Wavelength Conversion Element With Reflective Layers
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Solution Overview
Problem
There is a need to increase the brightness of light sources using wavelength conversion members, as existing technologies have limitations in maximizing light intensity and rectilinear propagation.
Innovation Solution
A wavelength conversion element is designed with phosphor powder dispersed in a dispersion medium and multiple reflective layers made of metal or alloy, which are strategically positioned to reflect light back into the optical axis, reducing side surface emission and enhancing light intensity and rectilinear propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wavelength conversion member is used to convert light wavelength, then the light source can emit white light, but the brightness and light intensity are insufficient
Solution Approach 1:
The wavelength conversion member is divided into multiple sections by inserting reflective layers at specific positions, creating a segmented structure that allows independent optimization of light conversion in each section while preventing light loss through the sides
Solution Approach 2:
Light that would normally be lost through the side surfaces is converted into a beneficial resource by using reflective layers to redirect this scattered light back into the optical path, transforming what was previously waste light into useful contributing light
2Illumination intensity
If light is scattered toward side surfaces in the wavelength conversion member, then light conversion occurs, but light exits from side surfaces reducing intensity at the light exit surface
Solution Approach 1:
The wavelength conversion member is segmented into multiple sections by reflective layers positioned at specific intervals, creating discrete conversion zones that confine light within the optical path and prevent lateral escape
Solution Approach 2:
Reflective layers are introduced as intermediary elements between the light source and the wavelength conversion member, acting as mediators that intercept scattered light and redirect it back into the optical axis without interfering with the wavelength conversion process
3Stability of the object's composition
If a single wavelength conversion member is used, then the structure is simple, but rectilinear propagation of light is poor
Solution Approach 1:
The wavelength conversion member is divided into multiple sections by reflective layers, creating a segmented structure that maintains structural simplicity while improving light propagation characteristics through controlled light confinement in each section
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 effectively increases the brightness of the light source by improving light intensity and rectilinear propagation, achieving higher luminescence efficiency and thermal resistance through the use of inorganic phosphor powder and reflective layers within the wavelength conversion member.
Implementation Method 1
part of light scattered toward the side surfaces is reflected by the reflective layers
Implementation Method 2
a wavelength conversion member is disposed on a light exit side of an LED for emitting a blue light and absorbs part of the light from the LED to emit a yellow light
Data Source
AI summary
A light source using a wavelength conversion element is increased in brightness. A wavelength conversion element includes: a wavelength conversion member made of phosphor powder dispersed in a dispersion medium and having a light entrance surface and a light exit surface opposed to each other in a direction of optical axis; and at least two first reflective layers provided inside the wavelength conversion member along a plane parallel to the direction of optical axis and dividing the wavelength conversion member into a plurality of sections.