In situ growth of CsPbBr3@PS flexible fiber papers by one step electrospinning with high stability toward fluorescent sensor

Recently, all-inorganic CsPbX 3 (Br, I, CI) perovskites are hot and potential materials which apply to photoelectric device , due to their excellent photoelectric properties such as high carrier mobility , high fluorescence, etc. However, the poor stability greatly restricts their practical applications. In this paper, CsPbBr 3 nanocrystals (NCs) were in-situ encapsulated into PS polymer nanofibers by one step electrospinning with highly uniform size and spatial distribution. The hydrothermal stability of the obtained CsPbBr 3 @PS flexible fiber paper was radically improved with a photoluminescence quantum yield (PLQY) of 66.3%. The PL strength remained 97.2% of the initial value after immersion in water for 10 days. Their PLQY remains above 50% of its original value after heating at 80 °C for 5 h. Due to the excellent optical properties and stability of CsPbBr 3 @PS flexible fiber papers, the detection for rhodamine 6G (R6G) and rhodamine B (RhB) aqueous solution with high FRET value of 24.7% and 21.4%, respectively. Moreover, the minimum detection limit for R6G aqueous solution is 0.005 ppm. This study suggests that the CsPbBr 3 @PS flexible fiber paper is a good candidate for fabricating flexible optoelectronic devices, promising application potentials in lighting and display fields.