Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Republic of Korea.
Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
Nano Lett. 2021 Mar 10;21(5):2288-2295. doi: 10.1021/acs.nanolett.1c00134. Epub 2021 Mar 1.
Micropatterns with a high stability, definition, and resolution are an absolute requirement in advanced display technology. Herein, patternable perovskite nanocrystals (PNCs) with excellent stability were prepared by exchanging pristine ligands with multifunctional polymer ligands, poly(2-cinnamoyloxyethyl methacrylate). The polymer backbone contains a cinnamoyl group that has been widely employed as a photo-cross-linker under 365 nm UV irradiation. Also, the terminal group is readily adjustable among NHCl, NHBr, and NHI, allowing us to obtain multicolored PNCs via instant anion exchange. Furthermore, the resulting ligand exchanged PNCs exhibited enhanced stability toward polar solvents without any undesirable influence on the structural or optical properties of the PNCs. Using anion exchanged PNCs, RGB microarrays with a subpixel size of 10 μm × 40 μm were successfully demonstrated. Our results highlight the versatility and feasibility of a simplified patterning strategy for nanomaterials, which can be generally applied in the fabrication of various optoelectronic devices.
具有高稳定性、清晰度和分辨率的微图案是先进显示技术的绝对要求。在此，通过用多功能聚合物配体聚（2-肉桂酰氧基乙基甲基丙烯酸酯）取代原始配体，制备了稳定性优异的可图案化钙钛矿纳米晶体（PNC）。聚合物主链含有肉桂酰基，该基团已广泛用作 365nmUV 照射下的光交联剂。此外，末端基团在 NHCl、NHBr 和 NHI 之间易于调节，使我们能够通过即时阴离子交换获得多色 PNC。此外，所得配体交换 PNC 对极性溶剂表现出增强的稳定性，而对 PNC 的结构或光学性质没有任何不利影响。使用阴离子交换 PNC，成功展示了亚像素尺寸为 10μm×40μm 的 RGB 微阵列。我们的结果突出了简化纳米材料图案化策略的多功能性和可行性，该策略可广泛应用于各种光电设备的制造。
