Segmented Wavelength Conversion Component for Narrow Light Distribution
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Solution Overview
Problem
Light emitting devices with wavelength conversion components suffer from broad light distribution, leading to reduced utilization efficiency of emitted light, as a portion of excitation light is absorbed by phosphor-containing wavelength conversion members and not efficiently directed for emission.
Innovation Solution
A wavelength conversion component comprising semiconductor multilayer film segments, a first member arranged between adjacent segments, and a substrate with grooves, which includes transmission type optical elements to narrow light distribution by self-alignment and efficient light transmission, and a heat dissipation member to manage heat generated during wavelength conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a phosphor-containing wavelength conversion member is used to convert blue light to yellow light, then wavelength conversion is achieved, but the light distribution becomes broad which reduces utilization efficiency
Solution Approach 1:
The wavelength conversion member is divided into multiple segments arranged in a matrix pattern, with each segment containing semiconductor multilayer film segments. This segmentation allows for controlled light emission from discrete positions, enabling narrow light distribution while maintaining effective wavelength conversion across the entire component.
Solution Approach 2:
Each segment is designed with specific local properties including semiconductor multilayer films with particular emission characteristics. The first member material is selectively positioned between segments to control light transmission and reflection locally, creating regions with different optical functions that collectively achieve narrow overall light distribution.
2Use of energy by moving object
If excitation light is irradiated to a phosphor-containing wavelength conversion member, then wavelength conversion occurs, but heat is generated which decreases conversion efficiency
Solution Approach 1:
A heat dissipation member is introduced as an intermediary between the wavelength conversion member and the substrate. This heat dissipation member acts as a thermal conduit that efficiently transfers heat away from the wavelength conversion segments, preventing temperature buildup that would otherwise reduce conversion efficiency.
Solution Approach 2:
The heat generation problem is addressed by extracting thermal energy from the wavelength conversion member through the heat dissipation member. This separation of thermal management from the optical conversion function allows the wavelength conversion to proceed efficiently without thermal degradation.
3Productivity
If multiple wavelength conversion members are arranged to improve light utilization, then more light can be emitted, but device complexity increases
Solution Approach 1:
Multiple wavelength conversion members are merged into a single integrated wavelength conversion component with a unified substrate, first member, and heat dissipation member structure. This consolidation allows multiple segments to function together as one device, increasing light output while avoiding the complexity of assembling separate components.
Solution Approach 2:
The substrate serves multiple functions: providing mechanical support for the segments, facilitating heat dissipation through thermal conduction, and enabling optical transmission. The first member also performs dual functions of optical coupling and structural support, reducing the need for additional specialized components.
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 narrows the light distribution of emitted light, enhancing the utilization efficiency of the light emitting device by ensuring that light is emitted in a more focused manner and reducing heat-related wavelength conversion efficiency decreases.
Implementation Method 1
excitation light emitted from a blue light emitting diode or a blue semiconductor laser is irradiated to a phosphor-containing wavelength conversion member to cause wavelength-conversion to obtain yellow light
Implementation Method 2
a heat dissipation member to manage heat generated during wavelength conversion
Data Source
AI summary
A wavelength conversion component includes a plurality of semiconductor multilayer film segments, a first member arranged between adjacent ones of the semiconductor multilayer film segments, and a substrate disposed above the plurality of semiconductor multilayer film segments, the substrate defining a groove.