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Optimization of Orange-Emitting Electrophosphorescent Copolymers for Organic Light-Emitting Diodes†

  1. Andreas Haldi1,
  2. Alpay Kimyonok2,
  3. Benoit Domercq1,
  4. Lauren E. Hayden2,
  5. Simon C. Jones2,
  6. Seth R. Marder2,*,
  7. Marcus Weck2,3,*,
  8. Bernard Kippelen1,*

Article first published online: 22 SEP 2008

DOI: 10.1002/adfm.200800446

Issue

Advanced Functional Materials

Advanced Functional Materials

Volume 18, Issue 19, pages 3056–3062, October 9, 2008

Additional Information

How to Cite

Haldi, A., Kimyonok, A., Domercq, B., Hayden, L. E., Jones, S. C., Marder, S. R., Weck, M. and Kippelen, B. (2008), Optimization of Orange-Emitting Electrophosphorescent Copolymers for Organic Light-Emitting Diodes. Advanced Functional Materials, 18: 3056–3062. doi: 10.1002/adfm.200800446

Author Information

  1. 1

    School of Electrical and Computer Engineering, Center of Organic Photonics & Electronics (COPE) Georgia Institute of Technology Atlanta, GA 30332-0250 (USA)

  2. 2

    School of Chemistry and Biochemistry, Center of Organic Photonics & Electronics (COPE) Georgia Institute of Technology Atlanta, GA 30332-0400 (USA)

  3. 3

    Present address: Department of Chemistry and Molecular Design Institute, New York University, New York, NY 10003-6688, USA

*School of Chemistry and Biochemistry, Center of Organic Photonics & Electronics (COPE) Georgia Institute of Technology Atlanta, GA 30332-0400 (USA).

  1. †

    This material is based upon work supported in part by Solvay SA, by the STC Program of the National Science Foundation under Agreement Number DMR-0120967, and by the Office of Naval Research. We thank Chun Huang for assistance in the synthesis of compound 2, Dr. Yadong Zhang and Dr. Sushanta Pal for the synthesis of compound 9, and Dr. Stephen Barlow for critical reading of our manuscript.

Publication History

  1. Issue published online: 6 OCT 2008
  2. Article first published online: 22 SEP 2008
  3. Manuscript Revised: 27 JUN 2008
  4. Manuscript Received: 31 MAR 2008

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Keywords:

  • copolymers;
  • electroluminescence;
  • iridium;
  • organic electronics;
  • organic light-emitting diodes;
  • phosphorescence

Graphical Abstract

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Orange-emitting phosphorescent copolymers containing iridium complexes and bis(carbazolyl)fluorene groups in their side chains are employed as the emissive layer in multilayer organic light-emitting diodes. By varying the molecular weight and the iridium loading level of the copolymers, and by changing the linker between the side chains and the polymer backbone, an optimized efficiency of 4.9 ± 0.4% at 100 cd m−2 is achieved.

Abstract

Orange-emitting phosphorescent copolymers containing iridium complexes and bis(carbazolyl)fluorene groups in their side chains are employed as the emissive layer in multilayer organic light-emitting diodes (OLEDs). The efficiency of the OLED devices is optimized by varying characteristics of the copolymers: the molecular weight, the iridium loading level, and the nature and length of the linker between the side chains and the polymer backbone. A maximum efficiency of 4.9 ± 0.4%, 8.8 ± 0.7 cd A−1 at 100 cd m−2 is achieved with an optimized copolymer.

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