Wavelength Conversion Member Oxygen Protection
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Solution Overview
Problem
Existing wavelength conversion members with quantum dots suffer from decreased emission intensity due to oxygen permeation, especially when cut to size, and the presence of large amounts of light stabilizers and reducing agents in polymerizable compositions can inhibit curing reactions, leading to low-polymerization-degree components that affect durability.
Innovation Solution
A wavelength conversion member is designed with a wavelength conversion layer containing quantum dots, an antioxidant interposing layer, and a barrier layer, where the antioxidant interposing layer is adjacent to the wavelength conversion layer and the barrier layer is formed on its surface, with a low content of low-polymerization-degree components to prevent photooxidation and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier film is provided outside of the QD layer to suppress oxygen permeation, then oxygen protection is improved, but emission intensity decreases due to photooxidation at cut surfaces
Solution Approach 1:
The patent applies different protective strategies to different regions: the barrier film covers the main surfaces while the antioxidant provides localized protection at cut surfaces where oxygen permeation is most problematic. This localized approach maintains emission intensity by specifically targeting the vulnerable cut surfaces without compromising the overall optical properties.
Solution Approach 2:
The antioxidant acts as an intermediary substance that mediates between the quantum dots and oxygen. It is incorporated into the QD layer or applied as a coating on cut surfaces, serving as a chemical barrier that prevents photooxidation while allowing the barrier film to provide physical protection, thereby maintaining emission intensity.
2Reliability
If large amounts of light stabilizer and reducing agent are added to polymerizable composition, then photooxidation resistance is improved, but curing reaction is inhibited leading to low-polymerization-degree components
Solution Approach 1:
The patent optimizes the concentration parameters of light stabilizers and reducing agents within specific ranges (light stabilizer: 0.01-5 wt%, reducing agent: 0.01-5 wt%) to achieve the desired photooxidation resistance while minimizing their inhibitory effect on curing reactions, thereby balancing both protection and durability.
Solution Approach 2:
The patent creates a composite polymerizable composition that combines quantum dots, polymerizable monomers, light stabilizers, and reducing agents in specific proportions. This composite formulation ensures that the protective additives work synergistically while maintaining adequate curing performance and minimizing low-polymerization-degree components.
3Reliability
If antioxidant is incorporated into the QD layer or applied as coating, then photooxidation prevention is improved, but device complexity increases
Solution Approach 1:
The patent merges the antioxidant protection function with the existing QD layer structure by incorporating antioxidants directly into the polymerizable composition that forms the QD layer. This integration approach provides photooxidation prevention without adding separate protective layers, thereby avoiding increased device 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 configuration effectively prevents photooxidation of quantum dots, maintains high emission intensity, and improves the durability of the wavelength conversion member by controlling the content of low-polymerization-degree components, ensuring consistent brightness and longevity.
Implementation Method 1
a wavelength conversion layer including quantum dots which emit fluorescence by irradiation with excitation light
Implementation Method 2
a barrier layer that suppresses permeation of oxygen into the wavelength conversion layer
Data Source
AI summary
A wavelength conversion member is provided. The wavelength conversion member includes: a wavelength conversion layer including at least one kind of quantum dots that are excited by excitation light to emit fluorescence and an antioxidant; at least one interposing layer that is formed to be adjacent to the wavelength conversion layer; and a barrier layer that is formed on at least one surface of the wavelength conversion layer, in which at least one layer of the interposing layers is an antioxidant-containing interposing layer including the antioxidant.