Publication date: 15th December 2025
High-resolution quantum-dot electroluminescent (QD-EL) devices are emerging as key components in next-generation optoelectronic systems, including emissive microdisplays and compact solid-state light sources [1]. This work introduces a solution-processable fabrication strategy that integrates printed electron-transport layers QD/organic nanohybrid emissive layers by inkjet or electrohydrodynamic (EHD) jet printing, enabling precise patterning and device fabrication under ambient air conditions.
The nanohybrid emissive layers—formed through controlled interactions between quantum dots and functionalized polymeric components—enhance charge balance, reduce trap-mediated recombination, and improve film uniformity and environmental robustness. Their solvent-orthogonal characteristics allow seamless integration into multilayer printed device stacks [2].
Particularly, EHD-jet printing enables ultra-fine patterning by generating droplets significantly smaller than the nozzle diameter. By optimizing jetting modes, nanohybrid features with pitches down to ~5 µm (≈5,080 pixels per inch, PPI) were produced, and fully functional EL pixels with lateral dimensions of ~21 µm (≈300 PPI) were fabricated entirely under ambient conditions. These results demonstrate that printing-based processes can reliably achieve high-resolution, display-grade QD-EL structures.
Importantly, the demonstrated printing strategy is not limited to a specific QD composition. While compatible with non III–V blue quantum dots, it can be extended across diverse QD families, enabling scalable pathways toward full-color RGB QD-EL devices and advanced optoelectronic applications.
This work was supported by the Technology Innovation Program (00420454) funded by the Ministry of Trade, Industry and Energy (MOTIE, Korea); by the German-Korean Joint SME R&D Projects Program funded by the German Federal Ministry for Economic Affairs and Climate Action (BMWK) and MOTIE (KIAT: P0026151; AiF Projekt GmbH—ZIM: KK5558901FG3 and KK5392606FG3); and by the European Union’s Horizon 2020 research and innovation program under grant agreement No. 862410. The authors thank Stefanie Voigt and Stefan Kroepke for their technical support with device fabrication and the EHD-jet printing process.
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