Thermally and Chemically Robust Colloidal Quantum Dots by Cross-Linkable Polymeric Ligands
발표자
()
초록
내용
Endowing quantum dots (QDs) with robustness is of the utmost importance since the major limitation of QDs in practical applications are their thermal instabilities. Herein, we propose an effective passivation method using polymeric ligands, thiol-terminated poly(methyl methacrylate-b-glycidyl methacrylate) (P(MMA-b-GMA)). The cross-linking of PGMA providing a robust network on QDs are conducted by a mild reaction condition using Lewis acid under an ambient environment, thereby not affecting the photoluminescence quantum yield (PL QY) of QDs. The resulting cross-linked shell suppresses the formation of charge trap sites under high temperature, which are mainly responsible for diminished PL QY. Our method is simple with wide applicability to the range of various sizes and compositions of QDs, thus, paving the way for the practical hybridization with polymeric materials typically employed in the fields of display fabrication especially as a down-conversion layer or color filter.