Light-Emitting Device with Segmented Light-Guiding Member
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Solution Overview
Problem
Existing light-emitting devices with wavelength conversion members suffer from reduced light extraction efficiency due to optical losses, as light is scattered within the conversion member before emission.
Innovation Solution
A light-emitting device design incorporating a light-guiding member with a first light-guiding member bonded to the light-emitting element, a wavelength conversion member, and a second light-guiding member, where the light-emission surface is exposed through a reflective member, reducing optical loss by guiding light before it enters the wavelength conversion member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is transmitted through the wavelength conversion member to achieve wavelength conversion, then wavelength conversion is achieved, but light extraction efficiency decreases due to repeated scattering
Solution Approach 1:
The light-guiding member is divided into three distinct segments: a first light-guiding member for light input, a wavelength conversion member for wavelength transformation, and a second light-guiding member for light output. This segmentation allows each component to perform its specific function optimally, with the wavelength conversion member being spaced from the light-emitting element to reduce unnecessary light scattering while maintaining effective wavelength conversion.
2Productivity
If the wavelength conversion member is positioned adjacent to the light-emitting element to facilitate light conversion, then wavelength conversion efficiency is improved, but light scattering increases and reduces extraction efficiency
Solution Approach 1:
The first light-guiding member acts as an intermediary component between the light-emitting element and the wavelength conversion member. It transmits light from the light-emitting element to the wavelength conversion member in a controlled manner, enabling efficient wavelength conversion while minimizing direct contact and associated light scattering between the light-emitting element and the wavelength conversion member.
3Productivity
If the light-emission surface is fully covered by the light-guiding member to maximize light guidance, then light guidance efficiency is improved, but the emission surface area is reduced
Solution Approach 1:
The light-guiding member is configured to extend in multiple dimensions: the first light-guiding member receives light from the light-emitting element, the wavelength conversion member converts the wavelength, and the second light-guiding member directs the converted light to the light-emission surface. This multi-dimensional arrangement ensures comprehensive light guidance while maintaining an adequate light-emission surface area for effective light output.
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 enhances light extraction efficiency by minimizing light scattering within the wavelength conversion member, resulting in improved luminance and reduced optical loss.
Implementation Method 1
a wavelength conversion member disposed spaced from the light-emitting element and having a surface adjacent to the incident surface of the first light-guiding member and configured to convert light from the first light-guiding member into light having a different wavelength
Implementation Method 2
The light-reflective member covers the light-emitting element and the light-guiding member so that the light-emission surface is exposed from the light reflective member
Data Source
AI summary
A light-emitting device is provided. The light-emitting device includes a light-emitting element having a light-extracting surface, a light-guiding member, and a light-reflective member. The light-guiding member includes a first light-guiding member having an incident surface bonded to the light-extracting surface, a wavelength conversion member disposed spaced from the light-emitting element and having a surface adjacent to the incident surface of the first light-guiding member and configured to convert light from the first light-guiding member into light having a different wavelength, and a second light-guiding member adjacent to the wavelength conversion member and having a light-emission surface through which light from the wavelength conversion member is emitted to outside. The light-reflective member covers the light-emitting element and the light-guiding member so that the light-emission surface is exposed from the light reflective member.