| 초록 |
Quantum dot (QD) with wide absorption and narrow emission band is attracting attention as a display material such as a color conversion layer (CCL). When QDs are applied a display material, QDs are susceptible to external conditions such as heat, water, and oxygen. The polymer nanocomposite must be manufactured to ensure stability of QDs. However, conventional polymers cannot effectively protect QDs due to low heat resistance. PI has high heat resistance with excellent flexibility. We fabricated QD-polymer nanocomposites using crosslinking of short-chain polyimides (PI) ligands of quantum dots and long-chain polyimides. Crosslinking prevents aggregation and reduces energy transfer between QDs. The degree of crosslinking was controlled by changing the concentration of QDs used as crosslinkers and the length of long-chain polyimides. Crosslinked QD-PI nanocomposites were analyzed through DSC, and better luminous efficiency was observed in nanocomposites with a high degree of crosslinking. We expect that this QD-PI nanocomposite will secure high stability and quantum efficiency of QDs with high concentration and will be used in various applications such as flexible displays and CCL. |
