Wavelength Conversion Member Reflecting Surface for Light Confinement
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Solution Overview
Problem
Existing wavelength conversion members in lighting fixtures face challenges in improving light confinement on surfaces other than the light incidence and emission faces, leading to reduced efficiency in wavelength conversion and increased light leakage.
Innovation Solution
A method of manufacturing a wavelength conversion member involving a sintered body with inorganic particles and phosphor particles, where acid treatment creates recessed portions on the light reflecting face, enhancing light confinement by reducing phosphor particle exposure and creating pores, and optionally incorporating a reflecting member to further improve reflectance and reduce light bleeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a sintered body is used as a wavelength conversion member, then wavelength conversion efficiency is improved, but light confinement on surfaces other than incidence and emission faces deteriorates
Solution Approach 1:
The patent applies porous materials by forming recessed portions on the light reflecting face of the sintered body through acid treatment. These recessed portions create a porous surface structure that enhances light confinement by increasing the path length of light within the wavelength conversion member, thereby reducing light leakage from lateral surfaces while maintaining wavelength conversion efficiency.
Solution Approach 2:
The patent applies local quality by creating recessed portions specifically on the light reflecting face (lateral surfaces) while leaving the light incidence face and light emission face relatively smooth. This localized modification targets the specific problem of light leakage from lateral surfaces without affecting the optical performance of the incidence and emission faces.
2Object-generated harmful factors
If surface(s) other than light incidence face and light emission face are covered with reflecting member, then light confinement is improved, but device complexity increases
Solution Approach 1:
The patent merges the reflecting member with the sintered body by forming recessed portions directly on the sintered body's light reflecting face. This integration eliminates the need for separate reflecting member components, reducing assembly steps and structural complexity while maintaining light confinement functionality.
Solution Approach 2:
The recessed portions created through acid treatment provide an intrinsic light-trapping structure that functions as a built-in reflecting mechanism, replacing the need for external reflecting members and simplifying the overall device structure.
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 method effectively enhances light confinement on the reflecting face, reducing light leakage and improving the luminance difference between the emission face and the surrounding area, resulting in more efficient wavelength conversion and a clearly distinguishable light-dark boundary.
Implementation Method 1
forming a plurality of recessed portions on the light reflecting face of the sintered body, which comprises acid treating the sintered body
Implementation Method 2
a wavelength conversion member to convert the wavelength of the blue light emitted by a light emitting diode
Data Source
AI summary
A wavelength conversion member includes: a sintered body that has a light incidence face, a light emission face, and a light reflecting face that is different from the light incidence face and the light emission face, wherein the sintered body contains phosphor particles. The light reflecting face of the sintered body has a plurality of recessed portions. A distribution of the phosphor particles at the light reflecting face is lower than a distribution of the phosphor particles at a cross-section inside the sintered body.