AIGS Nanostructure Films for High-Efficiency Color Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current green heavy metal-free quantum dot (QD) color conversion films for displays have poor photon conversion efficiency due to limited blue light absorption and instability during processing, requiring thicker films and resulting in inefficient energy use.
Innovation Solution
The development of thin, heavy metal-free nanostructure color conversion films using Ag/In/Ga/S (AIGS) nanostructures with specific ligands, processed in an oxygen-free environment, achieving high photon conversion efficiency by incorporating monomers like acrylates and using sacrificial barrier layers to prevent oxygen exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If green heavy metal-free quantum dot films are used for color conversion, then the films are free from toxic heavy metals, but the photon conversion efficiency is poor due to limited blue light absorption
Solution Approach 1:
The patent changes the material composition parameters by using Ag/In/Ga/S tetranuclear clusters with specific stoichiometric ratios and controlling particle size distribution to achieve narrow FWHM (28-38 nm) while maintaining heavy metal-free composition. This resolves the contradiction by optimizing optical parameters without introducing toxic elements.
Solution Approach 2:
The patent creates composite nanostructures combining Ag/In/Ga/S clusters with specific ligands (such as polyamino ligands) to form a composite material system that achieves both heavy metal-free composition and high photon conversion efficiency through synergistic effects of the cluster core and surface ligands.
2Loss of energy
If the film thickness is increased to improve blue light absorption, then sufficient light absorption is achieved, but the film becomes thicker and energy efficiency decreases
Solution Approach 1:
The patent changes the optical absorption parameters by optimizing the Ag/In/Ga/S cluster composition and size distribution to maximize blue light absorption coefficient, enabling thin films (achieve high absorption without increasing thickness. This resolves the contradiction by improving material optical properties rather than increasing geometric dimensions.
3Ease of manufacture
If thermal processing is performed at 180°C for up to 1 hour in the presence of air, then the film is cured and processed, but photon conversion efficiency is reduced due to instability and poor light conversion
Solution Approach 1:
The patent applies inert atmosphere processing by conducting thermal processing and measurement steps in the absence of oxygen (using nitrogen or argon atmosphere), which prevents oxidation and degradation of the Ag/In/Ga/S clusters. This maintains high photon conversion efficiency while still enabling necessary thermal processing, resolving the contradiction between manufacturability and performance reliability.
Solution Approach 2:
The patent applies preliminary protective action by incorporating oxygen-reactive materials and sacrificial barrier layers before thermal processing to prevent oxygen exposure during manufacturing. This preliminary protection maintains the optical stability of the clusters throughout the processing sequence, ensuring high PCE is achieved and maintained.
4Manufacturing precision
If narrow FWHM (28-38 nm) is achieved through polyamino ligands, then emission spectrum is narrowed, but oxygen exposure during processing reduces quantum yield
Solution Approach 1:
The patent maintains the narrow FWHM achieved by polyamino ligands while protecting the quantum yield by conducting all handling, deposition, processing, and measurement in an oxygen-free environment. This prevents oxygen-induced degradation of the ligand-cluster interface, preserving both the narrow emission spectrum and high quantum yield simultaneously.
Solution Approach 2:
The patent uses sacrificial barrier layers and oxygen-reactive materials as intermediary protective elements between the Ag/In/Ga/S clusters and oxygen during processing. These intermediaries absorb or react with oxygen, protecting the sensitive cluster-ligand interface and maintaining both narrow FWHM and high quantum yield through the processing sequence.
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 AIGS nanostructure films exhibit a photon conversion efficiency of greater than 32% at a peak emission wavelength of 480-545 nm when excited by blue light, with improved stability and efficiency through controlled processing conditions, enhancing energy utilization and display performance.
Implementation Method 1
high photon conversion efficiency (PCE) of greater than 32% at a peak emission wavelength of 480-545 nm, when excited using a blue light source with a wavelength about 450 nm
Implementation Method 2
cured by UV irradiation
Data Source
AI summary
Disclosed are films comprising Ag, In, Ga, and S (AIGS) nanostructures and at least one ligand bound to the nanostructures. In some embodiment, 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.