Journal
ACS NANO
Volume 10, Issue 2, Pages 2485-2490Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b07328
Keywords
perovskites; halides; quantum dots; nanocrystals; single photon sources; optoelectronics
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Funding
- European Union
- FP7 framework programmes through the Marie-Sklodowska Curie ITN network PHONSI [H2020-MSCA-ITN-642656]
- ERC [306733]
- European Research Council (ERC) [306733] Funding Source: European Research Council (ERC)
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Metal-halide semiconductors with perovskite crystal structure are attractive due to their facile solution processability, and have recently been harnessed very successfully for high-efficiency photovoltaics and bright light sources. Here, we show that at low temperature single colloidal cesium lead halide (CsPbX3, where X = Cl/Br) nanocrystals exhibit stable, narrow-band emission with suppressed blinking and small spectral diffusion. Photon antibunching demonstrates unambiguously nonclassical single-photon emission with radiative decay on the order of 250 ps, representing a significant acceleration compared to other common quantum emitters. High-resolution spectroscopy provides insight into the complex nature of the emission process such as the fine structure and charged exciton dynamics.
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