AIGS Nanostructure Films for Stable Blue Light Conversion
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Solution Overview
Problem
Current color conversion thin films used in lighting and display applications have limited photon conversion efficiency due to poor absorption and instability, especially when exposed to yellow light and air storage conditions, and require thicker films to absorb blue light effectively, which is often achieved with heavy metals like Cd and Pb that need to be avoided.
Innovation Solution
Development of thin, heavy metal-free Ag—In—Ga—S nanostructure color conversion films using metal alkoxides, alkoxide hydrolysis products, metal halides, and organometallic compounds, with specific ligands, processed in an oxygen-free environment to achieve high photon conversion efficiency and stability, especially when exposed to yellow light and air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heavy metal-based color conversion materials are used, then blue light absorption efficiency is improved, but environmental safety and material toxicity are worsened
Solution Approach 1:
The patent changes the material composition parameters by replacing heavy metal elements with Ag-In-Ga-S quantum dots, adjusting the stoichiometric ratios and size distribution to optimize blue light absorption while eliminating toxic effects. The quantum dot size is controlled at 2-5 nm to achieve optimal optical properties without heavy metals.
Solution Approach 2:
The patent creates a composite material system combining Ag-In-Ga-S quantum dots with organic ligands and matrix materials. This composite structure enables the quantum dots to maintain high blue light absorption efficiency while the organic components provide stability and non-toxicity, resolving the contradiction between performance and environmental safety.
2Productivity
If film thickness is increased to improve blue light absorption, then photon conversion efficiency is improved, but light transmission and device complexity are worsened
Solution Approach 1:
The patent changes the optical parameters of the material by using quantum-confined Ag-In-Ga-S nanostructures with tuned band gaps that strongly absorb blue light. This enables high photon conversion efficiency in thin films (50-200 nm) rather than requiring thick layers, as the quantum dots have superior absorption coefficients compared to bulk materials.
Solution Approach 2:
The patent transitions from bulk material absorption to quantum-confined absorption by reducing dimensionality to 0D quantum dots. This dimensional change creates strong excitonic absorption in the blue region, achieving high photon conversion efficiency without increasing film thickness, thus resolving the contradiction between PCE and film thickness.
3Stability of the object's composition
If conventional QD films are exposed to air and yellow light for processing, then film stability is improved through curing, but photon conversion efficiency deteriorates due to oxidation and degradation
Solution Approach 1:
The patent employs inert atmosphere handling (nitrogen or argon environment) during quantum dot synthesis, ink preparation, and film deposition processes. This prevents oxidation of the Ag-In-Ga-S quantum dots and organic ligands, maintaining high photon conversion efficiency while allowing necessary processing steps to occur without degradation.
Solution Approach 2:
The patent performs preliminary stabilization by synthesizing the quantum dots with protective ligand shells and conducting ink formulation with antioxidant additives before exposure to air. This preliminary protection maintains photon conversion efficiency during subsequent handling and processing, resolving the contradiction between stability and efficiency.
4Object-affected harmful factors
If green heavy metal-free QD films are used, then environmental safety is improved, but blue light absorption capability is worsened due to material system limitations
Solution Approach 1:
The patent changes the optical parameters by precisely controlling the quantum dot size (2-5 nm) and composition ratios of Ag, In, Ga, and S elements. This tuning creates strong absorption in the blue region (430-480 nm) while maintaining the heavy metal-free composition, resolving the contradiction between environmental safety and absorption capability.
Solution Approach 2:
The patent creates a composite Ag-In-Ga-S quantum dot system that combines multiple elements to achieve complementary absorption characteristics. The synergistic interaction between different elements in the quantum dot structure enables strong blue light absorption without requiring heavy metals, resolving the contradiction between green composition and absorption capability.
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 films exhibit photon conversion efficiencies greater than 30% at a peak emission wavelength of 480-545 nm when excited by blue light, maintaining stability and efficiency even after exposure to yellow light and air storage conditions, with improved blue absorption and moderate emission properties.
Implementation Method 1
high photon conversion efficiency (PCE) of greater than 30% at a peak emission wavelength of 480-545 nm, when excited using a blue light source with a wavelength of about 450 nm
Implementation Method 2
an ink formulation containing one or more metal alkoxides, one or more metal alkoxide hydrolysis products, one or more metal halides, one or more metal halide hydrolysis products
Data Source
AI summary
Disclosed are stable films comprising Ag, In, Ga, and S (AIGS) nanostructures, or more one metal alkoxides, one or more metal alkoxide hydrolysis products, one or more metal halides, one or more metal halide hydrolysis products, one or more organometallic compounds, or one or more organometallic hydrolysis products, or combinations thereof, and at least one ligand bound to the nanostructures. In some embodiments, the AIGS nanostructures have a photon conversion efficiency of greater than 32% and a peak wavelength emission of 480-545 nm. In some embodiments, the nanostructures have an emission spectrum with a FWHM of 24-38 nm. In some embodiments, the nanostructures have a photon conversion efficiency (PCE) of at least 30% after being stored for 24 hours under yellow light and air storage conditions.