Publication date: 8th June 2021
The rapid development of photonic and laser technologies revealed the need to develop new materials for a highly efficient light generation and creating devices based on them. The low-dimensional nanocrystals (NCs) - based on inorganic halide perovskites (CsPbX3, X = Cl, Br, I) have manifested themselves as promising materials in this regard due to the high quantum yield of photoluminescence (up to 90% in solution [1]), pronounced excitonic response at room temperature due to the high exciton binding energy [2] and narrow emission bands in combination with simple synthesis technology. Moreover, CsPbBr3 NCs are able to demonstrate nonlinear light conversion [3]. However, perovskite nanostructures are susceptible to air moisture and oxygen [4], deteriorating their optical performance. Thereby, perovskites’ stability is an urgent scientific challenge. A simple and elegant solution is to use a relatively large surface-to-volume ratio of NCs that allows their encapsulation in an inert shell (polymer, SiO2, etc.) [5] or ligands [6].
Here we report on linear and nonlinear optical properties of CsPbBr3 NCs encapsulated in fluoropolymer mats by means of the electrospun method. We suppose that the recrystallization of NCs happens during the formation of fluoropolymer material giving the distribution of NCs size in the range of 5–14 nm with an average diameter of about 9.8 nm with a standard deviation of 1.8 nm which is slightly smaller than the average size of NCs in the colloid used for the synthesis. Obtained mats with NCs demonstrate a pronounced narrow PL line under below- and above-band-gap excitation. We also show the enhancement of perovskite water stability allowing perovskite to withstand the 9-hour immersion test with only 40% PL intensity decay.
This work was supported by the Scholarship of the President of the Russian Federation for young scientists and graduate students (project no. SP-5169.2021.5).
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