Resonant Cavity Structure for Higher Wavelength Conversion Efficiency
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Solution Overview
Problem
Current optical structures for wavelength conversion materials, such as phosphors, face limitations in enhancing color conversion efficiency, which is crucial for applications like lighting and displays.
Innovation Solution
A resonant cavity structure is designed with alternately stacked dielectric layers of different refractive indices, forming a cavity that traps excitation light of a specific wavelength, allowing for increased absorption and emission of a different wavelength by the wavelength conversion material, thereby improving color conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional optical structures are used with wavelength conversion materials, then the structure is simple, but color conversion efficiency is limited
Solution Approach 1:
The optical structure is segmented into multiple functional layers including a substrate layer, wavelength conversion material layer, and multiple dielectric layers with different refractive indices. This segmentation allows each layer to perform its specific function optimally while maintaining overall structural simplicity for manufacturing
Solution Approach 2:
The patent employs composite material structures by combining wavelength conversion materials (such as phosphors) with alternating dielectric layers of different refractive indices. This composite structure creates optical resonance effects that enhance color conversion efficiency without significantly complicating the manufacturing process
2Productivity
If resonance is achieved in the cavity at the first wavelength, then absorption efficiency increases, but the structure becomes more complex
Solution Approach 1:
The patent optimizes specific parameters of the dielectric layers including their thicknesses and refractive indices to achieve resonance at the excitation wavelength. By carefully controlling these parameters, the structure achieves enhanced absorption efficiency while maintaining a relatively simple layered configuration that can be fabricated using standard thin-film deposition techniques
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 resonant cavity structure enhances the absorption and emission efficiency of wavelength conversion materials, leading to improved color conversion efficiency and simplified fabrication for mass production in devices like LEDs.
Implementation Method 1
a cavity which includes a wavelength conversion material that absorbs light having a first wavelength and emits light having a second wavelength different from the first wavelength
Implementation Method 2
the resonant cavity structure is designed so that resonance occurs in the cavity at the first wavelength
Data Source
AI summary
A resonant cavity structure includes an upper layer in which first dielectric layers and second dielectric layers having different refractive indices are alternately stacked, a lower layer in which the first dielectric layers and the second dielectric layers are alternately stacked, and a cavity formed between the upper layer and the lower layer, wherein the cavity includes a wavelength conversion material that absorbs light having a first wavelength and emits light having a second wavelength different from the first wavelength, the resonant cavity structure is designed so that resonance occurs in the cavity at the first wavelength, and is provided so that an excitation light of the first wavelength is incident from below the lower layer.