LED Insertion Element for Light Extraction
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Solution Overview
Problem
Conventional light emitting diodes (LEDs) face challenges in achieving higher brightness, which is essential for various applications, including daily electric lamps and distress signals, due to limitations in luminous efficacy.
Innovation Solution
The integration of a reflective or refractive insertion element between the finger electrode and the second conductive semiconductor layer in the light emitting device, which is made of materials like Ag, Ni, or IZO, and extends to overlap with the pad electrode, enhances light emission by preventing absorption and redirecting light emitted by the active layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional LED structure is used, then the device is simple and easy to manufacture, but the luminous efficacy is limited and brightness is insufficient
Solution Approach 1:
The electrode is divided into multiple segments: pad electrode, finger electrode, and insertion element, each performing specific functions. The insertion element is further segmented into multiple layers with different materials and optical properties to optimize light extraction while maintaining electrical functionality.
Solution Approach 2:
The insertion element extends in the vertical direction overlapping with both the pad electrode and finger electrode, creating a three-dimensional structure that simultaneously achieves electrical connection and optical extraction enhancement without increasing lateral footprint.
2Loss of energy
If the electrode structure is extended to improve light extraction, then luminous efficacy improves, but the device structure becomes more complex
Solution Approach 1:
The insertion element acts as an intermediary component between the pad electrode and finger electrode. It serves dual functions: electrically connecting the electrode segments while simultaneously acting as an optical extraction element to reduce light absorption losses in the electrode.
Solution Approach 2:
The insertion element performs multiple functions simultaneously: it provides electrical connection between electrode segments, acts as an optical extraction element to improve light outcoupling, and maintains structural integrity of the device.
3Illumination intensity
If materials with high reflectivity are used in the insertion element, then light extraction is improved, but manufacturing precision requirements increase
Solution Approach 1:
The insertion element is constructed as a composite structure with multiple layers having different optical and electrical properties. This composite approach allows optimization of light extraction through material selection while the layered structure provides tolerance to manufacturing variations.
Solution Approach 2:
The optical and electrical parameters of the insertion element are optimized by selecting appropriate materials and thicknesses for each layer. By adjusting these parameters, high light extraction efficiency is achieved while maintaining compatibility with standard manufacturing processes.
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 significantly improves the luminous efficacy of the LED by reducing light absorption and increasing the brightness, making it suitable for higher brightness applications.
Implementation Method 1
The insertion element is configured to reflect light emitted by the active layer
Implementation Method 2
The insertion element is configured to refract light emitted by the active layer
Data Source
AI summary
Disclosed is a light emitting device, including: a substrate, a light emitting structure provided on the substrate, which includes a first conductive semiconductor layer, an active layer and a second conductive semiconductor layer laminated in sequential order, a transmissive electrode layer arranged on the light emitting structure, an electrode provided on the light emitting structure. Here, the electrode includes a pad electrode and a finger electrode, and an insertion element is placed between the finger electrode and the second conductive semiconductor layer, wherein the insertion element is formed such that at least one region thereof overlaps with the finger electrode in a vertical direction. Since the insertion element is formed under the finger electrode, it is possible to prevent light emitted by the active layer from being absorbed by the finger electrode. Accordingly, luminous efficacy of the light emitting device may be further enhanced.