Semiconductor Light Emitting Device Insulating Layer Current Leakage
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Solution Overview
Problem
Current semiconductor light emitting devices face issues with current leakage and electrical reliability, particularly due to external moisture infiltration and electrical shorts at the outer portions of the light emitting structure.
Innovation Solution
An insulating layer is formed on the outer peripheral surface of the light emitting structure, acting as a sidewall and preventing residual materials and moisture from entering, while also enhancing the adhesion strength of the second electrode layer and reducing current leakage by directing applied current back into the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no insulating layer is provided on the outer peripheral surface, then the device structure remains simple, but current leakage and electrical shorts occur due to moisture infiltration
Solution Approach 1:
An insulating layer is formed on the outer peripheral surface of the light emitting structure, acting as a protective shell that prevents moisture and residual materials from infiltrating the electrode layers, thereby preventing current leakage and electrical shorts without significantly complicating the device structure
Solution Approach 2:
The insulating layer serves as an intermediary barrier between the external environment (moisture, contaminants) and the internal electrode layers, preventing harmful interactions and current leakage paths while maintaining the functional integrity of the device
2Reliability
If the insulating layer is formed only on the outer peripheral surface, then current leakage is prevented, but the adhesion strength of the electrode layer remains insufficient
Solution Approach 1:
The insulating layer performs multiple functions simultaneously: it provides electrical insulation to prevent current leakage along the outer peripheral surface, and it enhances the adhesion strength of the electrode layer to the semiconductor layers, making a single structural element serve dual purposes
3Object-affected harmful factors
If the insulating layer extends completely under the electrode layer, then moisture protection is maximized, but light emission is blocked
Solution Approach 1:
The insulating layer is strategically positioned only on the outer peripheral surface and outer peripheral portion of the electrode layer, providing moisture protection precisely where it is needed (at the edges where moisture infiltrates) while leaving the central light emitting region exposed and unobstructed
Data Source
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AI summary
Disclosed is a semiconductor light emitting device. The semiconductor light emitting device includes a first conductive semiconductor layer, an active layer under the first conductive semiconductor layer, a second conductive semiconductor layer under the active layer, a second electrode layer under the second conductive semiconductor layer; and an insulating layer on an outer peripheral surface of at least two layers of the first conductive semiconductor layer, the active layer, and the second conductive semiconductor layer.