Wavelength Conversion Element Protruding Structure Light Extraction
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Solution Overview
Problem
Existing wavelength conversion elements face challenges in efficiently extracting fluorescence due to the use of wavelength conversion layers with minimal scattering elements, leading to decreased fluorescence utilization efficiency and increased light loss.
Innovation Solution
A wavelength conversion element with a wavelength conversion layer having a scattering element content no higher than 5% in volume ratio, featuring protruding parts with a height of no less than 1 μm and a pitch of no less than 3 μm, which are designed to enhance the emission of fluorescence by optimizing the refractive index ratio and structure for efficient light extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the wavelength conversion layer includes little scattering elements to decrease light loss, then the wavelength conversion efficiency is improved, but the fluorescence extraction efficiency deteriorates
Solution Approach 1:
The invention segments the wavelength conversion layer into multiple regions with different scattering element concentrations. The first region (closer to the incident surface) has lower scattering element concentration to reduce light loss, while the second region (deeper in the layer) has higher scattering element concentration to enhance fluorescence extraction. This spatial segmentation allows each region to optimize for its specific function, resolving the contradiction between light loss reduction and fluorescence extraction efficiency.
2Productivity
If scattering elements are added to the wavelength conversion layer to improve fluorescence extraction, then the fluorescence use efficiency is improved, but the light loss increases
Solution Approach 1:
The invention applies local quality by creating non-uniform distribution of scattering elements within the wavelength conversion layer. Different regions have different scattering element concentrations tailored to their specific functional requirements. The first region has lower concentration for minimal light loss, while the second region has higher concentration for maximal fluorescence extraction. This local differentiation of material properties resolves the contradiction by optimizing each region's characteristics for its specific purpose.
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 significantly improves the use efficiency of fluorescence, suppresses light loss, and increases the thermal conductivity of the wavelength conversion layer, resulting in a high-efficiency wavelength conversion element for light source devices and projectors.
Implementation Method 1
a wavelength conversion layer which has a first surface and a second surface different from the first surface, and which includes a scattering element no higher than 5% in volume ratio, and which is configured to convert light in a first wavelength band into light in a second wavelength band different from the first wavelength band
Implementation Method 2
A wavelength conversion element with a wavelength conversion layer having a scattering element content no higher than 5% in volume ratio, featuring protruding parts with a height of no less than 1 μm and a pitch of no less than 3 μm, which are designed to enhance the emission of fluorescence by optimizing the refractive index ratio and structure for efficient light extraction
Data Source
AI summary
The wavelength conversion element according to the present disclosure includes a wavelength conversion layer which has a first surface and a second surface different from the first surface, and which includes a scattering element no higher than 5% in volume ratio, and which is configured to convert light in a first wavelength band into light in a second wavelength band different from the first wavelength band, and a plurality of protruding parts which is disposed so as to be opposed to the first surface, and which includes a first protruding part and a second protruding part adjacent to each other. A height of the plurality of protruding parts is no smaller than 1 μm, and a distance between a vertex of the first protruding part and a vertex of the second protruding part in a direction along the first surface is no smaller than 3 μm.