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Abstract
In this work, thin composite films of zeolitic imidazolate frameworks (ZIFs) and colloidal two-dimensional (2D) CdSe/CdS nanoplatelet emitters with minimal scattering are formed by cycled growth and yield highly transparent coatings while retaining the strong and narrow photoluminescence of the nanoplatelets at 546 nm (FWHM: 25 nm) in a solid-state composite structure. The porous ZIF matrix acts as functional encapsulation for the nanoplatelet emitters which is shown by the adsorption of the guest molecules water and ethanol by the ZIF and sensed by a reversable change in the photoluminescence of the embedded nanoplatelets. Additionally, the transmittance of the composite films surpasses the values of uncoated glass substrates at UV-Vis wavelengths where the nanoplatelets show no absorption, rendering it a photoluminescent antireflective coating. The fast formation of smooth films without pre-polymerizing the colloidal nanoplatelet emitters provides a powerful tool for application-oriented photoluminescence-based gas sensing in the composites.
