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Issue 37, 2017
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Highly efficient single-layer blue polymer light-emitting diodes based on hole-transporting group substituted poly(fluorene-co-dibenzothiophene-S,S-dioxide)

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Abstract

We developed a series of high-performance blue light-emitting polymers that contain hole-transport moieties comprising carbazole or triphenylamine substituents in the side chains of random copolymer poly(fluorene-co-dibenzothiophene-S,S-dioxide) (PFSO). The incorporation of these hole-transport species had negligible effects on the optical properties of the polymers but obviously facilitated hole injection from the anode, leading to significant improvements in hole/electron flux in the emissive layer. Interestingly, the copolymers that comprised either carbazole or triphenylamine substituents exhibited dramatically enhanced luminous efficiencies compared with the original copolymer. A PFSO-T5-based device yielded an excellent luminous efficiency of 7.04 cd A−1 at a brightness of 1000 cd m−2 with CIE coordinates of (0.16, 0.18), the highest efficiency reported so far for blue light-emitting polymers based on single-layer devices. The electroluminescent spectra of the PFSO-T5-based device exhibited excellent stability, as evidenced by a lack of change as the driving voltage increased from 4 to 8 V. These results indicate that the introduction of a hole-transporting group in the side chain is a very promising strategy for the development of highly efficient blue polymers for single-layer devices.

Graphical abstract: Highly efficient single-layer blue polymer light-emitting diodes based on hole-transporting group substituted poly(fluorene-co-dibenzothiophene-S,S-dioxide)

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Publication details

The article was received on 07 Jun 2017, accepted on 18 Aug 2017 and first published on 18 Aug 2017


Article type: Paper
DOI: 10.1039/C7TC02515G
Citation: J. Mater. Chem. C, 2017,5, 9680-9686
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    Highly efficient single-layer blue polymer light-emitting diodes based on hole-transporting group substituted poly(fluorene-co-dibenzothiophene-S,S-dioxide)

    F. Peng, N. Li, L. Ying, W. Zhong, T. Guo, J. Cui, W. Yang and Y. Cao, J. Mater. Chem. C, 2017, 5, 9680
    DOI: 10.1039/C7TC02515G

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