UV LED Chip with Insulated Epitaxial Segments
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Solution Overview
Problem
Ultraviolet LED chips face issues with poor heat dissipation and electrostatic discharging hazards, which affect their performance and reliability.
Innovation Solution
The ultraviolet LED chip design includes an epitaxial structure with an insulating layer to isolate it into two structures, a groove contacting layer that connects the N-type AlGaN layer electrically and provides an electrostatic discharging channel, and a base plate for improved heat dissipation through the quantum well layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the ultraviolet LED chip uses traditional structure with base plate and epitaxial structure, then the chip can achieve basic light emission function, but the heat dissipation performance is poor causing limited chip performance
Solution Approach 1:
The patent divides the epitaxial structure into two separate structures by introducing an insulating layer in the middle, which segments the heat dissipation paths and allows for improved thermal management. The groove contacting layer further segments the electrical contact regions, enabling independent optimization of heat dissipation and electrical connection pathways.
2Reliability
If the ultraviolet LED chip uses traditional structure, then the manufacturing process is relatively simple, but electrostatic discharging hazards occur affecting reliability
Solution Approach 1:
The insulating layer acts as an intermediary element that physically separates the epitaxial structure into two independent structures. This intermediary layer prevents electrostatic discharging hazards by isolating charge paths while maintaining the necessary electrical connections through the groove contacting layer, thus improving reliability without excessive complexity increase.
3Reliability
If the groove contacting layer penetrates the epitaxial structure to connect N-type AlGaN layer, then electrostatic discharging channel is provided improving reliability, but the device structure becomes more complex
Solution Approach 1:
The groove contacting layer serves multiple functions simultaneously: it provides electrostatic discharging protection by creating a dedicated discharge channel, maintains electrical connection to the N-type AlGaN layer, and acts as part of the insulating structure. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving improved reliability.
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 enhances heat dissipation, reduces electrostatic discharging hazards, increases forward voltage, and improves the light extraction coefficient and reliability of the ultraviolet LED chip.
Implementation Method 1
an ultraviolet LED chip comprises a substrate, an epitaxial structure growing on a surface of the substrate, an insulating layer arranged in the epitaxial structure
Implementation Method 2
the groove contacting layer penetrates a portion of the first epitaxial structure, is connected electrically to the N-type AlGaN layer in the first epitaxial structure, and is insulated from other structures in the first epitaxial structure
Data Source
AI summary
In an ultraviolet LED chip, an epitaxial structure can be isolated into two insulated structures, i.e. a first and a second epitaxial structures by growing the epitaxial structure on a surface of a substrate, and arranging an insulating layer and a groove contacting layer in the middle of the epitaxial structure. The N-type AlGaN layer is stretched out through the groove contacting layer. In the ultraviolet LED chip, through the cooperation among the N electrode, P electrode and intermediate electrode on the base plate along with the first and second epitaxial structures, an LED and an ESD are formed respectively. The ESD is connect to the ends of LED in anti-parallel for providing an electrostatic discharging channel, so as to reduce the direct damage of the ultraviolet LED chip caused by electrostatic discharging, and increase a forward voltage of the LED and the antistatic intensity.