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Issue 14, 2018
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Full-color capable light-emitting diodes based on solution-processed quantum dot layer stacking

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Abstract

To date, most of the studies on quantum dot-light-emitting diodes (QLEDs) have been dedicated to the fabrication of high-efficiency monochromatic devices. However, for the ultimate application of QLEDs to the next-generation display devices, QLEDs should possess a full-color emissivity. In this study, we report the fabrication of all-solution-processed full-color-capable white QLEDs with a standard device architecture, where sequentially stacked blue (B)/green (G)/red (R) quantum dot (QD)-emitting layers (EMLs) are sandwiched by poly(9-vinylcarbazole) as the hole transport layer and ZnO nanoparticles (NPs) as the electron transport layer. To produce interlayer mixing-free, well-defined B/G/R QD layering assemblies via successive spin casting, an ultrathin ZnO NP buffer is inserted between different-colored QD layers. The present full-color-capable white QLED exhibits high device performance with the maximum values of 16 241 cd m−2 for luminance and 6.8% for external quantum efficiency. The promising results indicate that our novel EML design of ZnO NP buffer-mediated QD layer stacking may afford a viable means towards bright, efficient full-color-capable white devices.

Graphical abstract: Full-color capable light-emitting diodes based on solution-processed quantum dot layer stacking

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Publication details

The article was received on 12 Jan 2018, accepted on 10 Mar 2018 and first published on 14 Mar 2018


Article type: Communication
DOI: 10.1039/C8NR00307F
Citation: Nanoscale, 2018,10, 6300-6305
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    Full-color capable light-emitting diodes based on solution-processed quantum dot layer stacking

    K. Lee, C. Han, E. Jang, J. Jo, S. Hong, J. Y. Hwang, E. Choi, J. Hwang and H. Yang, Nanoscale, 2018, 10, 6300
    DOI: 10.1039/C8NR00307F

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