Composite Phosphor Ceramic Optical Fiber for Yellow-Ring Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Laser lighting sources face challenges with low color rendering index due to narrow blue light spectrum and lack of red light components, and traditional phosphor powders have low luminous efficiency when used with high-power lasers, while existing phosphor ceramic solutions compromise efficiency for improved color rendering.
Innovation Solution
A composite phosphor ceramic optical fiber with a concentric double-layer structure, featuring a phosphor ceramic fiber core doped with Ce ions and a cladding doped with red phosphor ceramics, designed to match laser spot size, utilizing a gel-casting method for preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional phosphor powders are used with high-power lasers, then the structure is simple and easy to manufacture, but the luminous efficiency is low due to poor thermal conductivity
Solution Approach 1:
The patent uses composite phosphor ceramic materials combining multiple phosphor types (Y3Al5O12:Ce, Lu3Al5O12:Ce, and red phosphors) with different thermal and luminescent properties. This composite approach achieves high thermal conductivity for heat dissipation while maintaining high luminous efficiency, resolving the contradiction between ease of manufacture and luminous efficiency.
2Illumination intensity
If gadolinium ions, magnesium ions, or silicon ions are doped into garnet system to cause red shift, then the color rendering index is improved, but the luminous efficiency is reduced due to crystal structure alteration
Solution Approach 1:
The patent applies local quality by using different doping strategies in different phosphor components. The yellow phosphors use Ce ion doping for high efficiency, while red phosphors are separately doped with Mn or Cr ions for color rendering. This localized functional differentiation allows each component to optimize its performance without compromising the other.
Solution Approach 2:
The patent combines multiple phosphor materials (Y3Al5O12:Ce, Lu3Al5O12:Ce, and red phosphors) in a composite structure. This allows the system to achieve both high luminous efficiency from the Ce-doped yellow phosphors and good color rendering from the red phosphors, avoiding the trade-off present in single-phosphor systems with ion doping.
3Illumination intensity
If chromium or manganese ions are doped to increase red emission spectrum, then the color rendering index is improved, but the luminescence intensity of Ce ions decreases due to energy transfer
Solution Approach 1:
The patent segments the phosphor system into separate yellow phosphor components (Ce-doped) and red phosphor components (Mn or Cr doped). This segmentation prevents energy transfer between Ce and Mn/Cr ions that would occur in a single doped material, allowing each component to maintain its optimal luminescence intensity while contributing to the overall color rendering.
4Device complexity
If phosphor powders encapsulated in silicone are used as light emitting body, then the structure is simple, but the luminous efficiency is low due to opaque material and yellow ring effect
Solution Approach 1:
The patent uses composite phosphor ceramic materials with high thermal conductivity and transparent properties, replacing the silicone encapsulation approach. The ceramic composite structure enables both mechanical stability and optical transparency, eliminating the yellow ring effect while maintaining structural simplicity.
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 composite structure enhances luminous efficiency and color rendering index, addressing heat dissipation issues for stable long-term lighting and enabling mass production at low cost.
Implementation Method 1
combining blue laser diodes (LDs) with yellow phosphor materials to produce white light
Implementation Method 2
Based on a principle of total internal reflection of light, a distribution of blue laser around the transparent acrylic rod is very uniform
Implementation Method 3
utilizing a gel-casting method for preparation
Data Source
AI summary
A composite phosphor ceramic optical fiber with luminous efficiency and color rendering index includes a phosphor ceramic fiber core and a phosphor ceramic cladding, the phosphor ceramic fiber core uses a yellow phosphor ceramic doped with Ce ions, and the phosphor ceramic cladding uses a red phosphor ceramic co-doped with ions. The composite phosphor ceramic fiber is prepared by the gel casting. With this design structure, not only can the energy transfer between Ce ions and other ions cause a red shift in the spectrum to improve the color rendering index, but also the luminous efficiency can be significantly enhanced. In addition, a diameter of the composite phosphor ceramic optical fiber matches a laser spot size very well, effectively solving the “yellow ring effect” problem caused by the mismatch. It can effectively solve the heat dissipation problem during high power LD pumping and is conducive to long term stable lighting.