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Multicolor Patterning of Perovskite Nanocrystals for High Resolution Display
고재완,마경연,방준하 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Patterns with high reliability, uniformity, and fine resolution has continuously been demanded for various optoelectronic devices. However, structural lability of perovskite nanocrystals always hinders them from being integrated into real device operation. Herein, we report patternable perovskite nanocrystals with high stability by introducing functional polymer ligand. By appplying low dosage of 365 nm UV, full-colored pattern arrays were fabricated with extremely high resolution (~465 PPI). This work present a promising strategy for designing sophisticated optoelectronic devices based on perovskite nanocrystals.
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Full-Colored Micron-Scale Photopatterning of Perovskite Nanocrystals
고재완,마경연,방준하 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Perovskite nanocrystals (PNCs) are a class of nanomaterials with superb color purity and high luminous efficiency. Despite many promising properties, There are still many remaining issues to integrate PNCs in real devices, such as i) enhancing poor stabilities and ii) devising efficient micro-patterning technology for high-resolution display. Herein, we report functional polymer encapsulated PNCs which enable us to demonstrate stable, full-colored, and high-definition patterns. Specifically, polymer ligands contain photo-cross likable cinnamoyl group on the backbone, and terminal ammonium halide group which can effectively passivate defect sites on the PNC. As a result, PNCs exhibited not only better optical properties but also improved stability. Furthermore, RGB microarrays with high pixels per inch (PPI) value of ~ 465 are successfully fabricated. We believe our patterning technique significantly contribute to the commercialization of PNCs in the field of next-generation display.
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고재완,사공준 한국환경보건학회 2018 한국환경보건학회지 Vol.44 No.1
Objectives: Based on the amount of amalgam, the duration of exposure, and the water pH, this study aims to investigate the change patterns in the mercury concentrations in water after amalgams have been introduced into sewage water. It is expected that the study results will be useful in improving the system for regulating the amount of mercury that is introduced into the environment. Methods: During the study, a glass test-tube with a cap was washed and disinfected using the glass laboratory device washing method. Then, 1, 2, 3, and 4 tabs were placedinto a 10 mL pH 4 solution and 10 mL pH 7 distilled water. Each specimen was prepared in duplicate. The mean of the two mercury concentrations was used as the representative value, and the mercury concentration was measured using a mercury measurement device (DMA-80, Milestone, Italy) a total of eight times at one-week intervals. Results: The results show that the lower wasthe pH, the higher wasthe amount of amalgam. Alsothe longer wasthe duration, the more significant was the increase of mercury concentration in the water. Conclusions: Dental clinics are collected separately from dental clinics that used them. Given this, dental clinics in Korea must have the necessary facilities to separately collect mercury at their level. In addition, proper disposal systems and social attention to the proper management of dental wastes are required to prevent environmental pollution frommercury.
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