Light Emitter With Wavelength Converter For Uniform Color
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Solution Overview
Problem
Existing light emitters face challenges in achieving uniform color emission due to the greater transmission loss of shorter peak wavelength light in optical fibers, leading to uneven color distribution.
Innovation Solution
The light emitter incorporates a light source unit that emits first excitation light and first mixed light, which enters an optical fiber with a wavelength converter. The wavelength converter emits fluorescence, mixing with the first mixed light to produce second mixed light, which is emitted through the side surface of the optical fiber, thereby compensating for the loss of shorter peak wavelength light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If shorter peak wavelength light is transmitted through optical fiber, then color diversity is improved, but transmission loss increases causing uneven color distribution
Solution Approach 1:
The patent converts the harmful transmission loss of short-wavelength light into a beneficial effect by using the excitation light to generate fluorescence in the wavelength converter. The fluorescence emission at longer wavelengths compensates for the transmitted short-wavelength light that is lost in the optical fiber, transforming the transmission loss problem into a color compensation solution.
Solution Approach 2:
The patent changes the wavelength parameter of light through fluorescence conversion. The wavelength converter transforms excitation light at one wavelength into emitted light at a different (longer) wavelength, allowing compensation for the transmission loss of short-wavelength light and achieving uniform color distribution despite fiber transmission characteristics.
2Stability of the object's composition
If wavelength converter is added to optical fiber, then color uniformity is improved, but device complexity increases
Solution Approach 1:
The optical fiber serves multiple functions: it transmits both the excitation light to the wavelength converter and the emitted fluorescence to the output. The wavelength converter simultaneously performs wavelength transformation and color compensation. This multi-functionality reduces the need for separate components and simplifies the overall device structure despite adding functionality.
Solution Approach 2:
The wavelength converter is integrated within the optical fiber structure, with the converter material positioned in the core or cladding region. This nested arrangement allows the wavelength conversion function to be incorporated without requiring separate external components, maintaining a compact and simple device architecture while achieving color uniformity.
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 solution ensures that the light emitted from the light-emitting member has a more uniform color, reducing the intensity difference between different wavelengths and minimizing the occurrence of uneven color emission.
Implementation Method 1
The wavelength converter emits fluorescence, mixing with the first mixed light to produce second mixed light
Data Source
AI summary
A light-emitting member includes an optical fiber that receives first excitation light and first mixed light. The optical fiber includes a first wavelength converter that emits first fluorescence in response to the first excitation light, and emits second mixed light being a mixture of the first mixed light and the first fluorescence through a side surface. The light-emitting member includes a light-emitting portion that emits the second mixed light outside the light-emitting member. A plurality of component light beams of the first mixed light includes first component light with a first peak wavelength and second component light with a second peak wavelength longer than the first peak wavelength. An absolute value of a difference between a first fluorescence peak wavelength of the first fluorescence and the first peak wavelength is less than an absolute value of a difference between the first fluorescence peak wavelength and the second peak wavelength.