Heterogeneous Quantum Dot Ligands for Efficient, Long-Life Light Emission

The patent uses a composite ligand system comprising two different ligands with distinct functions: a first ligand with crosslinkable functional groups for network formation, and a second ligand for stabilizing quantum dot surfaces. This composite approach enables simultaneous achievement of high luminous efficiency through crosslinked network structure and quantum dot stability, resolving the contradiction between performance improvement and device complexity

The ligand system is segmented into two distinct components with specialized functions. The first ligand (with crosslinkable groups) handles network formation and structural stability, while the second ligand handles surface stabilization of quantum dots. This functional segmentation allows each ligand to optimize its specific role, improving overall luminous efficiency without requiring a single complex multifunctional molecule

The patent incorporates crosslinkable functional groups in the first ligand that enable pre-forming of crosslinked networks during the manufacturing process. This preliminary crosslinking action creates a stable structural framework before device operation, extending quantum dot lifespan while allowing the crosslinking to occur during standard manufacturing procedures rather than requiring additional post-processing steps

The patent utilizes thermally crosslinkable functional groups that undergo chemical transformation when exposed to heat during the manufacturing process. This parameter change (temperature-induced crosslinking) converts the ligand system from a simple mixture to a crosslinked network structure, improving quantum dot stability and lifespan while utilizing existing manufacturing thermal processes