LED Electrode Segmentation for Current Crowding
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Solution Overview
Problem
Current crowding in light emitting diodes (LEDs) leads to non-uniform current density distribution, reducing optical and electrical performance, and causing localized overheating due to the non-homogeneous distribution of current through semiconductor regions, especially near wire bond pads and across the p-n junction.
Innovation Solution
The use of electrodes with two physically separated traces and a wire bond connection to distribute current more uniformly across the semiconductor material, reducing current crowding by providing shorter current paths and a more uniform current density distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single continuous electrode is used to connect wire bond pads, then electrical connectivity is achieved, but current crowding occurs leading to non-uniform current density distribution
Solution Approach 1:
The electrode is divided into multiple separate traces instead of using a single continuous electrode. These segmented traces are positioned to extend from the wire bond pad toward the p-n junction, creating multiple current pathways that distribute current more uniformly and reduce current crowding effects.
2Illumination intensity
If current density is increased to improve LED output, then optical performance improves, but localized overheating and thermal hot spots occur
Solution Approach 1:
By segmenting the electrode into multiple traces, the current is distributed across several pathways rather than concentrating through a single electrode. This segmentation reduces localized current density and prevents thermal hot spots, allowing higher overall current density to be applied safely to improve optical performance.
Solution Approach 2:
The electrode traces are strategically positioned to provide enhanced current distribution in specific regions where current crowding occurs. The traces extend from the wire bond pad toward the p-n junction, creating localized current pathways that improve current uniformity in critical areas without requiring uniform electrode coverage throughout the entire device.
3Power
If electrode traces are placed close together to minimize resistance, then electrical conductivity improves, but current crowding persists
Solution Approach 1:
The electrode is segmented into multiple traces with optimized spacing. The traces are positioned close enough to maintain low overall resistance and good electrical conductivity, but spaced sufficiently to create distinct current pathways that prevent current crowding. This segmentation allows the electrode to achieve both low resistance and uniform current distribution.
Data Source
AI summary
A light emitting apparatus includes a semiconductor layer having an electrode with two traces physically separated from one another. The light emitting apparatus further includes a wire bond electrically connecting the two traces.