Green-Emitting Semiconductor Nanoparticle Composition Without Cadmium
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Solution Overview
Problem
There is a need for semiconductor nanoparticles that emit light without using harmful heavy metals like cadmium, while maintaining improved luminescent properties and stability.
Innovation Solution
A semiconductor nanoparticle composed of a first semiconductor nanocrystal with silver, indium, gallium, and sulfur, and a second semiconductor nanocrystal with zinc, gallium, and sulfur, configured to emit green light, with specific molar ratios of zinc to indium and gallium to indium to achieve enhanced optical properties and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If cadmium-based semiconductor nanoparticles are used, then luminescent properties are improved, but environmental harm and toxicity increase
Solution Approach 1:
The patent changes the chemical composition parameters by replacing cadmium with non-toxic elements (silver, indium, gallium, zinc, sulfur) while adjusting their molar ratios to achieve desired optical properties. The specific molar ratio ranges (Zn:In 0.1:1 to 10:1, Ga:In 2.5:1 to 10:1) are optimized to maintain luminescent performance without cadmium
Solution Approach 2:
The patent creates a composite semiconductor nanoparticle structure containing multiple elements (silver, indium, gallium, zinc, sulfur) in specific combinations. This composite approach allows achieving the optical properties of cadmium-based materials while using environmentally friendly components
2Ease of manufacture
If semiconductor nanoparticle composition is simplified, then manufacturing ease is improved, but optical properties deteriorate
Solution Approach 1:
The patent optimizes composition parameters by defining specific molar ratio ranges that balance manufacturing simplicity with optical performance. The ranges (Zn:In 0.1:1 to 10:1, Ga:In 2.5:1 to 10:1) provide manufacturing flexibility while ensuring desired green light emission with peak wavelength 500-580 nm
3Stability of the object's composition
If zinc content is increased, then stability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines broad acceptable ranges for zinc content (0.05 to 0.9 relative mole value) and molar ratios (Zn:In 0.1:1 to 10:1) that provide manufacturing flexibility. These ranges ensure stability while accommodating normal manufacturing variations without requiring extreme precision
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 semiconductor nanoparticle achieves improved optical properties such as high excitation light absorbance, narrow full width at half maximum, and enhanced stability, making it suitable for use in electronic devices like display panels.
Implementation Method 1
The semiconductor nanoparticle may be configured to emit light upon excitation by energy such as incident light or an applied voltage
Data Source
AI summary
A semiconductor nanoparticle including a first semiconductor nanocrystal including silver, indium, gallium, and sulfur, and a semiconductor nanoparticle including a second semiconductor nanocrystal including zinc, gallium, and sulfur, a method of manufacturing the same, and an electronic device including the same. The semiconductor nanoparticle is configured to emit a green light. The green light has a peak emission wavelength of about 500 nanometers to about 580 nanometers. In the semiconductor nanoparticle, a molar ratio of zinc to indium is about 0.1:1 to about 10:1.