Optoelectronic Component Split Conversion Element Design
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Solution Overview
Problem
Optoelectronic components face challenges in efficient radiation output coupling and long service life due to aging of matrix materials in conversion elements, particularly caused by high refractive indices and temperatures, which lead to reduced extraction efficiency and thermal instability.
Innovation Solution
A split conversion element design with a first layer having a higher refractive index matrix material close to the semiconductor chip for efficient heat dissipation and a second layer with a lower refractive index matrix material further away, reducing thermal stress and maintaining extraction efficiency while minimizing aging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conversion element with high refractive index matrix material is used, then radiation extraction efficiency is improved, but thermal stability and service life deteriorate due to aging at high temperatures
Solution Approach 1:
The conversion element is divided into multiple layers with different matrix materials having different refractive indices. The first layer has higher refractive index for better extraction efficiency, while the second layer has lower refractive index for improved thermal stability, thus segmenting the functional requirements across different layers
Solution Approach 2:
Different regions of the conversion element are assigned different material properties: the first layer (closer to semiconductor chip) uses high refractive index material for extraction efficiency, while the second layer (farther from chip) uses low refractive index material for thermal stability, creating local quality differentiation to balance competing requirements
2Device complexity
If a single layer conversion element is used, then device complexity is reduced, but both extraction efficiency and thermal management cannot be optimized simultaneously
Solution Approach 1:
The conversion element is segmented into multiple layers, each with optimized refractive index properties. This segmentation allows simultaneous optimization of extraction efficiency (first layer) and thermal management (second layer), achieving both goals that cannot be met with a single layer structure
3Productivity
If high refractive index matrix material is used throughout, then radiation output coupling is enhanced, but aging accelerates due to thermal stress
Solution Approach 1:
The conversion element is divided into layers with different refractive indices. The first layer uses high refractive index material to enhance radiation output coupling, while the second layer uses low refractive index material to reduce thermal stress and aging, thus segmenting the conflicting requirements
Solution Approach 2:
Different layers are assigned different material qualities based on their functional requirements: high refractive index material in the first layer for output coupling enhancement, and low refractive index material in the second layer for aging resistance, creating local quality differentiation
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 enhances radiation output coupling efficiency and extends the service life of optoelectronic components by balancing refractive index differences between layers to manage heat dissipation and thermal stability, achieving comparable luminous intensities with reduced aging effects.
Implementation Method 1
The first layer (21) comprises a first matrix material (210) with a higher refractive index than the second matrix material (220) of the second layer (22)
Implementation Method 2
The first layer (21) comprises a first matrix material (210) with phosphors (211) incorporated therein. The second layer (22) comprises a second matrix material (220) with phosphors (221) incorporated therein
Implementation Method 3
The first layer (21) is arranged between the second layer (22) and the emission side (10)
Data Source
AI summary
The invention relates to an optoelectronic component, which, in at least one embodiment, comprises an optoelectronic semiconductor chip having an emission side and a conversion element on the emission side. The conversion element is configured for conversion of a primary beam emitted by the semiconductor chip in operation as intended. The conversion element is divided into at least one first layer and one second layer. The first layer is arranged between the second layer and the emission side. The first layer comprises a first matrix material having fluorescent particles introduced therein. The second layer comprises a second matrix material having fluorescent particles introduced therein. The first matrix material of the first layer has a higher index of refraction than the second matrix material of the second layer.