Semiconductor Light Emitting Element Alternating Conductive Insulating Substrate
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Solution Overview
Problem
Current semiconductor light emitting elements face challenges in maximizing light extraction efficiency due to total reflection at the emitting surface, which reduces luminous efficiency and increases current density.
Innovation Solution
The design incorporates a support substrate with alternating conductive and insulating portions, a stacked body with a nitride semiconductor structure, and electrodes that are electrically connected to these portions, minimizing the need for an electrode pad on the semiconductor layer and promoting light extraction through optimized surface irregularities and reflective layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrode pad is provided on the light emitting surface, then electrical connection is improved, but light extraction efficiency deteriorates due to blocking of light
Solution Approach 1:
The substrate surface is segmented into alternating conductive portions and insulating portions. The conductive portions provide electrical connection while the insulating portions allow light extraction, thus resolving the contradiction between electrical connection and light extraction efficiency.
Solution Approach 2:
Different regions of the substrate surface are given different properties: conductive portions for electrical connection and insulating portions for light extraction. This local differentiation allows both functions to coexist without interfering with each other.
2Loss of energy
If the light emitting area is increased, then luminous efficiency is improved, but current density increases which causes overheating
Solution Approach 1:
The current path is segmented through the alternating conductive and insulating portions, distributing current flow across multiple pathways. This reduces current density while maintaining large light emitting area, preventing overheating while improving luminous efficiency.
3Loss of energy
If total reflection at the emitting surface is reduced, then light extraction efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
Instead of complex surface treatments, the patent uses simple alternating conductive and insulating portions on the substrate surface. This segmented approach reduces total reflection and improves light extraction efficiency while maintaining simple manufacturing processes.
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 enhances light extraction efficiency while minimizing the reduction in light emitting area and current density, resulting in improved luminous efficiency and productivity during manufacturing.
Implementation Method 1
The conductive layer is provided between the second semiconductor layer and the first substrate. The conductive layer is electrically connected to at least one of the conductive portions and the second semiconductor layer.
Data Source
AI summary
A semiconductor light emitting element includes a first substrate, a stacked body, an electrode, and a conductive layer. The first substrate has a first face and a first side face. The first side face intersects the first face. The first substrate includes a plurality of conductive portions and a plurality of insulating portions arranged alternately. The stacked body is aligned with the first substrate. The stacked body includes first and second semiconductor layers and a light emitting layer. The electrode is electrically connected to the first semiconductor layer. The conductive layer is electrically connected to at least one of the conductive portions and the second semiconductor layer. At least one of the insulating portions is disposed between the first side face and a portion of the conductive layer nearest to the first side face.