期刊
ACS NANO
卷 16, 期 10, 页码 16598-16607出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c06032
关键词
quantum dots; patterning; selective wetting; droplet; light-emitting diodes
类别
资金
- Global Frontier Hybrid Interface Materials (GFHIM) [2013M3A6B1078874]
- Nano . Material Technology Development Program [N R F-2021M3H4A3A01062963]
- National Research Founda-tion of Korea (NRF) - Ministry of Science and ICT
This article introduces a noninvasive surface-wetting approach to pattern multicolor quantum-dot (QD) arrays on a photoprogrammed hole transport layer (HTL). By modifying the surface of HTLs and controlling solvent evaporation kinetics, the area-selective wetting of QD patterns is achieved, while preventing cross-contamination between different QD colloids. Prototype electroluminescent quantum dot light-emitting diode arrays with high current efficiency and brightness were successfully realized.
Although the commercialization of electroluminescent quantum-dot (QD) displays essentially demands multicolor patterning of QDs with sufficient scalability and uniformity, the implementation of QD patterning in a light emitting diode device is highly challenging, mainly due to the innate vulnerability of QDs and charge-transport layers. Here, we introduce a noninvasive surface-wetting approach for patterning full-color QD arrays on a photoprogrammed hole transport layer (HTL). To achieve noninvasiveness of QD patterning, surface-specific modification of HTLs was performed without degrading their performance. Moreover, engineering the solvent evaporation kinetics allows area-selective wetting of QD patterns with a uniform thickness profile. Finally, multicolor QD patterning was enabled by preventing cross-contamination between different QD colloids via partial fluoroencapsulation of earlier-patterned QDs. Throughout the overall QD patterning process, the optoelectronic properties of QDs and hole-transport layers are well preserved, and prototype electroluminescent quantum dot light-emitting diode arrays with high current efficiency and brightness were realized.
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