Light Emitting Element Electrode Structure for Short-Circuit Insulation
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Solution Overview
Problem
Existing light emitting elements are prone to short circuit defects due to insufficient insulation around the electrode layer, leading to electrical instability and reduced efficiency.
Innovation Solution
A light emitting element design featuring a semiconductor layer, emission layer, and electrode layer with an insulating film surrounding the side surfaces, including a sloped electrode layer surface and a thickness that increases approaching the emission layer, ensuring complete coverage and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating film thickness is increased to prevent short circuits, then electrical stability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The insulating film is configured with varying thickness at different locations: a first thickness at the side surface of the electrode layer and a second thickness (greater than the first) at the side surface of the second semiconductor layer. This local differentiation provides enhanced insulation where needed (near the semiconductor layer) while maintaining adequate insulation elsewhere, preventing short circuits without requiring uniform thickness increase throughout, thus balancing reliability improvement with manufacturing feasibility.
2Reliability
If the insulating film completely surrounds the electrode layer for maximum protection, then short circuit prevention is improved, but manufacturing precision requirements increase
Solution Approach 1:
The insulating film is configured with varying thickness at different locations: a first thickness at the side surface of the electrode layer and a second thickness (greater than the first) at the side surface of the second semiconductor layer. This local differentiation provides enhanced insulation where needed (near the semiconductor layer) while maintaining adequate insulation elsewhere, preventing short circuits without requiring uniform thickness increase throughout, thus balancing reliability improvement with manufacturing feasibility.
3Reliability
If the electrode layer slope is increased to improve insulating film coverage, then insulation effectiveness is improved, but manufacturing difficulty increases
Solution Approach 1:
The electrode layer is configured with a specific slope angle (α) ranging from 45° to 60° relative to the substrate. This parameter optimization ensures that the insulating film can effectively cover the side surfaces of the electrode layer and second semiconductor layer, preventing short circuits. The slope angle is carefully selected to balance insulation effectiveness with manufacturability, as angles that are too steep would be difficult to fabricate while angles that are too shallow would compromise insulation coverage.
Data Source
AI summary
A light emitting element includes a first semiconductor layer; an emission layer disposed on the first semiconductor layer; a second semiconductor layer disposed on the emission layer; an electrode layer disposed on the second semiconductor layer; and an insulating film surrounding side surfaces of the first semiconductor layer, the emission layer, and the second semiconductor layer and surrounding a portion of the electrode layer at an end portion of the light emitting element on which the electrode layer is disposed. The electrode layer includes a first surface adjacent to the second semiconductor layer; a second surface facing the first surface and having a width less than a width of the first surface; and a side surface that connects the first surface and the second surface and has a slope in a range of about 75° to about 90° with respect to the first surface of the electrode layer.