Wavelength Conversion Film Phosphor Layer Stacking for Light Extraction
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Solution Overview
Problem
Light emitting device packages face challenges in achieving high light extraction and light conversion efficiency due to degradation in wavelength conversion processes.
Innovation Solution
A light emitting device package incorporating a wavelength conversion film with multiple phosphor layers and a transparent resin, where phosphor structures are formed using 3D printing to enhance light extraction and conversion efficiency, and the binding resin is cured to create a stable structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wavelength conversion is performed using conventional methods, then light emission is achieved, but light extraction efficiency and light conversion efficiency are degraded
Solution Approach 1:
The wavelength conversion film is divided into multiple phosphor layers with different phosphor materials, each layer converting light to different wavelengths. This segmentation allows optimized light extraction at each layer while maintaining high conversion efficiency, resolving the contradiction between extraction efficiency and conversion efficiency
Solution Approach 2:
The patent transitions from conventional single-layer or mixed phosphor structures to a multi-layer stacked configuration. This dimensional reorganization enables controlled light interaction at different depths, improving both extraction efficiency through layered architecture and conversion efficiency through material optimization in each layer
2Reliability
If multiple phosphor layers are stacked to improve light extraction efficiency, then light conversion efficiency is enhanced, but device complexity increases
Solution Approach 1:
Multiple phosphor layers are merged into a single integrated wavelength conversion film structure, where each layer contains specific phosphor materials combined with binding resin and transparent resin. This merging approach maintains high light extraction efficiency while managing complexity through unified film architecture
Solution Approach 2:
The patent optimizes parameters such as phosphor material composition, layer thickness, and resin ratios in each phosphor layer to achieve high light extraction efficiency. By carefully controlling these parameters, the system maintains simplicity while achieving the desired performance enhancement
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 solution significantly improves light extraction and conversion efficiency by optimizing the arrangement and structure of phosphor layers within the wavelength conversion film, leading to enhanced performance and reliability of the light emitting device package.
Implementation Method 1
a wavelength conversion material receiving light emitted from the light emitting device and converting a wavelength thereof
Implementation Method 2
a binding resin binding the wavelength conversion material
Implementation Method 3
a transparent resin filling spaces between the plurality of phosphor structures
Data Source
AI summary
A light emitting device package is provided. The package includes a light emitting device including a substrate, and a light emitting structure having a first conductivity-type semiconductor layer, an active layer, and a second conductivity-type semiconductor layer stacked on the substrate; and a wavelength conversion film disposed in a path of light emitted by the light emitting device and having phosphor layers stacked on each other. A portion of the phosphor layers includes phosphor structures including a wavelength conversion material receiving light emitted from the light emitting device and converting a wavelength thereof and a binding resin binding the wavelength conversion material, and a transparent resin filling spaces between the phosphor structures.