Quantum Dot Single Photon Source Device with Insulating Matrix
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Solution Overview
Problem
Current electroluminescent single photon sources have high autocorrelation coefficients, which are not sufficient for practical applications, leading to background noise and interference in single photon emission.
Innovation Solution
A single photon source device is designed with a quantum dot light-emitting layer comprising insulating material and quantum dots, where the neighbor distance of quantum dots is greater than or equal to the central wavelength of their luminescent spectrum, and an insulating material with a bandgap at least 2 eV greater than the quantum dots is used to balance electron and hole injection, reducing background noise and improving single photon emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum dots are used in electroluminescent single photon source, then single photon emission capability is improved, but autocorrelation coefficient becomes too high for practical applications
Solution Approach 1:
The patent applies local quality by creating distinct regions with different quantum dot densities. The first light-emitting layer has a lower quantum dot density (first concentration) while the second light-emitting layer has a higher quantum dot density (second concentration). This spatial variation in material properties allows different regions to serve different functions: the first layer provides cleaner single photon emission with lower autocorrelation, while the second layer enhances overall emission intensity
Solution Approach 2:
The patent segments the quantum dot light-emitting layer into two distinct layers with different quantum dot concentrations. This segmentation allows independent optimization of each layer's properties - the first layer with lower concentration minimizes background noise and autocorrelation effects, while the second layer with higher concentration provides sufficient photon emission intensity for practical applications
2Illumination intensity
If quantum dot density is increased to enhance emission intensity, then light output is improved, but background noise and interference increase
Solution Approach 1:
The patent implements local quality by assigning different quantum dot concentrations to different layers. The first light-emitting layer uses lower quantum dot density to minimize background noise and interference, while the second light-emitting layer uses higher quantum dot density to provide sufficient emission intensity. This spatial differentiation of material properties resolves the contradiction between intensity and noise
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly reduces the autocorrelation coefficient to less than 0.1, enhancing the single photon emission effect and increasing the number of single photons collected per second, while allowing operation at a lower threshold voltage, making it suitable for various applications including quantum communication and computing.
Implementation Method 1
the insulating material is disposed in the quantum dot light-emitting layer... the insulating material with a bandgap at least 2 eV greater than the quantum dots is used to balance electron and hole injection, reducing background noise
Implementation Method 2
A single photon source device is designed with a quantum dot light-emitting layer comprising insulating material and quantum dots... enhancing the single photon emission effect
Data Source
AI summary
The present application provides a single photon source device, a preparation method thereof, and applications of the same. The single photon source device includes a first electrode layer, a first carrier transport layer, a quantum dot light-emitting layer, a second carrier transport layer and a second electrode layer which are stacked in sequence, and the quantum dot light-emitting layer comprises an insulating material and quantum dots dispersed in the insulating material, neighbor distance of at least a part of the quantum dots is greater than or equal to the central wavelength of the luminescent spectrum of quantum dots.