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Issue 11, 2015
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Fluorene co-polymers with high efficiency deep-blue electroluminescence

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Abstract

Two new deep blue emitting co-polymers are synthesised and exploited in highly-efficient solution-processed polymer light-emitting diodes (PLEDs). A key molecular design feature is selective functionalisation of 9,9-diphenylfluorene to disrupt backbone π-conjugation, thereby promoting luminescence from short emissive domains (λELmax 422 and 401 nm for P1 and P2 devices, respectively). PLEDs using P1 and P2 in the hybrid architecture ITO/PEDOT:PSS/polymer/TPBi/LiF/Al show low turn-on voltages and remarkably high EQE values of ηext,max 3.3%, Lmax of 167 cd m−2 with CIExy coordinates (0.17, 0.10) for P1; and 3.9%, 274 cd m−2, CIExy (0.17, 0.07) for P2. These performances are currently among the best for PLEDs with CIEy ≤ 0.10.

Graphical abstract: Fluorene co-polymers with high efficiency deep-blue electroluminescence

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Publication details

The article was received on 02 Dec 2014, accepted on 25 Jan 2015 and first published on 04 Feb 2015


Article type: Paper
DOI: 10.1039/C4TC02766C
Citation: J. Mater. Chem. C, 2015,3, 2479-2483
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    Fluorene co-polymers with high efficiency deep-blue electroluminescence

    J. Santos, J. H. Cook, H. A. Al-Attar, A. P. Monkman and M. R. Bryce, J. Mater. Chem. C, 2015, 3, 2479
    DOI: 10.1039/C4TC02766C

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