Light Emitting Element with Reflective Member for Color Mixing
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Solution Overview
Problem
Conventional light emitting elements face challenges in achieving improved light emitting characteristics, such as uniform color mixing and efficiency, due to direct incidence of light on wavelength conversion members and limited reflectance properties of light reflecting members.
Innovation Solution
A light emitting element design featuring a light reflecting member with distinct regions and semiconductor layered bodies emitting different peak wavelengths, where the light reflecting member has higher reflectance than the wavelength conversion member, and the light from these bodies propagates through a base member to efficiently mix and convert light colors, with a wavelength conversion member producing third light of a different peak wavelength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light is directly incident on the wavelength conversion member, then the structure is simple, but the light mixing efficiency is poor and color uniformity deteriorates
Solution Approach 1:
The patent introduces a light reflecting member as an intermediary component between the light emitting part and the wavelength conversion member. This reflecting member redirects light that would otherwise directly hit the wavelength conversion member, causing it to travel through the base member first. This intermediary structure improves color mixing and uniformity without significantly complicating the overall device architecture.
2Productivity
If the light reflecting member has high reflectance, then light emission efficiency is improved, but direct incidence on wavelength conversion member increases
Solution Approach 1:
The patent applies local quality by creating different regional functions within the light reflecting member. The first region has high reflectance to improve light emission efficiency, while the second region (with opening) allows controlled direct incidence on the wavelength conversion member. This spatial differentiation of reflectance properties enables both high efficiency and good color mixing uniformity simultaneously.
3Adaptability or versatility
If multiple semiconductor layered bodies with different peak wavelengths are used, then color range is expanded, but device complexity increases
Solution Approach 1:
The patent merges multiple semiconductor layered bodies (first and second light emitting parts) into a single integrated structure mounted on a common base member. This consolidation approach expands the color range by incorporating multiple emission wavelengths while avoiding the complexity of separate devices. The unified structure with shared base member and integrated light reflecting member reduces overall system complexity compared to using separate light emitting devices.
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 emitting characteristics by ensuring efficient mixing of light colors, reducing direct incidence on the wavelength conversion member, and improving the light emission efficiency, resulting in a wide range of colors and improved light emitting performance.
Implementation Method 1
The light reflecting member has a reflectance to the first light higher than a reflectance of the wavelength conversion member to the first light. The light reflecting member has a reflectance to the second light is higher than a reflectance of the wavelength conversion member to the second light.
Implementation Method 2
a wavelength conversion member on which the first light and the second light is incident, the wavelength conversion member producing third light having a third peak wavelength different from the first peak wavelength and the second peak wavelength
Data Source
AI summary
A method of manufacturing a light emitting element includes: providing a first light emitting part and a second light emitting part, the first light emitting part comprising a first base member and a first semiconductor layered body, the second light emitting part comprising a second base member and a second semiconductor layered body; bonding the first and second light emitting parts to each other such that the first base member and the second base member are disposed between the first semiconductor layered body and the second semiconductor layered body; disposing a light reflecting member to cover the bonded first and second light emitting parts; removing a portion of the light reflecting member to expose surfaces of the first and second base members; and disposing a wavelength conversion member on the exposed surface of the first base member and the exposed surface of the second base member.