POS4-0743
MOF-Mediated Ligand Coverage Regulation for Defect-Suppression of CsPbX3 (X= Cl, Br, I) Perovskite Quantum Dots
Topic
S4. Colloids, Interfaces, and Molecular Assemblies for Functional Soft Materials
When and Where
Sep 29, 2026
08:30 - 09:30
Room 301 (Grand Ballroom)
Session Chairs
Hae Jung SON
Boseok KANG
Presenter(s)
Choi Jun Ho (Chung-Ang University)
Co-Author(s)
Abstract
Perovskite quantum dots (PQDs) have emerged as promising materials for optoelectronic applications due to their excellent optical properties. However, surface ligands of PQDs exhibit dynamic binding and desorption behavior, and excess ligands remaining in the solution after synthesis can influence the ligand environment, leading to suboptimal surface ligand coverage, increased defect states, and reduced stability. To date, MOF-assisted PQD studies have primarily focused on MOF-PQD composites, surface coating, and encapsulation strategies, whereas MOF-based regulation of excess ligands in PQDs has rarely been reported. In this study, we propose an MOF-mediated ligand coverage regulation strategy utilizing hierarchical ZIF-8 (hZIF-8) as a ligand regulator. The hZIF-8, prepared through CTAB-assisted surface reconstruction, exhibited an increased specific surface area and abundant adsorption sites, enabling effective regulation of excess ligands in the PQD solution. As a result, the PLQY of hZIF-8-mediated CsPbBr3 PQDs improved from 81.5% to 91.1%, accompanied by prolonged carrier lifetime due to the suppression of non-radiative recombination. In addition, trap density was reduced while moisture and thermal stability were significantly enhanced. The proposed strategy was further extended to red, green, blue CsPbX3 PQDs, demonstrating its broad applicability. This study presents a novel post-treatment strategy that utilizes MOFs as ligand regulation tools rather than as components of the final composite materials, providing a new pathway for controlling the surface ligand envrionment of colloidal PQDs.
