ACS Appl Mater Interfaces. 2020 Jan 22;12(3):3961-3968. doi: 10.1021/acsami.9b19586. Epub 2020 Jan 8.
Incorporation of quantum dots (QDs) into color filters (CFs) are desired for less energy loss and wider viewing angle compared to a conventional display. However, aggregation and vulnerability to heat, moisture, and chemicals in the photo-patternable matrix are critical issues of the QD-CFs with high QDs concentration. Herein, we fabricated red (10 wt %) and green (20 wt %) QD-CFs using photolithography of QD/siloxane ink containing secondary thiol monomer. Ligand-exchanged QDs were chemically incorporated in methacrylate oligosiloxane resin. QD/siloxane composite showed superior stability under harsh heat and moisture (85 °C/5% RH and 85 °C/85% RH) conditions and chemicals (EtOH, HCl, and NaOH) compared to conventional QD/PR (commercial negative photoresist). QD-CFs (10 μm thick) effectively converted blue light emitted from LED chip into red and green light, and the obtained white PL through QD-CF showed wide color gamut, which was 108% relative to NTSC. From these advantages, QD/siloxane composite will be beneficial as color-conversion photoresists are to be used as color filters in liquid crystal displays, micro light-emitting diodes, and organic light-emitting diodes.
与传统显示器相比，将量子点 (QD) 纳入彩色滤光片 (CF) 可减少能量损失并拓宽视角。然而，高浓度 QD-CF 存在关键问题，包括 QD 在光可成型基质中易发生聚集和对热、湿气和化学物质敏感。在此，我们使用含有二次硫醇单体的 QD/硅氧烷油墨进行光刻，制备了红色 (10wt%) 和绿色 (20wt%) QD-CF。配体交换后的 QD 被化学结合到甲基丙烯酰氧基低聚硅氧烷树脂中。与传统的 QD/PR（商业负性光致抗蚀剂）相比，QD/硅氧烷复合材料在苛刻的热和湿度（85°C/5%RH 和 85°C/85%RH）以及化学物质（EtOH、HCl 和 NaOH）条件下具有更好的稳定性。10μm 厚的 QD-CF 可有效将 LED 芯片发出的蓝光转换为红光和绿光，通过 QD-CF 获得的白光 PL 具有较宽的色域，相对 NTSC 为 108%。鉴于这些优势，QD/硅氧烷复合材料将作为色彩转换光致抗蚀剂在液晶显示器、微发光二极管和有机发光二极管中用作彩色滤光片而具有优势。
