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Issue 4, 2017
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Solution-processed vanadium oxide as an efficient hole injection layer for quantum-dot light-emitting diodes

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Abstract

PEDOT:PSS (polyethylene dioxythiophene:polystyrenesulfonate) is widely used as a hole injection layer (HIL) for various optoelectronic devices because of its high conductivity and high work-function. However, the acidic and hygroscopic nature of PEDOT:PSS are detrimental to the long-term stability of the devices. In this work, we develop a solution processed vanadium pentoxide (V2O5) as an alternative to the PEDOT:PSS. The sol–gel derived V2O5 is easily obtained by spin-coating the vanadium oxytriisopropoxide solution, followed by thermal annealing at 120 °C for 1 min. With the proposed V2O5 HIL, quantum dot light-emitting diodes (QLEDs) exhibit a maximum current efficiency of 10.91 cd A−1 and a peak EQE of 7.25%, which are very close to those of devices with a conventional PEDOT:PSS HIL. Moreover, by substituting the problematic PEDOT:PSS with the inorganic V2O5, the stability/lifetime of the QLEDs is substantially improved. Our results demonstrate that the sol–gel derived V2O5 is an effective alternative to PEDOT:PSS for efficient, low cost and stable QLED devices.

Graphical abstract: Solution-processed vanadium oxide as an efficient hole injection layer for quantum-dot light-emitting diodes

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Publication details

The article was received on 16 Sep 2016, accepted on 02 Dec 2016 and first published on 05 Dec 2016


Article type: Paper
DOI: 10.1039/C6TC04050K
Citation: J. Mater. Chem. C, 2017,5, 817-823
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    Solution-processed vanadium oxide as an efficient hole injection layer for quantum-dot light-emitting diodes

    H. Zhang, S. Wang, X. Sun and S. Chen, J. Mater. Chem. C, 2017, 5, 817
    DOI: 10.1039/C6TC04050K

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