Multi-Component Quantum Dot Core-Shell Structure Narrowing FWHM
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Solution Overview
Problem
Quantum dots with multi-component compounds in existing technologies have a wide full width at half maximum (FWHM) due to surface defects and size inhomogeneity, leading to reduced color reproducibility and luminescence efficiency.
Innovation Solution
A quantum dot with a core structure represented by Formula M1aM2bM3cM4dM5e, where M1 is a Group I metal, M2 and M3 are Group III metals, and M4 and M5 are Group VI elements, with specific molar ratios and a shell structure to achieve a narrow FWHM and improved color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If quantum dots with multi-component compounds are used, then color conversion function is achieved, but full width at half maximum (FWHM) becomes wide due to surface defects and size inhomogeneity
Solution Approach 1:
The patent applies a core-shell structure where a core quantum dot (containing multi-component compound for color conversion) is nested within a shell layer. This nesting approach allows the core to provide color conversion functionality while the shell protects against surface defects and reduces size inhomogeneity effects, thereby achieving narrow FWHM despite using multi-component compounds.
Solution Approach 2:
The patent uses composite material structure combining different semiconductor materials in the core (e.g., Cu, Ag, In, Ga, Al with S, Se, Te) and protective/shell materials. This composite approach enables the quantum dot to maintain crystal structure uniformity while achieving desired color conversion properties and narrow emission spectrum.
2Manufacturing precision
If quantum dot size is controlled for specific wavelength emission, then color purity is improved, but luminescence efficiency is reduced due to surface defects
Solution Approach 1:
The patent converts the harmful effect of surface defects (which cause non-radiative recombination and reduce luminescence efficiency) into a beneficial structure by introducing a shell layer. The shell passivates surface defects, transforming the problem of surface states into an opportunity to enhance luminescence efficiency while maintaining the size-controlled color purity of the core.
3Manufacturing precision
If quantum dot size is reduced for narrow FWHM, then color reproducibility is improved, but crystal structure uniformity becomes difficult to maintain
Solution Approach 1:
The patent applies different structural qualities to different parts of the quantum dot: the core maintains size control for narrow FWHM and color reproducibility, while the shell provides a stable crystal structure environment. This local differentiation allows the small core to achieve narrow emission while the shell ensures structural uniformity and stability.
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 quantum dot achieves a narrow FWHM, enhancing color reproducibility and luminescence efficiency, allowing for the emission of specific wavelengths such as red or near-infrared light, and improving the viewing angle of light-emitting devices.
Implementation Method 1
Quantum dots are nanocrystals of semiconductor materials and exhibit a quantum confinement effect. When quantum dots are excited to an energy excited state (e.g., an excited state) from a ground state after (by) receiving light from an excitation source, they emit energy according to a corresponding energy band gap of themselves.
Implementation Method 2
When quantum dots are excited to an energy excited state (e.g., an excited state) from a ground state after (by) receiving light from an excitation source, they emit energy according to a corresponding energy band gap of themselves.
Data Source
AI summary
A quantum dot including a core represented by Formula 1, a method of manufacturing the quantum dot, and a light-emitting device and an apparatus including the quantum dot are provided:M1aM2bM3cM4dM5e, Formula 1wherein M1 is a Group I metal element, M2 and M3 are each independently a Group III metal element, and M4 and M5 are each independently a Group VI element; and a is 0.05 to 0.60, b is 0 to 1.4, c is 0 to 1.4, d is 0 to 2.0, and e is 0 to 2.0.