期刊
NANO LETTERS
卷 22, 期 9, 页码 3751-3760出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c00756
关键词
single quantum dot spectroscopy; perovskite quantum dots; single-photon purity; photostable photoluminescence; quantum light
类别
资金
- Swiss National Science Foundation (SNSF) [200021_192308]
- European Union's Horizon 2020 program, through a FET Open research and innovation action [899141]
- Air Force Office of Scientific Research [FA8655-21-1-7013]
- Office of Naval Research [FA8655-21-1-7013]
- SNSF [200021_188404]
- Swiss National Science Foundation (SNF) [200021_188404] Funding Source: Swiss National Science Foundation (SNF)
Attaining pure single-photon emission is crucial for quantum technologies. Over the past 20 years, researchers have developed various solid-state quantum emitters, but most of them require complex techniques. However, using quantum emitters that can operate at room temperature can greatly reduce system complexity.
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 similar to 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 biexciton quantum yield. Leveraging the latter, we achieve 98% single-photon purity (g(2)(0) as low as 2%) from a cavity-free, nonresonantly excited single 6.6 nm CsPbI3 QDs, showcasing the great potential of CsPbX3 QDs as room-temperature highly pure single-photon sources for quantum technologies
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