LED Electrode Blocking Layer Structure Against Metal Migration
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Solution Overview
Problem
Conventional light-emitting diodes suffer from metal migration issues due to the lack of compactness and adhesion of silicon dioxide insulation layers, leading to moisture intrusion and potential short circuits, which conventional adhesive layers like titanium fail to completely prevent.
Innovation Solution
A light-emitting device with a laminated structure, including a blocking layer structure interposed between the electrode and insulation layers, featuring a first section on the electrode side wall and a second section between the insulation and laminated structure, made from materials like aluminum oxide to prevent metal migration and enhance adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a silicon dioxide insulation layer is used, then insulation performance is achieved, but adhesion to metal electrode deteriorates and moisture intrusion occurs
Solution Approach 1:
An aluminum oxide blocking layer is introduced as an intermediary between the silicon dioxide insulation layer and the metal electrode. This blocking layer serves as a mediator that provides both adhesion enhancement and moisture barrier functions, resolving the contradiction between insulation performance and adhesion/moisture protection
Solution Approach 2:
The patent employs a composite structure combining silicon dioxide insulation layer with aluminum oxide blocking layer. This composite material approach leverages the complementary properties of both materials: silicon dioxide for insulation and aluminum oxide for adhesion and moisture blocking, thereby resolving the technical contradiction
2Reliability
If no blocking layer is used, then device structure is simple, but metal migration occurs causing current leakage and short circuit
Solution Approach 1:
The aluminum oxide blocking layer acts as a protective intermediary between the metal electrode and the surrounding environment. This single intermediate layer prevents metal migration without requiring multiple complex protective structures, thus improving reliability while maintaining relatively simple device complexity
Solution Approach 2:
The blocking layer is implemented as a thin film structure that provides comprehensive protection against metal migration. This thin film approach prevents metal migration effectively while adding minimal structural complexity to the device
3Strength
If a thin titanium adhesive layer is used, then adhesion between insulation layer and metal electrode is enhanced, but side wall protection from moisture is insufficient
Solution Approach 1:
The patent replaces the thin titanium adhesive layer with a composite structure of silicon dioxide insulation layer plus aluminum oxide blocking layer. This composite material system provides both adhesion enhancement and comprehensive moisture protection, including side wall protection, thereby resolving the limitation of the thin titanium layer
Data Source
AI summary
A light-emitting device includes a light-emitting laminated structure, an electrode structure that is disposed on the light-emitting laminated structure, an insulation layer that is disposed on the light-emitting laminated structure, and a blocking layer structure that is interposed between the electrode structure and the insulation layer. The light-emitting laminated structure includes a first type semiconductor layer, a second type semiconductor layer, and an active layer that is interposed between the first type semiconductor layer and the second type semiconductor layer and is configured to emit light. The blocking layer structure has a first section and a second section that forms a continuous structure with the first section. The first section is interposed between a side wall of the electrode structure and the insulation layer, and the second section is interposed between the insulation layer and the light-emitting laminated structure.