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Towards non-blinking and photostable perovskite quantum dots

Chenjia MiDepartment of Chemistry and Biochemistry, The University of Oklahoma, Norman, OK, 73019, USAGavin C. GeeDepartment of Chemistry and Biochemistry, The University of Oklahoma, Norman, OK, 73019, USAChance LanderDepartment of Chemistry and Biochemistry, The University of Oklahoma, Norman, OK, 73019, USADonghoon ShinDepartment of Chemistry, Northwestern University, Evanston, IL, 60208, USAMatthew L. AtteberryDepartment of Chemistry and Biochemistry, The University of Oklahoma, Norman, OK, 73019, USANovruz G. AkhmedovDepartment of Chemistry and Biochemistry, The University of Oklahoma, Norman, OK, 73019, USALamia HidayatovaDepartment of Chemistry and Biochemistry, The University of Oklahoma, Norman, OK, 73019, USAJesse DiCensoDepartment of Chemistry and Biochemistry, The University of Oklahoma, Norman, OK, 73019, USAWai Tak YipDepartment of Chemistry and Biochemistry, The University of Oklahoma, Norman, OK, 73019, USABin ChenDepartment of Chemistry, Northwestern University, Evanston, IL, 60208, USAYihan ShaoDepartment of Chemistry and Biochemistry, The University of Oklahoma, Norman, OK, 73019, USAYitong DongCenter for Quantum Research and Technology, The University of Oklahoma, Norman, OK, 73019, USA. [email protected]

2025en

ABI

Annotatsiya

Surface defect-induced photoluminescence blinking and photodarkening are ubiquitous in lead halide perovskite quantum dots. Despite efforts to stabilize the surface by chemically engineering ligand binding moieties, blinking accompanied by photodegradation still poses barriers to implementing perovskite quantum dots in quantum emitters. To date, ligand tail engineering in the solid state has rarely been explored for perovskite quantum dots. We posit that attractive intermolecular interactions between low-steric ligand tails, such as π-π stacking, can promote the formation of a nearly epitaxial ligand layer that significantly reduces the quantum dot surface energy. Here, we show that single CsPbBr3 quantum dots covered by stacked phenethylammonium ligands exhibit nearly non-blinking single photon emission with high purity (~ 98%) and extraordinary photostability (12 hours continuous operation and saturated excitations), allowing the determination of size-dependent exciton radiative rates and emission line widths of CsPbBr3 quantum dots at the single particle level. Mi et al. report epitaxial surface coverage of single CsPbBr3 quantum dots with size ranging from 3.6 nm to 14 nm using low steric ligand tails with attractive π-π stacking, leading to nearly non-blinking single photon emission with high purity of 98% and photostability over 12-hour irradiation.

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Identifikatorlar

DOI: 10.1038/s41467-024-55619-7

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