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Hahm, Donghyo; Lim, Jaemin; Kim, Hyeokjun; Shin, Jin-Wook; Hwang, Seongkwon; Rhee, Seunghyun; Chang, Jun Hyuk; Yang, Jeehye; Lim, Chang Hyeok; Jo, Hyunwoo; Choi, Beomgyu; Cho, Nam Sung; Park, Young-Shin; Lee, Doh C; Hwang, Euyheon; Chung, Seungjun; Kang, Chan-Mo; Kang, Moon Sung; Bae, Wan Ki
Nature nanotechnology, 09/2022, Volume: 17, Issue: 9Journal Article
Colloidal quantum dots (QDs) stand at the forefront of a variety of photonic applications given their narrow spectral bandwidth and near-unity luminescence efficiency. However, integrating luminescent QD films into photonic devices without compromising their optical or transport characteristics remains challenging. Here we devise a dual-ligand passivation system comprising photocrosslinkable ligands and dispersing ligands to enable QDs to be universally compatible with solution-based patterning techniques. The successful control over the structure of both ligands allows the direct patterning of dual-ligand QDs on various substrates using commercialized photolithography (i-line) or inkjet printing systems at a resolution up to 15,000 pixels per inch without compromising the optical properties of the QDs or the optoelectronic performance of the device. We demonstrate the capabilities of our approach for QD-LED applications. Our approach offers a versatile way of creating various structures of luminescent QDs in a cost-effective and non-destructive manner, and could be implemented in nearly all commercial photonics applications where QDs are used.
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