Alternative Patterning Process for Realization of Large-Area, Full-Color, Active Quantum Dot Display

Title
Alternative Patterning Process for Realization of Large-Area, Full-Color, Active Quantum Dot Display
Authors
한일기최원국송진동박준서강준현이송이박기선정신영김홍희김지훈이규태닐리쉬한지영
Keywords
Colloidal Quantum Dots; Light-emitting device; Pattering; Photolithography
Issue Date
2016-11
Publisher
Nano letters
Citation
VOL 16, NO 11-6953
Abstract
Although various colloidal quantum dot (QD) coating and patterning techniques have been developed to meet the demands in optoelectronic applications over the past years, each of the previously demonstrated methods has one or more limitations and trade-offs in forming multicolor, high-resolution, or large-area patterns of QDs. In this study, we present an alternative QD patterning technique using conventional photolithography combined with charge-assisted layer-by-layer (LbL) assembly to solve the trade-offs of the traditional patterning processes. From our demonstrations, we show repeatable QD patterning process that allows multicolor QD patterns in both large-area and microscale. Also, we show that the QD patterns are robust against additional photolithography processes and that the thickness of the QD patterns can be controlled at each position. To validate that this process can be applied to actual device applications as an active material, we have fabricated inverted, differently colored, active QD light-emitting device (QD-LED) on a pixelated substrate, which achieved maximum electroluminescence intensity of 23  770 cd/m2, and discussed the results. From our findings, we believe that our process provides a solution to achieving both high-resolution and large-scale QD pattern applicable to not only display, but also to practical photonic device research and development.
URI
http://pubs.kist.re.kr/handle/201004/64798
ISSN
1530-6984
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KIST Publication > Article
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