Nano-Scale Red LED Active Layers for Strain and Defect Control
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Solution Overview
Problem
Existing semiconductor light emitting diodes (LEDs) face efficiency reductions due to lattice mismatch and strain issues when increasing indium concentration, leading to defects and phase separation, particularly when emitting red light, which limits their emission efficiency.
Innovation Solution
The design incorporates a semiconductor LED structure with nano-scale active elements on a first semiconductor layer, where each active element has a width between 10 nm and 100 nm and is in a strain state, reducing defects and maintaining strain through precise width and thickness control, and an insulating layer with a mesh structure is used between these elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If indium concentration is increased to improve red light emission efficiency, then light emission efficiency is improved, but lattice mismatch and strain issues worsen leading to defects and phase separation
Solution Approach 1:
The active layer is divided into multiple quantum well layers (first quantum well layer, second quantum well layer, third quantum well layer) with different indium concentrations. This segmentation allows each layer to have optimized indium content for red light emission while distributing strain across multiple interfaces, preventing catastrophic defect formation that would occur in a single high-indium layer.
Solution Approach 2:
Different quantum well layers have different indium concentrations tailored to their specific positions and functions. The first quantum well layer has higher indium concentration for primary red emission, while other layers have adjusted concentrations to manage strain and provide secondary emission, creating local optimization throughout the structure.
2Reliability
If active layer width is reduced to maintain strain and reduce defects, then reliability is improved, but manufacturing precision requirements worsen
Solution Approach 1:
The active layer is segmented into multiple quantum well layers with controlled widths. By dividing the total active region into several thinner layers, each layer can maintain strain more effectively while the cumulative structure achieves the desired overall performance, reducing the precision burden on any single layer's width.
Solution Approach 2:
The indium concentration and width parameters are systematically varied across different quantum well layers. This parameter optimization allows each layer to be designed within manufacturable tolerances while collectively achieving the strain maintenance and emission efficiency goals.
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
This approach enhances light emission efficiency by minimizing defects and maintaining strain, allowing for high-efficiency red light emission even with high indium concentrations, thereby overcoming the limitations of existing LEDs.
Implementation Method 1
a plurality of active elements disposed on the first semiconductor layer, each of the plurality of active elements spaced apart from each other and having a width less than a width of the first semiconductor layer
Data Source
AI summary
A semiconductor light emitting diode (LED) and a method of manufacturing the same are provided. The LED includes a first semiconductor layer; a plurality of active elements spaced apart on the first semiconductor layer and each having a width less than a width of the first semiconductor layer; and a second semiconductor layer disposed on the plurality of active elements.