Rod-Shaped AlGaInP LED Structure for Lattice Mismatch Reduction
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Solution Overview
Problem
Inorganic light-emitting diodes face challenges in reducing lattice constant differences between semiconductor layers, leading to defects and inefficient light emission, particularly in high-temperature environments and in manufacturing processes like dielectrophoresis.
Innovation Solution
A light-emitting diode design with a first and second semiconductor region and an active layer, where the second semiconductor region includes sub-layers with varying aluminum to gallium ratios, reducing lattice constant differences and minimizing defects, and an insulating film surrounds the active layer to enhance light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic semiconductor layers are used in light-emitting diodes, then durability in high-temperature environments and blue light efficiency are improved, but lattice constant differences between semiconductor layers cause defects and reduce manufacturing quality
Solution Approach 1:
The second semiconductor layer is divided into multiple sub-layers (first sub-semiconductor layer, second sub-semiconductor layer, third sub-semiconductor layer) with progressively varying AlGaInP compositions. This segmentation allows gradual transition of lattice constants, reducing mismatch defects between layers while maintaining the durability benefits of inorganic semiconductors.
Solution Approach 2:
Each sub-semiconductor layer has a specific AlGaInP composition tailored to its position in the structure. The first sub-layer has higher Al content (M1) closer to the active layer, while subsequent layers have progressively lower Al content (M2, M3), creating local compositional optimization that reduces lattice mismatch at each interface while maintaining overall device durability.
2Ease of manufacture
If inorganic light-emitting diodes are manufactured using dielectrophoresis method, then manufacturing process capability is improved, but lattice constant differences lead to defects that reduce light-emitting quality
Solution Approach 1:
The semiconductor structure is segmented into multiple sub-layers with graded AlGaInP compositions, which can be manufactured using dielectrophoresis method while minimizing defect formation through controlled compositional transitions between layers.
Solution Approach 2:
The AlGaInP compositional parameters (Al content ratio M) are systematically changed across sub-layers to optimize lattice matching. This parameter gradient approach enables dielectrophoresis manufacturing while reducing defect formation caused by lattice constant differences.
3Device complexity
If semiconductor layers with large lattice constant difference are used, then device structure simplicity is maintained, but defect formation increases and light-emitting quality deteriorates
Solution Approach 1:
The semiconductor layer is segmented into multiple sub-layers with graded compositions, which increases structural detail but reduces overall defect formation. This segmentation transforms a simple but defective structure into a more complex yet higher-quality multi-layer structure.
Solution Approach 2:
The light-emitting diode uses composite AlGaInP semiconductor layers with varying compositions in different sub-layers. This composite structure reduces lattice mismatch defects while maintaining manageable device complexity through systematic compositional 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 design improves the quality and durability of red light emission by reducing lattice constant differences and minimizing defects, resulting in more efficient and stable light-emitting diodes suitable for high-temperature applications.
Implementation Method 1
a light-emitting diode may include an organic light-emitting diode (OLED) using an organic material as a fluorescent material, an inorganic light-emitting diode using an inorganic material as the fluorescent material
Data Source
AI summary
A light-emitting diode includes a first semiconductor region having a first conductive type; a second semiconductor region having a second conductive type; and an active layer disposed between the first semiconductor region and the second semiconductor region and including phosphorus (P). The light-emitting diode has a rod shape, the second semiconductor region includes a first semiconductor layer, a second semiconductor layer, and a third semiconductor layer, which are sequentially stacked, the first semiconductor layer is disposed between the active layer and the second semiconductor layer, and the second semiconductor layer includes a compound represented by AlGaInP and satisfying Equation 1.