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

Recently, all-inorganic CsPbX3 (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, CsPbBr3 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 CsPbBr3@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 CsPbBr3@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 CsPbBr3@PS flexible fiber paper is a good candidate for fabricating flexible optoelectronic devices, promising application potentials in lighting and display fields.