Long Chain Ligands of Quantum Dots to Enhance Patterning Yield of 100%

Abstract

To applicate in display devices, high-resolution is inevitably required. We used colloidal quantum dots (QDs) because of its superior photoelectric properties such as tunable bandgap, high color purities, and high photoluminescence quantum yields (PLQY). For patterning QDs, dry transfer printing is promising because it maintain intrinsic properties of QDs. Depending on the type of ligands used, the patterning yield is affected and the use of a ligands having a high patterning yield is required. Here, we compared QDs with organic (C8-C18) and inorganic (I ) ligands. Long organic chain ligands showed ~100% patterning yields. Because of weak interparticle attraction between QDs and ligands, short organic chain ligands showed internal crack. Inorganic ligands also not effective to patterning because of poor adhesion.