Color Conversion Panel Using Cadmium-Free Luminescent Nanoparticles
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Solution Overview
Problem
Current semiconductor nanoparticles used in color conversion panels face challenges in achieving high absorbance, narrow full width at half maximum, and high luminous efficiency while maintaining stability and being environmentally friendly, particularly due to limitations with cadmium-free Group III-V compounds.
Innovation Solution
A semiconductor nanoparticle composition including silver, a Group 13 metal (indium or gallium), zinc, and a chalcogen element (sulfur or selenium) with specific mole ratios and a charge balance value, configured to emit light with improved optical properties and stability, is used in a color conversion panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If cadmium-free Group III-V compounds are used in semiconductor nanoparticles, then environmental friendliness is improved, but optical properties (absorbance, full width at half maximum, luminous efficiency) deteriorate
Solution Approach 1:
The patent uses composite semiconductor nanoparticles containing multiple elements (In, Ga, Zn, S, Se) in specific combinations to achieve both environmental friendliness (cadmium-free) and superior optical properties. The composite structure allows synergistic effects where zinc enhances luminescence efficiency while group 13 metals provide bandgap control, resolving the contradiction between eco-friendliness and performance
Solution Approach 2:
The patent systematically varies compositional parameters (mole ratios of In:Ga:Zn, S:Se ratios, particle size 2-50 nm) to optimize optical properties. By changing these parameters, the nanoparticles achieve narrow FWHM (30-80 nm) and high quantum yield (50-90%) while maintaining cadmium-free composition, thus resolving the contradiction through precise parameter control
2Manufacturing precision
If semiconductor nanoparticle composition is optimized for high absorbance and narrow emission, then optical performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent establishes specific parameter ranges (In:Ga ratio 1:4 to 4:1, Zn content 10-70%, particle size 2-50 nm) that guarantee narrow FWHM (30-80 nm) and high quantum yield (50-90%). These defined parameters simplify manufacturing by providing clear targets while achieving precise emission control, resolving the contradiction between precision and complexity
Solution Approach 2:
The patent introduces zinc specifically at the nanoparticle surface or as a core component to enhance luminescence efficiency, while group 13 metals (In, Ga) provide the bulk bandgap control. This localized functional assignment allows each element to optimize specific properties, achieving narrow emission and high absorbance without excessive overall complexity
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 enhanced blue light absorbance, narrow emission spectrum, and high quantum yield, while maintaining stability and cost-effectiveness, suitable for various display devices including TVs and mobile devices.
Implementation Method 1
enhanced blue light absorbance
Implementation Method 2
high quantum yield
Implementation Method 3
configured to emit light upon excitation by an energy such as an incident light
Data Source
AI summary
A color conversion panel, comprising a color conversion layer comprising a color conversion region and optionally a partition wall defining each region of the color conversion layer, wherein the color conversion region comprises a first region corresponding to a first pixel, the first region comprises a first composite, the first composite comprises a matrix and a semiconductor nanoparticle, wherein the semiconductor nanoparticle is dispersed in the matrix, the semiconductor nanoparticle comprises silver, a Group 13 metal, zinc, and a chalcogen element, the semiconductor nanoparticle emits a first light, the Group 13 metal is indium, gallium, aluminum, or a combination thereof, the chalcogen element is sulfur, selenium, or a combination thereof, and in the semiconductor nanoparticle, a mole ratio of zinc to a total sum of silver, Group 13 metal, and zinc is greater than or equal to about 0.01:1.