Polycrystalline Translucent Substrate for Light Scattering Control
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Solution Overview
Problem
Luminance devices face challenges in adjusting light scattering, leading to color unevenness and reduced output, due to limitations in phosphor forms and support materials, which affect temperature stability and light transmission characteristics.
Innovation Solution
An optical component with a phosphor substrate supported by a translucent substrate having a polycrystalline structure with adjustable orientation, allowing for controlled light scattering by modifying the orientation of the translucent substrate, thereby optimizing light scattering in the support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If phosphor is dispersed in binder, then light scattering is large, but internal quantum efficiency decreases at high temperatures and binder deteriorates
Solution Approach 1:
The invention extracts and eliminates the binder material from the phosphor structure. By using a binder-free phosphor configuration where phosphor particles are directly in contact with each other and the transparent substrate, the patent removes the source of high-temperature deterioration while maintaining appropriate light scattering through controlled phosphor particle arrangement and size distribution.
Solution Approach 2:
The invention changes the physical parameters of the phosphor layer by controlling particle size, size distribution, and packing density. By optimizing these parameters, the patent achieves sufficient light scattering without requiring a binder, thereby maintaining temperature stability while preventing excessive light attenuation.
2Reliability
If single crystal phosphor is used, then internal quantum efficiency is maintained at high temperatures, but large crystal production is difficult and concentration unevenness occurs
Solution Approach 1:
The invention divides the phosphor into multiple small particles instead of using a single large crystal. This segmentation approach maintains the temperature stability benefits of crystalline phosphor while avoiding the manufacturing difficulties of large single crystals. The small particles can be easily produced and distributed uniformly, eliminating concentration unevenness issues.
Solution Approach 2:
The invention creates a composite structure where multiple phosphor particles are arranged in a binder-free configuration. This composite approach combines the temperature stability of crystalline materials with the manufacturing ease of particulate systems, achieving both reliability and ease of manufacture.
3Ease of manufacture
If polycrystalline phosphor is used, then large crystals are easily obtained, but light scattering is moderate and may be insufficient
Solution Approach 1:
The invention applies local quality control by varying phosphor particle size and distribution in different regions of the phosphor layer. By creating a gradient or specific distribution pattern of particles with different sizes, the patent enhances light scattering in specific areas while maintaining overall uniformity, thereby achieving sufficient scattering without compromising manufacturing ease.
4Stability of the object's composition
If light scattering is increased, then color unevenness is reduced, but light attenuation becomes large and output is reduced
Solution Approach 1:
The invention optimizes multiple parameters simultaneously including phosphor particle size (0.1-10 μm), size distribution, packing density, and layer thickness. By carefully balancing these parameters, the patent achieves sufficient light scattering for color uniformity while minimizing total light attenuation, thereby maintaining high light output.
Solution Approach 2:
The invention applies partial scattering action by using moderate particle concentrations and sizes that provide just enough scattering to achieve color uniformity without excessive scattering that would cause significant light attenuation. This partial action approach optimizes the balance between color uniformity and light output.
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
This configuration enables arbitrary adjustment of light scattering, reducing color unevenness and maintaining high output by ensuring appropriate light scattering without excessive attenuation, even under high temperature conditions.
Implementation Method 1
a translucent substrate (21) having a polycrystalline structure with orientation... by adjusting the orientation of the translucent substrate (21), the degree of light scattering can be adjusted
Implementation Method 2
A blue light emitting laser is exemplified as a radiation source. The blue laser light passes through a yellow phosphor and is converted into white light due to the complementary color effect thereof
Data Source
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Figure 5
AI summary
An optical component (50) includes a first substrate (10) including a phosphor substrate (11) and a second substrate (20) including a translucent substrate (21) and supporting the first substrate (10). The translucent substrate (21) has a polycrystalline structure with orientation.