Halide-Modified Copper Quantum Dots for Tunable Narrow Emission
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Solution Overview
Problem
Current quantum dots with narrow emission full width at half maximum (FWHM) and controlled emission wavelength are limited in their ability to adjust emission wavelengths across a wide range while maintaining high luminescence efficiency, particularly in blue light absorption, leading to inefficient device performance.
Innovation Solution
The development of quantum dots comprising copper, a Group III element, and a Group VI element, with a halogen component, where the molar ratios of the halogen component to copper and the Group III element are optimized to achieve a photoluminescence spectrum with a maximum emission wavelength between 500 nm to 750 nm and a FWHM of 80 nm or less, allowing for adjustable emission wavelengths by varying the type of halides used in metal halide precursors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If quantum dots use conventional materials and structures, then they can achieve narrow FWHM and controlled emission wavelength, but they are limited in their ability to adjust emission wavelengths across a wide range while maintaining high luminescence efficiency
Solution Approach 1:
The patent applies parameter changes by systematically varying the molar ratios of halogen components (0.01 to 0.5) relative to copper and group III elements,以及 changing the types of halides used in metal halide precursors. These parameter modifications enable emission wavelength tuning from 500 nm to 750 nm while maintaining narrow FWHM (≤80 nm) and high luminescence efficiency through optimized composition ratios
Solution Approach 2:
The patent employs composite materials by combining copper, group III elements (Al, Ga, In, Tl, Nh), group VI elements (S, Se, Te), and halogen components in specific molar ratios. This composite approach creates quantum dots with tailored optical properties that achieve both wide emission wavelength range and maintained luminescence efficiency through synergistic material interactions
2Adaptability or versatility
If quantum dots are designed with fixed composition, then they exhibit stable emission properties, but they cannot achieve tunable emission colors across wide wavelength ranges
Solution Approach 1:
The patent utilizes parameter changes by adjusting molar ratios of halogen components (0.01 to 0.5) and varying halide types in precursors to achieve emission wavelength tuning from 500 nm to 750 nm. This systematic parameter modification enables emission color tunability while maintaining stable emission properties through controlled composition variations
Solution Approach 2:
The patent applies dynamics by making the quantum dot composition adjustable rather than fixed. The molar ratios of halogen components and the types of halides can be dynamically modified during synthesis to achieve different emission wavelengths, enabling tunable emission colors from green to red while maintaining narrow FWHM and high efficiency
3Reliability
If quantum dots use traditional metal precursors, then the manufacturing process is simple, but the blue light absorption and luminescence efficiency are insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the molar ratios of halogen components (0.01 to 0.5) and selecting specific halide types in metal halide precursors. These parameter optimizations enhance blue light absorption and luminescence efficiency while maintaining a relatively simple one-pot synthesis process, achieving improved performance without excessive manufacturing complexity
Solution Approach 2:
The patent employs composite materials by using metal halide precursors containing copper, group III elements, and halogen components in specific ratios. This composite approach improves blue light absorption and luminescence efficiency through enhanced material composition, while the precursors can be mixed in a single reaction step, maintaining ease of manufacture
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
This approach enables the quantum dots to exhibit a wider range of emission wavelengths while maintaining a narrow FWHM, enhancing blue light absorption and luminescence efficiency, and allowing for tunable emission colors from green to red, thereby improving the performance of quantum dot-based electronic devices.
Implementation Method 1
a photoluminescence spectrum of the quantum dot may have a maximum emission wavelength in a range of about 500 nm to about 750 nm and a full width at half maximum (FWHM) equal to or less than about 80 nm
Data Source
AI summary
A quantum dot includes copper (Cu), a Group III element, and a Group VI element, wherein the quantum dot further includes a halogen component that is an iodide ion, a bromide ion, a chloride ion, a fluoride ion, or a combination thereof. A molar ratio of the halogen component to the copper (Cu) and a molar ratio of the halogen component to the Group III element is each independently in a range of about 0.01 to about 0.5, and a full width at half maximum (FWHM) of a photoluminescence spectrum of the quantum dot is equal to or less than about 80 nm.