Quantum Dot Wavelength Conversion Layer Oxygen Barrier
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Solution Overview
Problem
Quantum dots in wavelength conversion members degrade due to oxygen exposure, leading to reduced light emission efficiency, and existing solutions like barrier films and coatings have limitations in productivity and effectiveness.
Innovation Solution
A wavelength conversion member with a wavelength conversion layer containing quantum dots and an oxygen permeability coefficient-reducing agent, which reduces oxygen permeability by at least 30% per 10 parts by weight, is developed, maintaining light emission efficiency while maintaining productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used in wavelength conversion members, then color reproduction and brightness are improved, but light emission efficiency deteriorates due to oxygen exposure causing photooxidation
Solution Approach 1:
An oxygen permeability coefficient-reducing agent is introduced as an intermediary substance within the wavelength conversion layer. This agent acts as a mediator that reduces oxygen permeability by 30% or more per 10 parts by weight, preventing oxygen from reaching the quantum dots and causing photooxidation, while allowing the quantum dots to maintain their high brightness and color reproduction properties
Solution Approach 2:
The invention creates an inert environment within the wavelength conversion layer by reducing oxygen permeability through the addition of oxygen permeability coefficient-reducing agents. This effectively establishes an oxygen-deficient atmosphere that protects the quantum dots from photooxidation degradation, maintaining light emission efficiency while preserving the brightness enhancement benefits of quantum dots
2Reliability
If barrier films are applied to protect quantum dots from oxygen, then light emission efficiency is maintained, but productivity decreases due to additional manufacturing steps
Solution Approach 1:
The invention merges the protective function against oxygen with the existing wavelength conversion layer by incorporating oxygen permeability coefficient-reducing agents directly into the layer composition. This combines the quantum dot-containing wavelength conversion function and the oxygen barrier protection function into a single integrated structure, eliminating the need for separate barrier films and maintaining productivity
Solution Approach 2:
The wavelength conversion layer is designed to perform multiple functions simultaneously: it converts light wavelength (providing color) and provides oxygen barrier protection (maintaining efficiency). The oxygen permeability coefficient-reducing agents enable the layer to serve dual purposes, making the structure universal and eliminating the need for additional specialized protective layers
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 solution effectively suppresses oxygen contamination, maintaining high light emission efficiency and productivity by reducing oxygen permeability in the wavelength conversion layer, thereby enhancing the performance of liquid crystal display devices.
Implementation Method 1
when exciting light enters a wavelength conversion member containing quantum dots from a backlight, the quantum dots are excited to emit fluorescence
Implementation Method 2
at least one oxygen permeability coefficient-reducing agent... reducing the oxygen permeability coefficient per 1 mm thickness of the wavelength conversion layer by equal to or more than 30% per 10 parts by weight
Data Source
AI summary
An aspect of the present invention relates to a wavelength conversion member, which comprises a wavelength conversion layer, wherein the wavelength conversion layer comprises at least one quantum dot which has a property of being excited with exciting light to emit fluorescence, and at least one oxygen permeability coefficient-reducing agent, an oxygen permeability coefficient per 1 mm thickness of the wavelength conversion layer is less than 150.0 cm3/m2/day/atm, and the oxygen permeability coefficient-reducing agent is a compound which exhibits an oxygen permeability coefficient-reducing capability of reducing the oxygen permeability coefficient per 1 mm thickness of the wavelength conversion layer by equal to or more than 30% per 10 parts by weight of the oxygen permeability coefficient-reducing agent relative to 100 parts by weight of the wavelength conversion layer except for the oxygen permeability coefficient-reducing agent.