Patterned Current Diffusion Layer for LED Efficiency
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Solution Overview
Problem
Conventional light-emitting diodes face challenges in current confinement and illumination efficiency due to the uniform thickness of current diffusion layers, leading to suboptimal light emission.
Innovation Solution
A light-emitting device with a current diffusion layer featuring an etched and unetched portion with a horizontal height difference of 20% to 70% of its thickness, allowing for lateral current diffusion and improved adhesion, which enhances illumination efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform thickness current diffusion layer is used, then the manufacturing process is simple, but current confinement is poor and illumination efficiency is low
Solution Approach 1:
The current diffusion layer is designed with non-uniform thickness, featuring a first region with greater thickness and a second region with lesser thickness. This local variation in thickness creates corresponding first and second regions with different current diffusion properties, enabling optimized current confinement in specific areas while maintaining overall manufacturing feasibility through a single layer structure.
2Productivity
If the current diffusion layer thickness is varied, then current distribution is improved, but the manufacturing complexity increases
Solution Approach 1:
The current diffusion layer is segmented into a first region and a second region with different thickness characteristics. The etched portion creates a height difference between these regions, forming a stepped structure that enables differentiated current diffusion control without requiring multiple separate layers, thus balancing functional complexity with manufacturing simplicity.
3Strength
If a single-layer current diffusion structure is used, then adhesion is sufficient, but current confinement capability is limited
Solution Approach 1:
The invention transitions from a single-plane (2D) current diffusion layer to a multi-level (3D) structure by creating etched portions that form height differences between the first and second regions. This vertical dimension addition enables enhanced current confinement through the stepped profile while preserving adhesion through the continuous material connection between regions.
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 solution effectively addresses current confinement issues and boosts illumination efficiency by enabling efficient current distribution across the active layer, resulting in improved light emission performance.
Implementation Method 1
the current diffusion layer has an etched portion and an unetched portion, and the etched and unetched portions have a horizontal height difference
Implementation Method 2
an adhesive layer on the permanent substrate; a current diffusion layer on the adhesive layer
Data Source
AI summary
Disclosed is a light-emitting device including a permanent substrate, an adhesive layer on the permanent substrate, a current diffusion layer on the adhesive layer, and a semiconductor stack layer on the current diffusion layer. The current diffusion layer has an etched portion and an unetched portion, wherein the etched and unetched portions have a horizontal height difference. The horizontal height difference and the current diffusion layer thickness have a ratio of 20:100 to 70:100.