Synergistic surface passivation and matrix encapsulation of CsPbBr3 quantum dots for stable and high-efficiency wide gamut displays

All-inorganic cesium lead bromine perovskite quantum dots (CsPbBr 3 QDs) have emerged as promising semiconductor nanomaterials for display applications owing to their high photoluminescence quantum yields (PLQY) and narrow-band emission. However, their inherent instability under environmental stressors such as moisture, heat, and light severely limits their practical application. Herein, we proposed a dual-action synergistic approach that integrates chemical passivation with rigid encapsulation to overcome these limitations. Specifically, the sulfonic acid-based surfactant (SB3–18) coordinates with the unpassivated Pb 2 + sites on the CsPbBr 3 QDs surface to effectively to suppress surface trap states, while high-temperature sintering of mesoporous silica (MS) templates triggers pore collapse to form a dense protective matrix against environmental degradation. Structural and spectroscopic analyses corroborated the effectiveness of the approach. The optimized CsPbBr 3 -SB3–18/MS composites demonstrates enhanced stability, exhibiting excellent photostability and water-resistance, and good thermostability compared with the same stability test conditions as the material without the addition of SB3–18. The color gamut coverage of the as-prepared backlit white LED reaches 125.3 % of NTSC and 93.6 % of the Rec.2020. This work introduces a novel strategy integrating defect engineering and robust encapsulation within a high-temperature solid-phase synthesis approach to enhance the performance of perovskite nanomaterials.