LED Structure with Segmented Current Blocking Layers
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Solution Overview
Problem
Conventional light emitting diodes face issues with current blocking layers becoming too thick, leading to breakage at step coverage and reduced light emission due to absorption, and current spreading layers being too thin, which impedes current flow and affects brightness.
Innovation Solution
A light emitting diode structure with multiple current blocking and spreading layers is designed, where the second current blocking layer has a smaller area and thickness compared to the first, and the current spreading layers are formed using indium tin oxide, with the second spreading layer covering both blocking layers to enhance current distribution and prevent breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the current blocking layer is increased to facilitate current spreading, then the current spreading effect is improved, but the current spreading layer becomes too thin and breaks easily at the step coverage area
Solution Approach 1:
The current blocking layer is divided into multiple segments (first current blocking layer and second current blocking layer) with different thicknesses and lateral dimensions. The first current blocking layer has a larger lateral dimension and greater thickness, while the second current blocking layer has a smaller lateral dimension and lesser thickness, allowing each segment to serve different functional requirements without causing breakage
Solution Approach 2:
Different regions of the current blocking layer are assigned different thicknesses and lateral dimensions based on local requirements. The first current blocking layer provides robust blocking where needed, while the second current blocking layer provides localized control, ensuring current spreading layer integrity in critical areas
2Illumination intensity
If the thickness of the current spreading layer is increased to improve brightness, then the brightness is improved, but the current spreading layer absorbs light and results in light emitting loss
Solution Approach 1:
The thickness and lateral dimensions of the current blocking and spreading layers are optimized to specific parameter ranges. The first current blocking layer has a thickness of 50-200 nm and the second has 20-50 nm, with lateral dimensions that balance current spreading effectiveness with light absorption minimization
3Loss of energy
If the thickness of the current spreading layer is decreased to avoid light absorption, then light emitting loss is reduced, but the current spreading layer breaks easily at the step coverage area
Solution Approach 1:
The current blocking structure is segmented into two layers with different thicknesses, allowing the overall structure to maintain adequate current blocking capability while keeping individual layer thicknesses optimized to prevent both light absorption and breakage
4Reliability
If a single-layer current blocking layer is used to block current, then the current distribution is improved, but the current spreading layer becomes too thin and breaks easily
Solution Approach 1:
The current blocking function is divided between two layers with different characteristics, distributing the functional load and reducing stress on any single layer, thereby preventing breakage while maintaining current distribution improvement
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 design improves the yield rate of light emitting diodes by preventing breakage and enhancing brightness by optimizing current flow and light distribution, while maintaining effective current blocking without excessive light absorption.
Implementation Method 1
a current spreading layer covers the current blocking layer so as to increase the brightness and improve the brightness of elements
Implementation Method 2
a light emitting multi-layer structure formed on the substrate by way of stacking
Implementation Method 3
Light emitting diode structure
Data Source
AI summary
A light emitting diode structure is provided. The light emitting diode structure includes a substrate, a light emitting multi-layer structure, a first current blocking layer, a first current spreading layer, a second current blocking layer and a second current spreading layer. The light emitting multi-layer structure is formed on the substrate by way of stacking. The first current blocking layer is formed on part of the light emitting multi-layer structure. The first current spreading layer covers the first current blocking layer and the light emitting multi-layer structure. The second current blocking layer is formed on part of the first current spreading layer. An orthogonal projection of the second current blocking layer is disposed in an orthogonal projection of the first current blocking layer. The second current spreading layer covers the second current blocking layer and the first current spreading layer.