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- Title
Electrically-driven single-photon sources based on colloidal quantum dots with near-optimal antibunching at room temperature.
- Authors
Xing Lin; Xingliang Dai; Chaodan Pu; Yunzhou Deng; Yuan Niu; Limin Tong; Wei Fang; Yizheng Jin; Xiaogang Peng
- Abstract
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.
- Subjects
SEMICONDUCTOR nanocrystals; QUANTUM dots; ELECTROLUMINESCENCE
- Publication
Nature Communications, 2017, Vol 8, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-017-01379-6