CsPbX3 quantum Dots@ZIF-8 composites with enhanced luminescence emission and stability

Colloidal perovskite quantum dots (CsPbX3) are highly desirable in optoelectronics due to their favorable optical properties. However, their instability limits their practical application. This study investigates the use of metal-organic frameworks as carrier matrices for perovskite quantum dots, which could enhance their stability without compromising their optical properties. Here, CsPbBr3@ZIF-8 composite materials were synthesized through an in-situ growth method. The results demonstrate that the CsPbBr3 quantum dots in the composite exhibit a significantly longer lifetime (increasing from 11 ns to 39 ns), higher quantum yield (increasing from 32 % to 53 %) compared to pure perovskite quantum dots. The photothermal stability of the composite is also superior to that of the pure quantum dots, as the composite maintains 81 % of its quantum yield under light, 82 % under wet air, and 72.5 % under continuous heating at 120 °C. Furthermore, the CsPbBr3@ZIF-8 based flexible fluorescent film shows adjustable viscosity, which provides a novel approach for next-generation flexible displays.