Fluorescence Material Geometric Etching Layer Light Extraction
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Solution Overview
Problem
Current white light LED technologies face inefficiencies in light extraction due to a lack of standardization in packaging fluorescence powders, with research focusing more on device structures and less on the particle design of fluorescence materials, which affects light extraction efficiency.
Innovation Solution
A fluorescence material with a particle diameter range of 150 nm to 10 nm and a long-to-short axis ratio of 3 to 1, featuring a geometrical etching layer and coated with a medium having refractive indices that match or exceed the material and encapsulation, to enhance light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional fluorescence powder packaging methods are used, then the device structure can be simplified, but the light extraction efficiency is insufficient
Solution Approach 1:
The patent applies local quality by modifying only the surface structure of the fluorescence powder particles (creating geometric etching layers) while keeping the bulk material and overall device structure simple. This localized modification at the particle surface level enables improved light extraction without complicating the entire packaging process.
Solution Approach 2:
The patent changes the particle diameter parameter to a specific range (150 nm to 10 nm) and introduces geometric etching layer parameters (shape, size, distribution) to optimize light extraction efficiency. These parameter modifications enable better optical performance while maintaining conventional packaging methods.
2Reliability
If research focuses on device structure design, then the overall device performance can be improved, but the fluorescence powder particle optimization is neglected
Solution Approach 1:
The patent segments the optimization focus from the overall device structure to the specific fluorescence powder particle level. By dividing the system into particle-level components (core material, etching layer, surface geometry), it enables precise control of particle structure independent of device structure design.
Solution Approach 2:
The patent shifts the optimization dimension from macro-level device structure to micro-level particle morphology. By working at the particle dimension (nanometer to micrometer scale) and introducing geometric etching features, it achieves precision control that was previously unavailable in conventional fluorescence powder applications.
3Ease of manufacture
If the fluorescence powder particle size is not controlled, then the manufacturing process is simpler, but the light extraction efficiency varies
Solution Approach 1:
The patent establishes specific parameter ranges for particle diameter (150 nm to 10 nm) and introduces geometric etching layer parameters to control light extraction efficiency. These standardized parameters enable consistent optical performance while maintaining manufacturing feasibility through conventional 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
The described fluorescence material structure improves light extraction efficiency in LED devices by reducing total reflection and optimizing light emission, maintaining consistent intensity across varying particle diameters.
Implementation Method 1
yttrium aluminum garnet (YAG) fluorescence powder, which can be excited by the blue light LED chip
Implementation Method 2
the refractive index of said fluorescence material is larger than or equal to the refractive index of the coating medium, and the refractive index of the coating medium is larger than or equal to the refractive index of the encapsulation
Data Source
AI summary
The present invention fluorescence material has a particle diameter of the crystal area defined as dc, and the scope of dc is: 150 nm≧dc≧10 nm. The coat of the outside of the fluorescence material has one sheet of coating medium at least. Of course, there is at least a geometrical etching layer on the particle of the fluorescence material. The above-described structures will promote the extraction efficiency of light.