Full-color capable light-emitting diodes based on solution-processed quantum dot layer stacking
- Full-color capable light-emitting diodes based on solution-processed quantum dot layer stacking
- 황준연; 홍승기; Ki-Heon Lee; Chang-Yeol Han; Eun-Pyo Jang; Jung-Ho Jo; Eunsoo Choi; Jin-Ha Hwang; Heesun Yang
- QD; LED; Full color; Layer structure
- Issue Date
- VOL 10, NO 14-6305
- To date, most of the studies on quantum dot-light-emitting diodes (QLEDs) have been dedicated to the fabrication of highefficiency 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)/greenG)/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/RQD 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 buffermediated QD layer stacking may afford a viable means towards bright, efficient full-color-capable white devices.
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