BTP-4F modified CsPbBr3 quantum dots: enhancement of photoluminescence stability under UV, red light, and ambient conditions

CsPbBr 3 perovskite quantum dots (PQDs) possess exceptional optoelectronic properties, such as tunable bandgap and narrow emission linewidth, which underscore their significant potential for optoelectronic devices. However, their practical application is substantially hindered by surface defects, notably uncoordinated Pb 2+ ions, which result in low photoluminescence quantum yield (PLQY) and poor environmental stability. Non-fullerene small molecules have been proven to enhance the efficiency and stability of solar cells. In this work, the non-fullerene molecule BTP-4F was introduced into CsPbBr 3 PQDs, and the mechanism by which BTP-4F influences the stability of QDs under different irradiation conditions was thoroughly investigated. The findings reveal that BTP-4F effectively passivates surface defects by coordinating with undercoordinated Pb 2+ ions, thereby suppressing non-radiative recombination and improving the optical performance of the PQDs. Notably, the BTP-4F significantly inhibits photo-induced degradation and lattice distortion under both ultraviolet and red-light irradiation, presenting a synergistic optimization of PL and stability of the PQDs. The optimized QDs were successfully applied in high-color-rendering light-emitting diodes (LEDs), demonstrating their practical potential. These results provide experimental support for employing BTP-series molecules in PQD-based devices, particularly solar cells and light-emitting diodes. This advances the goal of unlocking the full potential of PQDs and integrating them into diverse optoelectronic applications.