Alternative Patterning Process for Realization of Large-Area, Full-Color, Active Quantum Dot Display
- Alternative Patterning Process for Realization of Large-Area, Full-Color, Active Quantum Dot Display
- 한일기; 최원국; 송진동; 박준서; 강준현; 이송이; 박기선; 정신영; 김홍희; 김지훈; 이규태; 닐리쉬; 한지영
- Colloidal Quantum Dots; Light-emitting device; Pattering; Photolithography
- Issue Date
- Nano letters
- VOL 16, NO 11-6953
- 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.
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