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Electrically-driven single-photon sources based on colloidal quantum dots with near-optimal antibunching at room
Xing Lin1, Xingliang Dai2, Chaodan Pu3
1Center for Chemistry of High-Performance & Novel Materials, State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Nature Communications
|October 27, 2017
Summary
We developed an electrically driven single-photon source using colloidal quantum dots. This scalable device achieves near-perfect single-photon purity at room temperature, crucial for quantum technologies.
Area of Science:
- Quantum Information Science
- Materials Science
- Optoelectronics
Background:
- Photonic quantum information systems require highly pure, scalable, and accessible single-photon sources.
- Colloidal quantum dots offer potential for developing such sources due to their tunable optical properties.
Purpose of the Study:
- To report an electrically driven single-photon source utilizing colloidal quantum dots.
- To demonstrate high-purity single-photon generation at room temperature with improved performance over photoluminescence.
Main Methods:
- Fabrication of solution-processed devices with isolated CdSe/CdS core/shell quantum dots embedded in an insulating layer between charge-transport layers.
- Characterization of single-photon emission properties, including second-order temporal correlation (g(2)(0)), under electrical driving at room temperature.
Main Results:
- Achieved near-optimal photon antibunching with g(2)(0) < 0.05 in the best devices, without spectral filtering or background correction.
- Demonstrated that electroluminescence g(2)(0) surpasses the limit of single-dot photoluminescence, indicating suppressed multi-photon emission.
- Device design effectively minimized background electroluminescence while enhancing single-dot emission.
Conclusions:
- The developed electrically driven colloidal quantum dot source offers a promising solution for high-purity single-photon generation.
- The novel device architecture and carrier dynamics contribute to the superior performance, breaking previous limitations.
- This work paves the way for scalable and practical photonic quantum information technologies.
