Abstract
We demonstrate a facile, low-cost and room-temperature method of anion exchange in cesium lead bromide nanocrystals (CsPbBr3 NCs), embedded into a polymer matrix. The anion exchange occurs upon exposure of the solid CsPbBr3 NCs/PDMS nanocomposite to a controlled anion precursor gas atmosphere. The rate and extent of the anion exchange reaction can be controlled via the variation of either the exposure time or the relative concentration of the anion precursor gas. Post-synthesis chemical transformation of perovskite nanocrystal-polymer composites is not readily achievable using conventional methods of anion exchange, which renders the gas-assisted strategy extremely useful. We envisage that this work will enable the development of solid-state perovskite NC optoelectronic devices.
Highlights
We demonstrate a facile, low-cost and room-temperature method of anion exchange in cesium lead bromide nanocrystals (CsPbBr3 NCs), embedded into a polymer matrix
The anion exchange occurs upon exposure of the solid CsPbBr3 NCs/PDMS nanocomposite to a controlled anion precursor gas atmosphere
We demonstrate anion exchange in nanocomposite layers, comprising of CsPbBr3 NCs dispersed in polydimethylsiloxane (PDMS), upon their exposure to a halide precursor gas atmosphere at room temperature
Summary
Low-cost and room-temperature method of anion exchange in cesium lead bromide nanocrystals (CsPbBr3 NCs), embedded into a polymer matrix. The stability of halide perovskite NCs still remains a research topic of great interest.[18] It has been reported that the robustness of CsPbX3 NCs can be improved by the addition of a small amount of polymer (poly(maleic anhydride-alt-1-octadecene)-PMA into the precursor solutions, which creates an additional ligand coating around each individual NC, or via encapsulation into PMMA or polyethylene oxide).[12,19,20,21] a silica-coating process In this communication, we introduce for the rst time a GIFT process in perovskite NCs in solid state. Apart from the tunability of nanoparticle emission, it is shown that the PDMS matrix protects the NCs against adverse humidity effects, giving rise to stable optical properties These properties can open up new avenues for the in situ and low-cost optical modulation of perovskite polymernanocomposites, useful in various optoelectronic applications. A slight broadening of the respective emission peak was observed due to the formation of NC clusters, which was by Two-Photon Excited Fluorescence (TPEF) Microscopy (Fig. S4†)
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