biostudies-literatureZhu CSwiss National Science FoundationH2020 Future and Emerging TechnologiesAir Force Office of Scientific Research3751-3760https://www.ebi.ac.uk/biostudies/studies/S-EPMC9101069biostudies-literatureUnknown22(9)Attaining pure single-photon emission is key for many quantum technologies, from optical quantum computing to quantum key distribution and quantum imaging. The past 20 years have seen the development of several solid-state quantum emitters, but most of them require highly sophisticated techniques (e.g., ultrahigh vacuum growth methods and cryostats for low-temperature operation). The system complexity may be significantly reduced by employing quantum emitters capable of working at room temperature. Here, we present a systematic study across ∼170 photostable single CsPbX₃ (X: Br and I) colloidal quantum dots (QDs) of different sizes and compositions, unveiling that increasing quantum confinement is an effective strategy for maximizing single-photon purity due to the suppressed biNano lettersRoom-Temperature, Highly Pure Single-Photon Sources from All-Inorganic Lead Halide Perovskite Quantum Dots.PMC9101069200021200021_188404192308188404899141FA8655-21-1-7013200021_192308Bodnarchuk MIKovalenko MVRaino GFeld LBoehme SCBernasconi CDirin DCherniukh IMarczak MMoskalenko AZhu CfalseRoom-Temperature, Highly Pure Single-Photon Sources from All-Inorganic Lead Halide Perovskite Quantum Dots.Attaining pure single-photon emission is key for many quantum technologies, from optical quantum computing to quantum key distribution and quantum imaging. The past 20 years have seen the development of several solid-state quantum emitters, but most of them require highly sophisticated techniques (e.g., ultrahigh vacuum growth methods and cryostats for low-temperature operation). The system complexity may be significantly reduced by employing quantum emitters capable of working at room temperature. Here, we present a systematic study across ∼170 photostable single CsPbX₃ (X: Br and I) colloidal quantum dots (QDs) of different sizes and compositions, unveiling that increasing quantum confinement is an effective strategy for maximizing single-photon purity due to the suppressed bi2022-01-01T00:00:00Z2022 May2025-04-26T15:27:09.328Z2025-02-19T00:55:49.603ZS-EPMC91010693546789010.1021/acs.nanolett.2c00756