Functional Ligand-Modified Perovskite Quantum Dots for Stable Full-Color Microarrays via Photopolymerization

Integration of lead-halide perovskite quantum dots (PQDs) into full-color microarrays presents numerous advantages for full-color micro-LED displays. There is an urgent requirement for a new design approach that simplifies the creation of durable PQD/polymer composites to produce stable PQD microarrays. Here, mono-2-(methacryloyloxy)ethyl succinate (MMeS) is utilized as a functional ligand to synthesize green MMeS-modified CsPbBr₃ PQDs (M-CPB PQDs). The subsequent photopolymerization of M-CPB PQDs with 1,6-hexanediol diacrylate (HDDA) forms a CsPbBr₃ PQD/polymer composite. This composite exhibits a solid-state photoluminescence quantum yield of 73.1%, and the photoluminescence intensity retains 72% of its original value after 17 days of continuous immersion in water. Stable green PQD/polymer microarrays can be printed using an ink containing M-CPB PQDs, HDDA, diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, and n-dodecane via electrohydrodynamic jet printing and in situ polymerization under UV light irradiation. Full-color patterns can also be generated with MMeS-modified red, green, and blue PQDs. These findings highlight the critical role of functionalizing the surface ligands of PQDs to improve their processability, thereby facilitating the development of stable PQD/polymer microarrays.