Light Conversion Plate Protrusion Patterns for LED Efficiency
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Solution Overview
Problem
Current quantum dot-based light-emitting diode (LED) packages face issues with degradation due to heat and moisture, leading to non-uniform distribution and reduced luminous efficiency, as well as limited compatibility with sealing resins, which affects brightness and color reproducibility.
Innovation Solution
A light conversion plate with a quantum dot layer protected by an inorganic ligand layer and glass substrates, featuring protrusion patterns on the glass surfaces to enhance light extraction and prevent degradation, along with an air gap or low refractive index layer between the encapsulation layer and the light conversion plate to improve luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If quantum dots are capped with hydrophobic ligand for dispersibility improvement, then dispersibility is improved, but compatibility with sealing resin deteriorates
Solution Approach 1:
A silane coupling agent is introduced as an intermediary substance between the hydrophobic ligand-capped quantum dots and the hydrophilic sealing resin. The silane coupling agent contains both hydrophobic and hydrophilic functional groups, allowing it to bridge the interface between quantum dots and sealing resin, thereby improving compatibility and adhesion without compromising dispersibility
Solution Approach 2:
The patent creates a composite structure where quantum dots, silane coupling agent, and sealing resin form a multi-component system. The silane coupling agent forms a transitional layer that combines properties of both hydrophobic and hydrophilic materials, enabling effective integration of quantum dots into the sealing resin matrix
2Illumination intensity
If quantum dots are used to improve brightness and color reproducibility, then luminous efficiency is improved, but degradation by heat and moisture worsens
Solution Approach 1:
The patent applies silane coupling agent treatment to quantum dots before encapsulation, creating a protective transitional layer that preemptively shields quantum dots from heat and moisture damage. This prior protection prevents degradation during operation while maintaining the quantum dots' optical performance
Solution Approach 2:
The silane coupling agent serves as a protective intermediary between the quantum dots and the external environment (heat and moisture). This intermediary layer provides thermal and moisture barrier functions while maintaining the quantum dots' luminous properties
3Illumination intensity
If protrusion patterns are formed on glass substrate to enhance light extraction, then light extraction is improved, but manufacturing complexity increases
Solution Approach 1:
The patent forms protrusion patterns with curved or spherical surfaces on the glass substrate. These curved structures enhance light extraction through increased scattering and reduced total internal reflection, while the standardized spherical geometry allows for relatively simple manufacturing processes such as laser writing or photoresist-based patterning
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 prevents quantum dot degradation, enhances light extraction, and improves luminous efficiency by up to 8% through reduced reflection and increased light recycling, achieving high brightness and color reproducibility in LED packages.
Implementation Method 1
A light conversion plate with a quantum dot layer protected by an inorganic ligand layer and glass substrates
Implementation Method 2
featuring protrusion patterns on the glass surfaces to enhance light extraction and prevent degradation
Implementation Method 3
an air gap or low refractive index layer between the encapsulation layer and the light conversion plate to improve luminous efficiency
Implementation Method 4
a light conversion plate with a quantum dot layer protected by an inorganic ligand layer
Implementation Method 5
along with an air gap or low refractive index layer between the encapsulation layer and the light conversion plate to improve luminous efficiency
Data Source
Figure 1~3
Figure 4~5(C)
Figure 6~7
AI summary
A light conversion plate (10) including a first glass substrate (11); a light conversion layer (13) disposed on the first glass substrate (11) and including quantum dots (17) that convert incident light into light having a specific wavelength range; and a second glass substrate (15) disposed on the light conversion layer (13). Further, a surface of at least one of the first glass substrate (11) and the second glass substrate (15) includes protrusion patterns.