Multidentate Ligand Strategy Enables Scalable-Synthesis and Aqueous-Stable CsPbBr3@CsPb2Br5 Perovskite Quantum Dots

Perovskite quantum dots (PeQDs) show promising potential in the optoelectronic field, but their commercial application is limited by the challenges of aqueous stability and large-scale production. Herein, we tackled both the issues via "one stone," namely multidentate coordination strategy. This approach leverages 3-bromo-2-methylpropionic acid (BMPA), where the carboxyl and bromomethyl groups provide robust four-site anchoring to the surface Cs+ atoms. Experiments and theoretical calculations reveal such multidentate coordination could effectively passivate halide vacancies and suppresses defect formation. Each batch enables the production over 1.2 g BMPA PeQDs at production yield of >85% and low cost of ∼56 CNY/g, with no obvious emission shift and a near-unity photoluminescence quantum yield (PLQYs), demonstrating exceptional batch-to-batch consistency. Furthermore, the robust interface affords superior environmental resilience, with the PeQDs dispersion retaining approximately 50% of its photoluminescence (PL) after 960 h of storage at 25 °C. Finally, the white light-emitting diodes (LEDs), fabricated using these PeQDs, exhibit standard white emission with color coordinates of (0.33, 0.33), high color rendering index of 92.6, and significantly improved stability. This work underscores the potential of the multidentate strategy as a robust and efficient pathway for the commercial-scale manufacturing of aqueous PeQDs.