LED Scattering Pattern Structure for Higher Light Extraction
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Solution Overview
Problem
Semiconductor-based light emitting diodes (LEDs) face challenges in achieving high light extraction efficiency due to total reflection phenomena caused by high refractive index materials, leading to trapped light and reduced luminous efficiency.
Innovation Solution
A light emitting device is designed with a buffer layer, a body comprising semiconductor layers, a reflective layer, and a scattering pattern between the first semiconductor layer and the buffer layer. The scattering pattern, which can have a mesh structure with holes of various shapes, is configured to scatter light emitted from the active layer and reflected light, enhancing light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high refractive index materials are used in LED, then luminous efficiency is improved, but light extraction efficiency deteriorates due to total reflection phenomenon
Solution Approach 1:
The patent introduces a scattering pattern with a mesh structure including a plurality of holes between the first semiconductor layer and the buffer layer. This porous structure creates refractive index variations that scatter trapped light, enabling it to escape the LED and improving light extraction efficiency without compromising the high refractive index materials needed for luminous efficiency.
Solution Approach 2:
The patent changes the physical and optical parameters by introducing a scattering pattern with specific structural characteristics (mesh structure with holes of various shapes, period of 0.1-10 μm, thickness of 10 nm-1 μm). This scattering pattern creates refractive index variations that transform the optical path of trapped light, enabling it to escape and improving light extraction efficiency while maintaining the high refractive index materials for luminous efficiency.
2Loss of energy
If scattering pattern is introduced to improve light extraction, then light extraction efficiency is improved, but device complexity increases
Solution Approach 1:
The patent introduces a scattering pattern with a mesh structure including a plurality of holes, creating a three-dimensional optical path modification within the existing LED structure. This dimensional approach scatters light in multiple directions, improving light extraction efficiency without fundamentally redesigning the entire device architecture.
Solution Approach 2:
The scattering pattern employs a porous mesh structure with holes of various shapes (circular, elliptical, or polygonal cross-sections) that can be integrated into the existing LED layers. This porous design adds optical scattering functionality while maintaining compatibility with standard LED manufacturing processes, thereby limiting the increase in device complexity.
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 incorporation of a scattering pattern significantly improves light extraction efficiency by scattering light that would otherwise be trapped, resulting in enhanced luminous output and efficiency of the light emitting device.
Implementation Method 1
a scattering pattern provided between the first semiconductor layer and the buffer layer, the scattering pattern being configured to scatter the light incident from the active layer and light incident from the reflective layer
Implementation Method 2
a reflective layer configured to reflect light incident from the active layer
Data Source
AI summary
Provided is a light emitting device including a buffer layer, a body provided on the buffer layer, the body including a first semiconductor layer, an active layer, and a second semiconductor layer, a reflective layer configured to reflect light incident from the active layer, and a scattering pattern provided between the first semiconductor layer and the buffer layer, the scattering pattern being configured to scatter the light incident from the active layer and light incident from the reflective layer.