Light Conversion Device with Resin Sealing for Quantum Dot Durability
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Solution Overview
Problem
Existing light conversion devices using quantum dots face challenges with durability, oxygen and moisture blocking, formability, and photo-efficiency, particularly due to the brittleness of glass containers and difficulties in shaping and processing.
Innovation Solution
A light conversion device with a frame that includes a substrate with a light conversion layer, sealed by inorganic and organic layers, which enhances durability and formability, and improves photo-efficiency by using quantum dots that convert incident light into specific colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum dots are dispersed in an organic solvent and maintained in a glass container, then oxygen and moisture blocking properties are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The device is divided into distinct functional layers: a substrate layer, a light conversion layer with quantum dots, and a resin layer. This segmentation allows each layer to be optimized independently - the substrate provides structural support, the light conversion layer contains the quantum dots in a controlled environment, and the resin layer provides protection and sealing, thereby reducing overall device complexity while maintaining reliability
Solution Approach 2:
The resin layer acts as an intermediary between the light conversion layer and the external environment. It seals the quantum dots from oxygen and moisture without requiring complex glass container structures, thus improving oxygen and moisture blocking properties while simplifying the overall device design
2Reliability
If glass containers are used to encapsulate quantum dots, then oxygen and moisture blocking properties are improved, but formability and ease of manufacture deteriorate due to brittleness
Solution Approach 1:
The patent changes the material parameter from brittle glass to flexible resin. The resin layer can be applied through conventional coating techniques, cured to form a protective barrier, and then processed into various shapes without the risk of cracking or breaking, thereby improving ease of manufacture while maintaining oxygen and moisture blocking properties
Solution Approach 2:
The device uses a composite structure combining substrate, light conversion layer with quantum dots, and resin layer. This composite material approach allows the resin to provide both the oxygen and moisture blocking function and the formability needed for easy manufacturing, eliminating the need for brittle glass containers
3Use of energy by moving object
If quantum dots are exposed to oxygen or moisture, then photo-efficiency deteriorates, but maintaining natural state requires complex glass container structures
Solution Approach 1:
The resin layer creates an inert environment for the quantum dots by providing a barrier against oxygen and moisture. This simple resin-based approach achieves the same protective function as complex glass container structures, thereby maintaining photo-efficiency while reducing device complexity
Solution Approach 2:
The resin layer functions as a flexible thin film that seals the quantum dots from environmental degradation. This thin film approach provides effective protection against oxygen and moisture without requiring bulky or complex glass container structures, thus maintaining photo-efficiency while simplifying device design
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 provides a light conversion device with improved durability, oxygen and moisture blocking properties, and enhanced photo-efficiency, allowing for easier fabrication and various shapes, compared to traditional glass capillary devices.
Implementation Method 1
A quantum dot is a nanocrystal semiconductor material having a diameter of less than or equal to around 10 nanometers (nm), which shows quantum confinement effects. The quantum dot generates stronger light in a relatively narrow light wavelength range than a phosphor.
Implementation Method 2
a light conversion layer which is disposed on the substrate and receives the light of the first color from the light source, the light conversion layer including a light converting particle which converts the light of the first color to the light of the second color
Implementation Method 3
when the quantum dot is exposed to oxygen or moisture, the luminous efficiency thereof may be reduced. To not reduce luminous efficiency, a resin dispersed with the quantum dots is disposed in a glass container such as a tube or capillary to maintain a natural state of the quantum dots.
Data Source
AI summary
A light conversion device includes a frame through which incident light is received from a light source and converted light is emitted from the light conversion device, the frame including: an opening through which light of a first color is received from the light source and from which light of a second color is emitted from the light conversion device, and a wall which surrounds the opening, a substrate in the opening and supported by the wall, a light conversion layer which is disposed on the substrate and receives the light of the first color from the light source, the light conversion layer including a light converting particle which converts the light of the first color to the light of the second color, a first inorganic layer disposed on the light conversion layer, and a first organic layer disposed on the first inorganic layer.