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Electrically-driven single-photon sources based on colloidal quantum dots with near-optimal antibunching at room temperature
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Electrically-driven single-photon sources based on colloidal quantum dots with near-optimal antibunching at room temperature
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Journal Article
Electrically-driven single-photon sources based on colloidal quantum dots with near-optimal antibunching at room temperature
2017
Overview
Photonic quantum information requires high-purity, easily accessible, and scalable single-photon sources. Here, we report an electrically driven single-photon source based on colloidal quantum dots. Our solution-processed devices consist of isolated CdSe/CdS core/shell quantum dots sparsely buried in an insulating layer that is sandwiched between electron-transport and hole-transport layers. The devices generate single photons with near-optimal antibunching at room temperature, i.e., with a second-order temporal correlation function at zero delay (
g
(2)
(0)) being <0.05 for the best devices without any spectral filtering or background correction. The optimal
g
(2)
(0) from single-dot electroluminescence breaks the lower
g
(2)
(0) limit of the corresponding single-dot photoluminescence. Such highly suppressed multi-photon-emission probability is attributed to both novel device design and carrier injection/recombination dynamics. The device structure prevents background electroluminescence while offering efficient single-dot electroluminescence. A quantitative model is developed to illustrate the carrier injection/recombination dynamics of single-dot electroluminescence.
Single-photon sources are one of the most basic devices for quantum optical experiments and applications. Here, Lin et al. present an electrically driven single-photon source based on solution-processed colloidal quantum dots with near-optimal antibunching at room temperature.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
