Publication date: 15th December 2025
Colloidal halide perovskite quantum dots (QDs) have garnered significant attention as single-photon source materials due to their scalable synthesis, solution-processability, and high brightness. Despite extensive efforts to stabilize the surface through chemical engineering of ligand binding components, individual CsPbBr3 perovskite QDs often exhibit fluorescence intermittence (also known as “blinking”) and severe photodegradation. Here, we introduce a solid-state organic crystal passivation strategy for CsPbX3 (X=Br, I) perovskite QDs with sizes ranging from 3.6 to 14 nm. By leveraging the low steric hindrance of phenethylammonium ligands and their attractive intermolecular interactions, we promote the epitaxial ligand crystallization on the surface of single CsPbX3 (X=Br, I) QDs. These QDs exhibit nearly non-blinking single-photon emission with high purity (~98%) and remain photostable after 12 hours of continuous operation. Single QDs can also withstand saturated laser excitation.[1] These advantages enable the determination of size-dependent exciton radiative rates and emission linewidths of CsPbBr3 QDs at the single-particle level. Additionally, we discuss the impact of the ligand molecular crystal on the optical properties of single perovskite QDs at room and cryogenic temperatures.
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