Neodymium Doped Polymer for LED Color Filtering
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Solution Overview
Problem
LED-based lighting systems, particularly those using a combination of blue LEDs and phosphors to produce white light, face challenges in achieving ideal whiteness and color saturation index (CSI) due to suboptimal light filtering.
Innovation Solution
A composite material comprising a polymeric matrix with neodymium compound particles, which filters yellow light and improves the colorimetric properties of LED light by adjusting doping concentration and thickness, is used in conjunction with a white LED package and optical components to enhance light filtering effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a combination of blue LED and phosphor is used to generate white light, then the LED system achieves high energy efficiency and long life expectancy, but the whiteness and color saturation index (CSI) of the light are not ideal
Solution Approach 1:
The patent introduces an optical component containing neodymium compound particles as an intermediary element between the blue LED-phosphor light source and the final illumination. This intermediary selectively filters yellow light wavelengths, transforming the suboptimal white light into light with improved whiteness and color saturation without requiring changes to the efficient LED light source itself.
Solution Approach 2:
The patent modifies the optical parameters of the light by introducing neodymium compound particles with specific optical absorption characteristics. By controlling the concentration (0.4% to 8% by weight) and optical properties of these particles, the system changes the spectral distribution of the light to improve whiteness and color saturation while preserving the energy efficiency of the original LED source.
2Illumination intensity
If neodymium compound particles are added to filter yellow light, then the Color Rendering Index (CRI) and Color Saturation Index (CSI) improve, but the device complexity increases
Solution Approach 1:
The patent employs a composite material system where neodymium compound particles are dispersed within a polymeric matrix to form an integrated optical component. This composite structure combines the light-filtering functionality of neodymium compounds with the structural and optical properties of the polymer matrix, achieving improved color rendering while maintaining a unified, manageable component rather than separate complex assemblies.
Solution Approach 2:
The patent applies the neodymium compound filtering function locally within specific wavelength regions (yellow light) rather than attempting to control all wavelengths. This localized approach to light filtering targets only the problematic yellow region, improving color metrics without requiring complex system-wide modifications.
3Illumination intensity
If the concentration of neodymium compound particles is increased to improve colorimetric properties, then the filtering effect strengthens, but the manufacturing precision requirements increase
Solution Approach 1:
The patent establishes specific parameter ranges for neodymium compound concentration (0.4% to 8% by weight) that balance filtering effectiveness with manufacturing feasibility. Within this range, the system achieves sufficient yellow light filtration and improved colorimetric properties while avoiding the need for extremely precise doping control that would be required at higher concentrations.
Solution Approach 2:
The patent employs a moderate concentration of neodymium compounds (0.4% to 8%) that provides sufficient filtering effect without requiring maximum or excessive concentrations. This partial action approach achieves the necessary colorimetric improvement while maintaining ease of manufacture and avoiding overly stringent precision requirements.
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 material significantly improves the Color Rendering Index (CRI), R9, and Color Saturation Index (CSI) of LED light, providing better light performance and color accuracy by filtering yellow light and optimizing the refractive indices of the polymeric matrix and neodymium compound particles.
Implementation Method 1
particles of neodymium compound doped in the polymeric matrix material, wherein a weight percentage of the particles of neodymium compound in the composite material is from 0.4% to 8%... at least part of the yellow light generated by the white LED package is filtered by the optical component
Data Source
AI summary
A composite material for light filtering, comprising: a polymeric matrix material and particles of neodymium compound doped in the polymeric matrix material. A lighting apparatus comprises the composite material, a method for determining a doping concentration of particles of neodymium compound in the composite material, and a method for determining a thickness of the composite material are also described.