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High efficient light-emitting diodes using polystyrene as matrix

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Chinese Science Bulletin

Abstract

High efficient polymer light-emitting diodes (PLEDs) were obtained by using a blend of conjugated polymer G-PF, a copolymer of fluorene and thiophene, and polystyrene (PS). The maximum electroluminescent (EL) efficiency of the device is 12 cd/A when G-PF/PS weight ratio is at 80/20, while that of pure G-PF device is 6.5 cd/A. Studies on photoluminescence and electroluminescence of the blends indicate that inter-chain interactions were tremendously suppressed due to the dilution effect. However, after PS concentration exceeds 20% the EL efficiency of the devices decreases with further increase of PS concentration. This may be due to the decrease of the recombination probability of electrons and holes with the excessive addition of PS insulator.

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Authors and Affiliations

  1. Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, China

    Gufeng He & Yongfang Li

  2. Department of Materials Science and Engineering, University of California at Los Angeles, Los Angeles, CA, 90095, USA

    Jie Liu & Yang Yang

Authors
  1. Gufeng He
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  2. Jie Liu
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  3. Yang Yang
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  4. Yongfang Li
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Correspondence to Yongfang Li.

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He, G., Liu, J., Yang, Y. et al. High efficient light-emitting diodes using polystyrene as matrix. Chin.Sci.Bull. 48, 853–855 (2003). https://doi.org/10.1007/BF03325662

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  • DOI: https://doi.org/10.1007/BF03325662

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