LED Electrode Structure for Bond Reliability and Reduced Light Shielding
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Solution Overview
Problem
Existing light emitting diodes (LEDs) face challenges in wiring reliability and light emission efficiency due to surface flatness of wiring electrodes, impact force dispersion, material shielding, and light reflection and absorption during output.
Innovation Solution
The design includes a semiconductor epitaxial stacked layer with contact and wiring electrodes, where the horizontal projections of the wiring electrodes are positioned within the contact electrodes' projections on the semiconductor epitaxial stacked layer, enhancing contact area and force dispersion, and a bonding layer with a refractive index between the semiconductor and substrate to reduce reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wiring electrode area is increased to improve contact reliability, then the wiring reliability is improved, but the light extraction efficiency deteriorates due to increased shielding
Solution Approach 1:
The electrode structure is segmented into two distinct parts: contact electrodes with larger area for reliable electrical connection, and wiring electrodes with smaller area for light extraction. This segmentation allows each component to optimize its function without compromising the other.
Solution Approach 2:
Different regions of the electrode structure are assigned different qualities: the contact electrode region has larger area for mechanical reliability, while the wiring electrode region has smaller area for optical performance. This local differentiation resolves the contradiction between electrical reliability and light extraction efficiency.
2Reliability
If the contact area between wiring electrode and contact electrode is increased to improve wiring reliability, then the wiring reliability is improved, but the impact force concentration increases during wiring process
Solution Approach 1:
The electrode structure is segmented into two distinct parts: contact electrodes with larger area for reliable electrical connection, and wiring electrodes with smaller area for light extraction. This segmentation allows each component to optimize its function without compromising the other.
Solution Approach 2:
The contact electrode serves as a cushioning layer that absorbs and disperses impact forces before they reach the wiring electrode. This beforehand cushioning protects the wiring electrode from damage during the wiring process while maintaining good electrical contact.
3Reliability
If packaging shielding is added to protect wiring electrodes, then the wiring reliability is improved, but the light extraction efficiency deteriorates due to increased absorption and reflection
Solution Approach 1:
The electrode structure is segmented into two distinct parts: contact electrodes with larger area for reliable electrical connection, and wiring electrodes with smaller area for light extraction. This segmentation allows each component to optimize its function without compromising the other.
Solution Approach 2:
The contact electrode acts as an intermediary between the wiring electrode and the semiconductor layer, providing mechanical support and electrical connection while minimizing optical interference. This intermediary structure protects the wiring electrode without significantly blocking light extraction.
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 configuration improves the reliability and light emission efficiency of LEDs by ensuring good contact between wiring and contact electrodes, effectively dispersing impact forces and minimizing light absorption, thereby enhancing overall performance.
Implementation Method 1
reflection at the interfaces of materials with different refractive indexes during the light output process
Implementation Method 2
reflection at the interfaces of materials with different refractive indexes during the light output process
Data Source
AI summary
A light emitting diode and a light emitting device are provided. The light emitting diode includes: a semiconductor epitaxial stacked layer at least including a first conductive type semiconductor layer, an active layer, and a second conductive type semiconductor layer and formed with a first mesa; a first contact electrode located on the first mesa and electrically connected to the first conductive type semiconductor layer; a second contact electrode located on the second conductive type semiconductor layer and electrically connected to the second conductive type semiconductor layer; and a first wiring electrode and a second wiring electrode located on the first contact electrode and the second contact electrode. Horizontal projections of the first wiring electrode and the second wiring electrode on the semiconductor epitaxial stacked layer fall within horizontal projections of the first contact electrode and the second contact electrode.