Porphyrin Functionalization of CsPbBrI2/SiO2 Core-Shell Nanocrystals Enhances the Stability and Efficiency in Electroluminescent Devices

Surface ligand exchange on all-inorganic perovskite nanocrystals of composition CsPbBrI2 reveals improved optoelectronic properties due to strong interactions of the nanocrystal with mono-functionalized porphyrin derivatives. The interaction is verified experimentally with an array of spectroscopic measurements as well as computationally by exploiting density functional theory calculations. The enhanced current efficiency is attributed to a lowering of the charging energy by a factor of 2-3, which is determined by combining electronic and optical measurements on a selection of ligands. The coupled organic-inorganic nanostructures are successfully deployed in a light-emitting device with higher current efficacy and improved charge carrier balance, magnifying the efficiency almost fivefold compared to the native ligand.

Automated summary

Surface ligand exchange on all-inorganic perovskite nanocrystals CsPbBrI2 leads to improved optoelectronic properties by strong interactions with mono-functionalized porphyrin derivatives, verified through experimental and computational methods. The enhanced current efficiency is attributed to a 2-3 times reduction in charging energy, determined by electronic and optical measurements on a selection of ligands. The organic-inorganic nanostructures are successfully applied in a light-emitting device with almost five times improved efficiency compared to the native ligand.