White Light LED Module with LuAG and Nitride Phosphors for Textile Color Accuracy
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Solution Overview
Problem
Conventional LED modules emitting light at 3000K with a color rendering index (CRI) of 90 produce a 'dirty' yellowish light when illuminating white textiles, deviating from brilliant white and showing significant color deviation compared to gas discharge lamps.
Innovation Solution
A white light LED module with a color temperature of 3245K-3255K, incorporating LED chips emitting in the blue spectrum and color conversion materials like LuAG and nitrides, ensuring a CRI of at least 90 by optimizing the spectral distribution to minimize variance across color rendering values, particularly in the red and blue spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If LED modules with color temperature of 3000K and CRI of 90 are used, then energy efficiency and service life are improved, but color rendering accuracy deteriorates (produces dirty yellowish light)
Solution Approach 1:
The patent adjusts the color temperature parameter to 3245K-3255K (specifically 3250K) and optimizes the spectral power distribution to achieve CRI≥90 with R9≥90, eliminating the yellowish cast while maintaining LED longevity. This parameter optimization resolves the contradiction by finding the precise operating point where both service life and color accuracy are maximized
Solution Approach 2:
The patent employs a composite approach by combining multiple LED chips (blue LED chip and violet LED chip) with carefully selected phosphors (yellow phosphor, green phosphor, red phosphor) to create a multi-component light source. This composite structure enables precise spectral control to achieve accurate color rendering while maintaining LED energy efficiency and long service life
2Use of energy by stationary object
If LED modules with color temperature of 3000K and CRI of 90 are used, then energy consumption is reduced, but color fidelity deteriorates (deviation from reference light source)
Solution Approach 1:
The patent optimizes the spectral power distribution parameters across different wavelength ranges (400-480nm, 480-540nm, 540-680nm, 680-780nm) to achieve CRI≥90 and R9≥90 at 3250K color temperature. This parameter optimization ensures color fidelity comparable to gas discharge lamps while maintaining LED energy efficiency
Solution Approach 2:
The patent combines blue LED chips (440-450nm) with violet LED chips (405-425nm) and multiple phosphors including yellow phosphor (560-580nm), green phosphor (500-540nm), and red phosphor (610-650nm). This composite material system achieves accurate color rendering with CRI≥90 while consuming less energy than traditional gas discharge lamps
3Ease of manufacture
If conventional LED modules are used, then manufacturing simplicity is maintained, but color rendering quality deteriorates (yellowish cast on white textiles)
Solution Approach 1:
The patent uses a composite structure with blue LED chips, violet LED chips, and multiple phosphor materials (yellow phosphor, green phosphor, red phosphor) that can be applied as phosphor layers or phosphor particles. This composite approach achieves CRI≥90 and eliminates the yellowish cast while maintaining compatibility with standard LED manufacturing processes
Solution Approach 2:
The patent applies different phosphors with specific emission characteristics to different regions or layers: yellow phosphor for the yellow-green region, green phosphor for the green region, and red phosphor for the red region. This local quality approach ensures each wavelength range is optimized, achieving overall CRI≥90 with accurate color rendering
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 provides accurate color rendition with a CRI of 90 or higher, ensuring that the illumination of textiles, especially white and red materials, maintains their true color appearance within a tolerance range, comparable to gas discharge lamps while offering the benefits of LED technology such as long service life and energy efficiency.
Implementation Method 1
a first color conversion material, preferably LuAG, which has a dominant emission wavelength in the green spectrum... and a second color conversion material, preferably a nitride, which has a dominant emission wavelength in the red spectrum
Data Source
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AI summary
The invention relates to a white light LED module having at least one LED chip, wherein the LED chip emits light in the blue spectrum, preferably in the range from 440-455 nm, in particular in the range form 445-450 nm, wherein the LED module furthermore has: a first color conversion material, preferably LuAG, which has a dominant emissions wavelength in the green spectrum, preferably in the range from 475 - 625 nm and in particular in the range from 500 - 575 nm, a second color conversion material, preferably a nitride, which has a dominant emissions wavelength in the red spectrum, preferably in the range from 645 - 655 nm and in particular at 650 nm.