Light Conversion Member Gas Barrier Refractive Index
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The formation of an unplanned barrier layer in light conversion members using quantum dots can lead to reduced light transmittance and emission intensity due to photooxidation reactions with moisture and oxygen, limiting the achievable luminance.
Innovation Solution
A light conversion member design incorporating gas barriers with optimized gas barrier layers made of inorganic materials like SiCN or SiO2, which enhance light transmittance for specific colors, preventing moisture and gas infiltration and maintaining higher luminance output by adjusting the refractive index and thickness of these layers to exceed the transmittance of the base material alone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier layer is formed to protect quantum dots from moisture and oxygen, then reliability is improved, but light transmittance deteriorates
Solution Approach 1:
The gas barrier is constructed as a composite structure with multiple layers having different refractive indices (first gas barrier layer with refractive index 1.4-1.6, second gas barrier layer with refractive index 1.7-1.9). This composite approach allows the barrier to provide both protection and optical enhancement through refractive index management.
Solution Approach 2:
The invention changes the refractive index parameter of the gas barrier layers to optimize light transmittance. By controlling the refractive index of each layer (first layer: 1.4-1.6, second layer: 1.7-1.9) and their thicknesses (5-20 nm each), the barrier provides higher light transmittance than the base material alone while maintaining protection functionality.
2Reliability
If a conventional barrier layer is laminated on the light conversion film, then protection from photooxidation is improved, but light transmittance and output luminance deteriorate
Solution Approach 1:
The gas barrier uses a composite multi-layer structure with alternating refractive indices that provides both photooxidation protection and enhanced light transmittance. The specific combination of SiCN and SiO2 layers creates optical interference effects that increase transmittance while maintaining barrier functionality.
Solution Approach 2:
The invention applies different material properties to different layers of the gas barrier. The first gas barrier layer (SiCN, refractive index 1.4-1.6) and second gas barrier layer (SiO2, refractive index 1.7-1.9) have locally optimized properties that collectively provide both protection and enhanced optical performance.
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
This design increases the amount of incident and converted light, achieving higher output luminance while minimizing light loss, particularly for blue, red, and green light, and reducing power consumption in display applications.
Implementation Method 1
a first gas barrier (5) that is made up of one or more gas barrier layers that prevent moisture and gas from entering the light conversion film (4)
Implementation Method 2
When blue light from a backlight is incident on a light conversion film including quantum dots, it is emitted after being converted into red and green light by two types of quantum dots of different sizes
Implementation Method 3
the light transmittance of the first base material (6) combined with the first gas barrier (5) is higher than a light transmittance of the first base material (6) alone
Data Source
AI summary
A light conversion member includes a light conversion film, a first gas barrier, and a first base material. The light conversion film converts color of light from a specific color. The first gas barrier is located on a side of the light conversion film where the light to be converted is incident. The first gas barrier includes one or more gas barrier layers that prevent moisture and gas from entering the light conversion film. The first base material is located on an opposite side of the first gas barrier from a face on which the light conversion film is located. The first base material transmits the light and holds the light conversion film and the first gas barrier. For a light of the specific color, a light transmittance of the first base material combined with the first gas barrier is higher than a light transmittance of the first base material alone.