Facile synthesis of ultrastable organometal halide perovskite nanocomposites using superhydrophobic fumed silica as matrix

Organometal halide perovskite (OMHP) nanocrystals (NCs) have emerged as promising low-cost optoelectronic materials. However, the poor stability of OMHP NCs has greatly hindered their practical applications. Herein, we report a facile synthesis method of ultrastable OMHP nanocomposites by blending the precursor solution of OMHP and superhydrophobic fumed silica. The superhydrophobic surface of silica affords the perfect framework for the growing of nanocrystals. The OMHP composites with emission colour varying from blue to red were conveniently achieved via adjusting the halide element and content. The superhydrophobic fume silica not only improves the water resistance of the OMHP nanocomposites, but also increases their heat and light stability. The applications as phosphor for fabricating green and white light LEDs were demonstrated.