LED Electrode Structure Optimizing Current Distribution
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Solution Overview
Problem
Current light-emitting devices, such as LEDs, face challenges in enhancing light emitting efficiency, which is crucial for their application in various fields including displays and lighting systems.
Innovation Solution
The design incorporates a semiconductor light-emitting stack with a specific electrode structure that includes a current injected portion, extension portions, and an electrical contact structure, where the ratio of the electrical contact structure to the light emitting area is between 3% to 15%, optimizing current injection and distribution for improved luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electrical contact structure area is increased to improve current distribution, then luminous efficiency improves, but the ratio of electrical contact structure to light emitting area becomes too large
Solution Approach 1:
The electrode structure is divided into different functional regions: a current injected portion with larger area for current input, extension portions for current distribution, and an electrical contact structure with optimized area ratio (3%-15%) for effective electrical contact. Each region has different area characteristics suited to its specific function, resolving the contradiction between sufficient current distribution and maintaining light emitting area.
2Device complexity
If the electrode structure is simplified to reduce manufacturing complexity, then device complexity decreases, but current injection and distribution efficiency deteriorates
Solution Approach 1:
The electrode is segmented into distinct functional portions: a current injected portion for current input, extension portions for current distribution across the semiconductor layer, and an electrical contact structure for electrical contact. This segmentation allows each portion to be optimized for its specific function while maintaining overall structural simplicity and manufacturability.
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
This configuration enhances the luminous efficiency of light-emitting devices, achieving efficiencies up to 80 lm/W, surpassing conventional designs, and allowing for better light extraction and distribution.
Implementation Method 1
a semiconductor light-emitting stack having a light emitting area
Implementation Method 2
an electrode formed on the semiconductor light-emitting stack, wherein the electrode comprises a current injected portion and an extension portion; a current blocking area formed between the current injected portion and the semiconductor light-emitting stack
Data Source
AI summary
A light-emitting device includes a semiconductor light-emitting stack; a current injected portion formed on the semiconductor light-emitting stack; an extension portion having a first branch radiating from the current injected portion and a second branch extending from the first branch; an electrical contact structure between the second branch and the semiconductor light-emitting stack and having a first width; and a current blocking structure located right beneath the electrical contact structure and having a second width larger than the first width.