Surface Decorating of CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> Nanoparticles with the Chemically Adsorbed Perylenetetracarboxylic Diimide

An organic dye-modified organolead halide CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> nanoparticle (cubic) is prepared successfully by using a perylenetetracarboxylic diimide (PDI) bearing an -NH<sub>3</sub><sup>+</sup> headgroup as the capping ligand. The nanopartilces are homogeneous with high crystallinity. The photoluminescence of perovskite is quenched completely by the chemically adsorbed PDI molecules. This efficient fluorescence quenching has confirmed that the PDI molecules are anchored on the surface of CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> nanoparticle. The resulting nanoparticles can be dispersed in organic solvents, and the resulting dispersion remains stable for days. This result provides a general guideline for surface engineering of organolead halide CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> nanoparticles.