Dielectric Reflection Layer for LED Light Extraction
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Solution Overview
Problem
Existing light-emitting diode (LED) reflection layers made of metallic materials have inferior reflectivity, leading to energy loss and inter-diffusion issues, which limit improvements in light-emitting efficiency.
Innovation Solution
A reflection layer composed of multiple dielectric materials with varying types and thicknesses, eliminating metallic materials to enhance reflectivity and prevent inter-diffusion, applied to both vertical and flip-chip LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If metallic materials are used for the reflection layer, then the structure is simple and easy to manufacture, but the reflectivity is inferior and inter-diffusion occurs with other metal layers
Solution Approach 1:
The patent applies composite materials by constructing the reflection layer from multiple dielectric material layers (first dielectric layer, second dielectric layer, third dielectric layer) with different refractive indices and thicknesses. This multi-layer dielectric composite structure achieves high reflectivity across a broad spectrum range, replacing traditional single-material metallic reflection layers and eliminating inter-diffusion issues while maintaining manufacturing feasibility.
2Ease of manufacture
If metallic materials are used for the reflection layer, then the manufacturing process is simple, but the reflectivity is inferior causing light energy to be absorbed
Solution Approach 1:
The patent applies composite materials by constructing the reflection layer from multiple dielectric material layers (first dielectric layer, second dielectric layer, third dielectric layer) with different refractive indices and thicknesses. This multi-layer dielectric composite structure achieves high reflectivity across a broad spectrum range, replacing traditional single-material metallic reflection layers and eliminating inter-diffusion issues while maintaining manufacturing feasibility.
3Reliability
If a reflection layer with metallic material and dielectric material is used, then inter-diffusion phenomenon is improved, but the reflectivity is not enhanced
Solution Approach 1:
The patent applies composite materials by constructing the reflection layer from multiple dielectric material layers (first dielectric layer, second dielectric layer, third dielectric layer) with different refractive indices and thicknesses. This multi-layer dielectric composite structure achieves high reflectivity across a broad spectrum range, replacing traditional single-material metallic reflection layers and eliminating inter-diffusion issues while maintaining manufacturing feasibility.
Solution Approach 2:
The patent applies parameter changes by optimizing the thickness parameters of each dielectric layer (first dielectric layer thickness, second dielectric layer thickness, third dielectric layer thickness) to achieve constructive interference of reflected light waves. By carefully controlling these thickness parameters, the reflection layer achieves high reflectivity across a broad spectrum, transforming the optical response through parameter optimization.
4Loss of energy
If multiple dielectric materials with varying thicknesses are used, then reflectivity is enhanced and inter-diffusion is prevented, but the structure becomes more complex
Solution Approach 1:
The patent applies composite materials by constructing the reflection layer from multiple dielectric material layers (first dielectric layer, second dielectric layer, third dielectric layer) with different refractive indices and thicknesses. This multi-layer dielectric composite structure achieves high reflectivity across a broad spectrum range, replacing traditional single-material metallic reflection layers and eliminating inter-diffusion issues while maintaining manufacturing feasibility.
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 dielectric reflection layer achieves high reflectivity, reducing energy absorption and improving light-emitting efficiency across a wide spectrum, while preventing inter-diffusion with other metal layers.
Implementation Method 1
The plurality of dielectric materials has two or more types and has two or more thicknesses for producing a variety of combinations, and thus producing reflection layers with a variety of structures
Implementation Method 2
a reflection layer is set in the structure of LEDs for reflecting the light energy emitted by the LEDs
Data Source
AI summary
The present invention provides a light-emitting device with a reflection layer and the structure of the reflection layer. The reflection layer comprises a variety of dielectric materials. The reflection layer includes a plurality of dielectric layers. The materials of the plurality of dielectric layers have two or more types with two or more thicknesses, except for the combination of two material types and two thicknesses, for forming the reflection layer with a variety of structures. The reflection layer according to the present invention can be applied to light-emitting diodes of various types to form new light-emitting devices. Owing to its excellent reflectivity, the reflection layer can improve light-emitting efficiency of the light-emitting devices.