PTFE Color Converting Surfaces for LED Illumination Modules
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Solution Overview
Problem
Illumination devices using LEDs face limitations in light output level, color quality, and cost due to color point instability, poor color rendering, and spatial/angular variations, necessitating improvements in LED-based lighting solutions.
Innovation Solution
Incorporating a polytetrafluoroethylene (PTFE) material with a wavelength converting material in the light conversion sub-assembly of LED-based illumination modules, which unexpectedly increases luminous output despite being less reflective than other materials, and allows for improved color conversion and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If more reflective materials are used in the light conversion sub-assembly, then light reflection efficiency is improved, but luminous output is reduced due to poor color conversion
Solution Approach 1:
The patent uses a composite material consisting of PTFE base material combined with wavelength converting particles (such as phosphors). This composite structure allows the material to simultaneously provide high reflectivity through the PTFE matrix and effective color conversion through the embedded wavelength converting particles, resolving the contradiction between reflection efficiency and luminous output quality
Solution Approach 2:
The patent applies different functional properties to different regions of the light conversion sub-assembly. The PTFE material provides the reflective matrix while localized regions contain wavelength converting materials with specific spectral characteristics. This local differentiation allows optimization of both reflection and color conversion in their respective zones, achieving high luminous output with good color rendering
2Reliability
If LEDs are selected to meet color and flux requirements, then color quality is improved, but device cost increases due to limited selection and additional control electronics
Solution Approach 1:
The patent changes the spectral parameters of the light source by using wavelength converting materials that absorb blue or UV light and emit at different wavelengths. This allows the use of inexpensive blue or UV LEDs while achieving the desired color temperature and quality through phosphor conversion, eliminating the need for expensive color control electronics and selective LED sorting
Solution Approach 2:
The wavelength converting material acts as an intermediary between the LED light source and the final output. It mediates the spectral transformation, converting the LED's native wavelength into the desired output spectrum. This intermediary approach simplifies the overall system by replacing complex color control electronics with passive optical conversion materials
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 use of PTFE with wavelength converting materials enhances luminous output and color rendering, providing a more stable and efficient LED-based lighting solution with increased durability, addressing the limitations of existing LED illumination devices.
Implementation Method 1
a wavelength converting material
Implementation Method 2
Despite being less reflective than other materials that may be used in the light conversion sub-assembly
Data Source
AI summary
An illumination module includes a plurality of Light Emitting Diodes (LEDs) and a light conversion sub-assembly mounted near but physically separated from the LEDs. The light conversion sub-assembly includes at least a portion that is a polytetrafluoroethylene (PTFE) material that also includes a wavelength converting material. Despite being less reflective than other materials that may be used in the light conversion sub-assembly, the PTFE material unexpectedly produces an increase in luminous output, compared to other more reflective materials, when the PTFE material includes a wavelength converting material.