LED Structure with Inclined Reflective Layers for Current Spreading
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Solution Overview
Problem
Current light emitting diodes (LEDs) face challenges in achieving optimal light emitting efficiency due to limitations in current spreading and light extraction, which affect their brightness and performance in various applications.
Innovation Solution
The proposed solution involves a light emitting device structure with a conductive support substrate, multiple reflective layers, and a light emitting structure comprising semiconductor layers, where the reflective layers are designed to create ohmic and schottky contacts to improve current spreading and light reflection, thereby enhancing light emitting efficiency. The structure includes a first reflective layer on the conductive support substrate, a second reflective layer on the first layer, and a light emitting structure with inclined side surfaces to optimize light reflection and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional LED structure is used, then manufacturing is simple, but light emitting efficiency is insufficient due to poor current spreading and light extraction
Solution Approach 1:
The reflective layer is divided into multiple segments with different orientations (first reflective layer with first inclination, second reflective layer with second inclination). Each segment reflects light in a specific direction to improve overall light extraction efficiency while managing the complexity through modular design
Solution Approach 2:
The patent introduces inclined reflective layers that extend in different directional dimensions rather than using a single flat reflective surface. This multi-dimensional arrangement enhances light extraction by capturing and redirecting light from various angles, improving efficiency without significantly increasing manufacturing complexity
2Productivity
If current is concentrated in specific area, then electrode structure is simple, but light emitting efficiency decreases due to poor current spreading
Solution Approach 1:
The reflective layers are positioned to create localized current spreading pathways. The first and second reflective layers are arranged to guide current flow to specific regions where light emission is most effective, improving current distribution uniformity while maintaining a relatively simple electrode structure
Solution Approach 2:
The reflective layers serve as intermediary structures between the electrode and the light emitting structure. They mediate the current flow and light extraction process, distributing current more evenly across the active region while facilitating efficient light extraction, thus resolving the contradiction between simple electrode design and effective current spreading
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 prevents concentrated current flow, spreads current evenly across the light emitting structure, and improves light emitting efficiency by effectively reflecting light, resulting in enhanced performance and brightness for LEDs.
Implementation Method 1
the second reflective layer contacts the light emitting structure to realize schottky contact
Implementation Method 2
improves light emitting efficiency by effectively reflecting light
Data Source
AI summary
Provided are a light emitting device, a method for fabricating the light emitting device, a light emitting device package, and a lighting unit. The light emitting device includes a conductive support substrate, a first reflective layer on the conductive support substrate, a second reflective layer in which at least portion thereof is disposed on a side surface of the first reflective layer, a light emitting structure including a first conductive type semiconductor layer, a second conductive type semiconductor layer, and an active layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer on the first and second reflective layers, and an electrode on the light emitting structure. The second reflective layer schottky-contacts the light emitting structure.