Nanoparticle Potting Gradient for LED Light Extraction
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Solution Overview
Problem
Conventional radiation emitting devices face inefficiencies and poor decoupling of electromagnetic radiation due to significant refractive index jumps at the interface between highly refractive silicones and the surrounding medium.
Innovation Solution
The radiation emitting device incorporates a semiconductor chip with an epitaxially grown semiconductor layer sequence and a potting material comprising a matrix and nanoparticles, where the concentration of nanoparticles decreases from the radiation exit surface, reducing the refractive index and minimizing refractive index jumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If highly refractive silicone potting material is used, then the brightness of the semiconductor chip is improved, but significant refractive index jumps at the interface cause poor decoupling of electromagnetic radiation
Solution Approach 1:
The patent applies local quality by creating a gradient structure where the refractive index varies spatially within the potting material. The first region adjacent to the semiconductor chip has a higher refractive index to enhance brightness, while the second region farther away has a lower refractive index to reduce decoupling losses. This spatial variation in material property resolves the contradiction by optimizing both brightness and energy efficiency in different locations.
Solution Approach 2:
The patent implements parameter changes by systematically varying the refractive index parameter throughout the potting material. By using a gradient of refractive indices from the first region to the second region, the invention transforms the uniform material property into a spatially varying parameter, thereby achieving both high brightness enhancement and reduced electromagnetic radiation losses.
2Ease of manufacture
If uniform refractive index potting material is used, then manufacturing is simple, but decoupling of electromagnetic radiation is poor due to refractive index jumps
Solution Approach 1:
The patent resolves this contradiction by implementing local quality through a gradient structure. Instead of using a uniform material throughout, the invention creates distinct regions with different refractive index characteristics - a first region with higher refractive index near the chip and a second region with lower refractive index farther away. This approach maintains manufacturing feasibility while significantly improving decoupling performance.
Solution Approach 2:
The patent applies composite materials by combining multiple materials or material compositions with different refractive indices to form a gradient structure. The first region and second region are composed of different material formulations that create the desired refractive index gradient, enabling improved electromagnetic radiation decoupling while remaining manufacturable through conventional techniques.
3Illumination intensity
If high concentration of nanoparticles is used throughout, then refractive index is high for brightness, but losses at the interface increase
Solution Approach 1:
The patent applies local quality by spatially differentiating the nanoparticle concentration within the potting material. The first region adjacent to the semiconductor chip contains a higher concentration of nanoparticles to achieve high refractive index for brightness enhancement, while the second region contains a lower concentration to reduce interface losses. This localized optimization resolves the contradiction between brightness and energy efficiency.
Solution Approach 2:
The patent implements segmentation by dividing the potting material into distinct regions - a first region with high nanoparticle concentration and a second region with low nanoparticle concentration. This segmentation allows each region to be optimized for its specific function: the first region maximizes brightness while the second region minimizes decoupling losses, thereby resolving the contradiction.
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 efficiency and decoupling of electromagnetic radiation by reducing losses due to refractive index jumps, leading to improved brightness and efficiency of the radiation emitting device.
Implementation Method 1
the concentration of nanoparticles in the matrix material decreases starting from the radiation exit surface, so that a refractive index of the potting decreases starting from the radiation exit surface of the semiconductor chip
Data Source
AI summary
In an embodiment a radiation emitting device includes a semiconductor chip configured to emit electromagnetic radiation of a first wavelength range from a radiation exit surface and a potting comprising a matrix material and a plurality of nanoparticles, wherein a concentration of the nanoparticles in the matrix material decreases starting from the radiation exit surface of the semiconductor chip so that a refractive index of the potting decreases starting from the radiation exit surface of the semiconductor chip, and wherein the nanoparticles are coated with a shell.