Lixiang Wang1,*,
  7. Xiabin Jing1,
  8. Fosong Wang1

Article first published online: 11 JUN 2008

DOI: 10.1002/pola.22821

Issue

Journal of Polymer Science Part A: Polymer Chemistry

Journal of Polymer Science Part A: Polymer Chemistry

Volume 46, Issue 14, pages 4866–4878, 15 July 2008

Additional Information

How to Cite

Guo, X., Yao, B., Jiang, G., Cheng, Y., Xie, Z., Wang, L., Jing, X. and Wang, F. (2008), Synthesis and characterization of color-stable electroluminescent polymers: Poly(dinaphtho[1,2-a:1′,2′-g]-s-indacene)s. Journal of Polymer Science Part A: Polymer Chemistry, 46: 4866–4878. doi: 10.1002/pola.22821

Author Information

  1. 1

    State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China

  2. 2

    Graduate School of the Chinese Academy of Sciences, Beijing 100039, People's Republic of China

*State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China

Publication History

  1. Issue published online: 11 JUN 2008
  2. Article first published online: 11 JUN 2008
  3. Manuscript Accepted: 18 APR 2008
  4. Manuscript Received: 21 AUG 2007

Funded by

  • National Natural Science Foundation of China. Grant Numbers: 20574067, 50633040
  • Creative Research Groups. Grant Number: 20621401
  • 973 Project. Grant Number: 2002CB613402

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Keywords:

  • color stability;
  • conjugated polymers;
  • light-emitting diodes;
  • luminescence

Graphical Abstract

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Two novel electroluminescent (EL) polymers with same backbone poly(dinaphtho[1,2-a:1′,2′-g]-s-indacene) and different side chains have been synthesized and characterized. They have extended conjugation along the direction perpendicular to the backbone by introducing naphthalene moieties, which result in stable film morphology. The emission of both polymers in film state is strongly dependent on the substituents. The new broad-bandgap polymer with high EL efficiency and spectral stability can be used not only as an efficient EL material, but also as a host material for constructing polymers to emit low- energy light or white light. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

Abstract

Two new stepladder conjugated polymers, that is, poly(7,7,15,15-tetraoctyldinaphtho[1,2-a:1′,2′-g]-s-indacene) (PONSI) and poly(7,7,15,15-tetra(4-octylphenyl)dinaphtho[1,2-a:1′,2′-g]-s-indacene) (PANSI) with alkyl and aryl substituents, respectively, have been synthesized and characterized. In comparison with poly(indenofluorene)s, both polymers have extended conjugation at the direction perpendicular to the polymer backbone because of the introduction of naphthalene moieties. The emission color of the polymers in film state is strongly dependent on the substituents. While PONSI emits at a maximum of 463 nm, PANSI with the same backbone but aryl substituents displays dramatically redshifted emission with a maximum at 494 nm. Both polymers show stable photoluminescence spectra while annealing at 200 °C in inert atmosphere. The PONSI-based devices with the configuration of ITO/PEDOT:PSS/polymer/Ca/Al turn on at 3.7 V, and emit at a maximum of 461 nm with the CIE coordinates of (0.19, 0.26), a maximum luminance efficiency of 1.40 cd/A, and a maximum brightness of 2036 cd/m2 at 13 V. Meanwhile, the emission color of the devices is independent of driving voltage and keeps unchanged during the continuous operation. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 4866–4878, 2008

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