Energy Transfer between Anthracene-9-carboxylic Acid Ligands and CsPbBr3 and CsPbI3 Nanocrystals

Cesium lead halide perovskite nanocrystals show great promise for optoelectronic applications due to their thermal stability, wide absorption range, and intense photoluminescence. These properties make CsPbX 3 (X = Cl, Br, or I) nanocrystals great potential candidates for incorporation into light harvesting antenna complexes and photon multipliers via the coordination of organic chromophores as surface-bound ligands. In this paper, we demonstrate the synthesis of CsPbBr 3 and CsPbI 3 NCs and direct in situ attachment of anthracene-9-carboxylic acid ligands to their surface. Using steady-state and time-resolved fluorescence measurements, we show that CsPbX 3 –anthracene systems demonstrate energy transfer from the anthracene ligands via FRET with efficiencies as high as 40%.