Phosphor Device Reflective Substrate Red Light Output
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Solution Overview
Problem
Conventional phosphor devices in illumination systems suffer from insufficient output of red light due to low reflectivity of silver or aluminum coatings, leading to impaired color purity and luminance, especially under high energy conditions.
Innovation Solution
A phosphor device with a reflective substrate having multiple reflective spectra, allowing for enhanced reflectivity across all wavebands, including a dielectric film layer and specific phosphor agents to convert and separate light into wider wavebands for improved color purity and output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If silver or aluminum coatings are used in conventional phosphor devices, then the device structure is simple and manufacturing is easy, but the reflectivity is insufficient leading to impaired color purity and luminance
Solution Approach 1:
The patent applies composite materials by combining multiple dielectric layers with different refractive indices (e.g., TiO2, SiO2, Nb2O5, Ta2O5) to create a reflective substrate with enhanced reflectivity. This composite structure replaces simple silver or aluminum coatings, achieving superior optical performance through the synergistic effect of multiple materials with complementary properties.
Solution Approach 2:
The patent employs parameter changes by systematically varying the thickness of each dielectric layer (e.g., first layer 50-150nm, second layer 100-200nm, third layer 50-150nm) and their refractive indices to optimize the reflective spectrum. By adjusting these parameters, the device achieves maximum reflectivity across desired wavelength ranges, thereby improving luminance and color purity.
2Illumination intensity
If conventional phosphor devices use single waveband conversion, then the device structure is simple, but the color purity and luminance are insufficient
Solution Approach 1:
The patent applies segmentation by dividing the phosphor device into distinct functional sections: a reflective substrate with multiple dielectric layers for enhanced reflection, a phosphor layer for wavelength conversion, and a protective layer. This segmented structure allows each component to be optimized independently, achieving superior color purity and luminance while maintaining manufacturing feasibility.
Solution Approach 2:
The reflective substrate serves multiple functions: it provides structural support, enhances light reflection across broad wavebands, and acts as a platform for phosphor deposition. This multi-functionality reduces the need for additional separate components, achieving improved color purity without proportionally increasing device complexity.
3Power
If high energy conditions are applied to conventional phosphor devices, then the illumination output is high, but the red light output becomes insufficient due to low reflectivity
Solution Approach 1:
The patent employs parameter changes by designing the dielectric layer thicknesses and refractive indices to create a reflective spectrum that specifically enhances red light wavelengths. The optimized parameters ensure that even under high energy conditions, the red light portion of the spectrum is reflected efficiently, preventing the saturation and decay problems experienced by red phosphor in conventional devices.
Solution Approach 2:
The patent uses composite materials with specific optical properties (different refractive indices and absorption coefficients) to create a reflective substrate that selectively enhances red light reflection. This composite structure maintains high overall illumination output while specifically addressing the red light deficiency that occurs under high energy conditions in conventional single-material coatings.
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 enhances color purity and luminance by maximizing output across each waveband, reducing manufacturing costs and size, and improving the overall performance of the illumination system.
Implementation Method 1
The first phosphor agent is coated on the first section. After the first waveband light is received by the first phosphor agent, the first waveband light is converted into a second waveband light with a wider waveband, and the second waveband light is directed to the optical path
Implementation Method 2
A phosphor device with a reflective substrate having multiple reflective spectra, allowing for enhanced reflectivity across all wavebands
Data Source
AI summary
A phosphor device of an illumination system emitting a first waveband light and having an optical path includes a first section and a first phosphor agent. The first phosphor agent is coated on the first section. The first waveband light is received and converted into a second waveband light by the first phosphor agent. The second waveband light is directed to the optical path. The range of the spectrum of the second waveband light includes at least a first color light and a second color light, so that the first color light or the second color light is separated from the second waveband light along the optical path. Therefore, the diversity of the design of the phosphor device is enhanced, the manufacturing cost and the size of product are reduced, and the color purity is enhanced.