Issue 4, 2017

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

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

Supplementary files

Article information

Article type
Paper
Submitted
15 ذو الحجة 1437
Accepted
03 ربيع الأول 1438
First published
06 ربيع الأول 1438

J. Mater. Chem. C, 2017,5, 817-823

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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