ZnO-Insulated Light Emitting Stack for Surface Defect Control
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Solution Overview
Problem
Existing light emitting elements face challenges in achieving improved lifetime and efficiency due to surface defects, which affect their performance and reliability in display devices.
Innovation Solution
A light emitting element is designed with a light emitting stack pattern comprising a first semiconductor layer, an active layer, and a second semiconductor layer, surrounded by an insulating film made of a zinc oxide (ZnO) thin film layer. This configuration includes doping with Group III transition metals and additional protective films to enhance surface protection and reduce defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light emitting element is used without an insulating film, then the device structure is simpler, but surface defects occur leading to reduced lifetime and efficiency
Solution Approach 1:
An insulating film is introduced as an intermediary layer between the light emitting stack and the external environment. This film acts as a mediator that protects the semiconductor layers from surface defects while maintaining electrical isolation, thereby improving lifetime without directly modifying the core light emitting structure
Solution Approach 2:
The insulating film is designed as a thin, sacrificial protective layer that can be easily formed and replaced during manufacturing. This disposable-like approach provides effective surface protection during operation while keeping the overall device structure simple and manufacturable
2Reliability
If an insulating film is added to protect the light emitting stack, then surface defects are controlled and efficiency improves, but the device structure becomes more complex
Solution Approach 1:
A thin film insulating layer is applied to cover the outer surface of the light emitting stack. This thin film approach provides comprehensive surface protection and defect control while adding minimal structural complexity and maintaining device compactness
Solution Approach 2:
The insulating film is formed using composite material systems that combine multiple functional properties in a single layer, providing both electrical insulation and surface defect protection simultaneously, thereby improving efficiency without proportionally increasing structural complexity
3Productivity
If densely packed arrays of light emitting elements are used, then productivity increases, but unwanted short circuits occur between adjacent elements
Solution Approach 1:
The insulating film serves as an intermediary barrier between adjacent light emitting elements in densely packed arrays. This intermediate layer prevents direct electrical contact between neighboring devices, eliminating short circuit risks while allowing maximum packing density for improved productivity
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
The proposed solution effectively controls surface defects, leading to improved light emission efficiency and extended lifetime of the light emitting elements, while also preventing unwanted short circuits in densely packed arrays.
Implementation Method 1
The insulating film includes a zinc oxide (ZnO) thin film layer... effectively controls surface defects
Implementation Method 2
The insulating film may be doped with at least one of Group III transition metals including yttrium (Y), scandium (Sc), lanthanum (La)
Implementation Method 3
preventing unwanted short circuits in densely packed arrays
Data Source
AI summary
A light emitting element includes: a light emitting stack pattern including a first semiconductor layer, an active layer, and a second semiconductor layer that are sequentially stacked along one direction; and an insulating film surrounding an outer surface of at least one of the first semiconductor layer, the active layer, and the second semiconductor layer. The insulating film including a zinc oxide (ZnO) thin film layer.