White Light Emitting Device Phosphor Layer Segmentation
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Solution Overview
Problem
Existing white light emitting devices lack the enhanced vividness of white and primary colors required for modern lighting applications, such as spot lighting for clothing, which emphasizes white colors effectively.
Innovation Solution
A white light emitting device is configured with a blue light emitting diode and multiple wavelength conversion materials, including green and red phosphors, to emit a spectrum of light defined by specific IES TM-30-15 indices, ensuring improved vividness and color preference, with a tailored emission spectrum that adjusts the red region's wavelength and weakens the yellow region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional phosphor combinations are used in white light emitting devices, then the device structure is simple and manufacturing is easier, but the vividness of white and primary colors is insufficient
Solution Approach 1:
The patent divides the phosphor system into distinct layers: a lower phosphor layer containing red and green phosphors, and an upper phosphor layer containing yellow phosphor. This segmentation allows independent optimization of each layer's phosphor composition and thickness to achieve desired color vividness while maintaining manufacturability through standardized layering processes
Solution Approach 2:
The patent employs composite phosphor materials with specific particle size distributions and composition ratios in each layer. The lower layer uses red phosphor (610-650nm) and green phosphor (500-540nm) in controlled proportions, while the upper layer contains yellow phosphor (560-580nm), creating a composite structure that enhances color vividness through synergistic effects
2Illumination intensity
If multiple phosphors are applied to achieve vivid colors, then color vividness improves, but the manufacturing precision and reproducibility become more difficult to control
Solution Approach 1:
By segmenting the phosphor system into separate layers with distinct functions, the patent simplifies the manufacturing control process. Each layer can be applied and cured independently, allowing for better control of phosphor distribution and reducing variability in color output across production batches
Solution Approach 2:
The patent specifies precise parameter ranges for phosphor particle sizes, thicknesses, and composition ratios to ensure reproducible manufacturing. The lower layer uses red phosphor (610-650nm) and green phosphor (500-540nm) in controlled proportions, while the upper layer contains yellow phosphor (560-580nm), with each parameter optimized to maintain consistent color vividness across production
3Adaptability or versatility
If the emission spectrum is optimized for vividness, then color preference increases, but the deviation from standard illuminant D65 increases
Solution Approach 1:
The patent carefully adjusts phosphor emission wavelength ranges and relative intensities to achieve optimal color preference. The lower layer uses red phosphor (610-650nm) and green phosphor (500-540nm), while the upper layer contains yellow phosphor (560-580nm), with each phosphor's characteristics selected to balance vividness enhancement against deviation from D65 standards
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 device achieves a significantly increased preference for vividness of white light, as evidenced by higher Svp values, with a color difference from Standard Illuminant D65 of less than 106, outperforming commercial devices in terms of TM-30-15 indices and providing enhanced color vividness.
Implementation Method 1
a blue light emitting diode chip having a dominant wavelength of 430 to 455 nm
Implementation Method 2
a red phosphor disposed around the blue light emitting diode chip, the red phosphor excited by the blue light emitting diode chip to emit red light
Implementation Method 3
a green phosphor disposed around the blue light emitting diode chip, the green phosphor excited by the blue light emitting diode chip to emit green light
Data Source
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AI summary
A white light emitting device (100A) may include a blue light emitting diode (130) configured to emit blue light and a plurality of wavelength conversion materials (154, 156) configured to convert the blue light into light having different wavelengths based on being excited by the blue light, and emit white light based on the converting, wherein the emitted white light is associated with an Illuminating Engineering Society (IES) TM-30-15 Fidelity Index (Rf) in a range of 78 to 89, an IES TM-30-15 Chroma Change by Hue Index Rcs15 in a range of 7% to 16%, and an IES TM-30-15 Chroma Change by Hue Index Rcs16 in a range of 7% to 16%, and a color difference between a reflection spectrum of a white specimen of the emitted white light, and International Commission on Illumination (CIE) Standard illuminant D65, that is equal to or less than 106.