Wavelength Conversion Device Reflective Layer Thermal Management
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Solution Overview
Problem
Conventional wavelength conversion devices using metal reflective layers suffer from reduced reflectivity and thermal stability due to air penetration and chemical reactions, leading to inefficiencies in light utilization and heat dissipation, particularly under high power and high brightness conditions.
Innovation Solution
A wavelength conversion device with a thin reflective layer composed of aluminum oxide and titanium oxide particles, along with a binder, which achieves high reflectivity (>95%) and improved thermal conductivity by filling voids between reflective particles, thereby enhancing light utilization efficiency and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a micro LED array is used to achieve high resolution and low power consumption, then display quality and energy efficiency are improved, but the requirement for precise wavelength conversion increases device complexity
Solution Approach 1:
The wavelength conversion layer is segmented into multiple distinct layers, each containing quantum dots with specific bandgap energies tailored to convert specific blue LED wavelengths to desired colors. This segmentation enables precise wavelength control while maintaining the simplicity of a single blue LED source, resolving the contradiction between display quality and device complexity.
Solution Approach 2:
The patent changes the parameter of quantum dot bandgap energy across different layers to achieve wavelength conversion. By adjusting the composition and structure of quantum dots in each layer, the system converts a single blue wavelength into multiple precise color wavelengths, improving display quality without adding complex multi-LED structures.
2Manufacturing precision
If multiple quantum dot layers are stacked to achieve precise wavelength conversion, then color accuracy is improved, but light absorption by upper layers reduces overall efficiency
Solution Approach 1:
Each quantum dot layer is designed with local quality optimized for its specific wavelength conversion function. The quantum dots in each layer have precisely controlled bandgap energies that match the conversion needs of that specific layer, ensuring efficient conversion while minimizing unnecessary absorption. This local optimization reduces energy loss while maintaining color accuracy.
3Measurement precision
If quantum dots with different bandgap energies are used in different layers, then wavelength precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent systematically changes the bandgap energy parameter of quantum dots across layers by adjusting their composition and structure. This parameter change approach enables precise wavelength control while using a consistent manufacturing methodology for each layer, making the complex multi-layer structure more manufacturable through standardized processes.
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 results in a high reflectivity and thin reflective layer that maintains thermal stability, improving light emission efficiency and reducing material costs while preventing heat accumulation, thus addressing the limitations of conventional technologies.
Implementation Method 1
a first quantum dot layer including first quantum dots having a first bandgap energy to convert a first wavelength of the micro LED to a first wavelength in a green portion of the visible spectrum; a second quantum dot layer including second quantum dots having a second bandgap energy to convert the first wavelength of the micro LED to a second wavelength in a red portion of the visible spectrum
Implementation Method 2
Each of the plurality of quantum dot layers includes quantum dots having different bandgap energies, such that each of the quantum dot layers converts the blue LED's wavelength to a different wavelength
Data Source
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Figure 3
AI summary
Provided is a wavelength conversion device (100), comprising a substrate (130), a reflecting layer (120), and a light-emitting layer (110) superimposed successively. The light-emitting layer (110) contains a wavelength conversion material and a second binder, and the reflecting layer (120) contains reflecting particles, auxiliary particles, and a first binder. The reflecting particles are used for reflecting light, and the auxiliary particles are used for filling voids between the reflecting particles. The first binder is used for binding the reflecting particles and auxiliary particles into a layer. The reflecting layer (120) not only ensures a higher reflectivity, but also achieves a lower thickness, such that the heat produced by the light-emitting layer (110) can be better transmitted to the substrate through the reflecting layer (120), which avoids a decrease in the light conversion efficiency caused by an excessively high temperature of the light-emitting layer (110). Also disclosed is a light-emitting device comprising such a wavelength conversion device (100).