Hahm Donghyo, Park Jisoo, Jeong Inho, Rhee Seunghyun, Lee Taesoo, Lee Changhee, Chung Seunjun, Bae Wan Ki, Lee Seonwoo
SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon-si, Gyeonggi-do 16419, Republic of Korea.
Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, South Korea.
ACS Appl Mater Interfaces. 2020 Mar 4;12(9):10563-10570. doi: 10.1021/acsami.9b23265. Epub 2020 Feb 24.
The rising demand for eradicating hazardous substances in the workplace has motivated vigorous researches on environmentally sustainable manufacturing processes of colloidal quantum dots (QDs) for their optoelectronic applications. Despite remarkable achievements witnessed in QD materials (e.g., Pb- or Cd-free QDs), the progress in the eco-friendly process is far falling behind and thus the practical use of QDs. Herein, a complete "green" process of QDs, which excludes environmentally unfriendly elements from QDs, ligands, or solvents, is presented. The implant of mono-2-(methacryloyloxy)ethyl succinate (MMES) ligands renders InP/ZnSeS QDs dispersed in eco-friendly polar solvents that are widely accepted in the industry while keeping the photophysical properties of QDs unchanged. The MMES-capped QDs show exceptional colloidal stabilities in a range of green polar solvents that permit uniform inkjet printing of QD dispersion. In addition, MMES-capped QDs are also compatible with commercially available photo-patternable resins, and the cross-linkable moiety within MMES further facilitates the achievement in the formation of well-defined, micrometer-scale patterning of QD optical films. The presented materials, all composed of simple, scalable, and environmentally safe compounds, promise low environmental impact during the processing of QDs and thus will catalyze the practicable use of QDs in a variety of optoelectronic devices.
工作场所对消除有害物质的需求不断增加，这推动了对用于光电应用的胶体量子点（QDs）的环境可持续制造工艺的积极研究。尽管量子点材料（如无铅或无镉量子点）取得了显著成就，但环保工艺的进展远远落后于量子点的实际应用。在此，本文提出了一种完整的量子点“绿色”工艺，该工艺从量子点、配体或溶剂中排除了对环境不友好的元素。单-2-（甲基丙烯酰氧基）乙基琥珀酸酯（MMES）配体的引入使InP/ZnSeS量子点分散在工业上广泛接受的环保极性溶剂中，同时保持量子点的光物理性质不变。MMES封端的量子点在一系列绿色极性溶剂中表现出优异的胶体稳定性，这使得量子点分散体能够进行均匀的喷墨打印。此外，MMES封端的量子点还与市售的可光图案化树脂兼容，MMES中的可交联部分进一步促进了形成定义明确的微米级量子点光学薄膜图案。所展示的材料均由简单、可扩展且对环境安全的化合物组成，有望在量子点加工过程中降低对环境的影响，从而促进量子点在各种光电器件中的实际应用。
