Fluorescence Emitting Module With Rotating Sintered Substrate
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Solution Overview
Problem
Conventional fluorescence emitting modules suffer from low light usage efficiency due to reflection losses at the substrate-atmosphere interface and thermal conductivity issues, leading to reduced fluorescence generation and reliability.
Innovation Solution
A fluorescence emitting module with a sintered fluorescent substrate and a rotator that rotates the substrate to reduce reflection and enhance heat dissipation, using a highly heat-conductive material with a thermal conductivity range of 100 W/m·K to 300 W/m·K to manage thermal quenching and maintain chromaticity stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional substrate for fluorescence is used, then the structure is simple, but light usage efficiency is low due to reflection at the substrate-atmosphere interface
Solution Approach 1:
The patent converts the harmful reflection effect into a beneficial one by applying a reflective layer on the rear surface of the substrate. This reflective layer reflects excitation light that would otherwise be lost back toward the fluorescence generator, transforming the loss mechanism into a light-enhancing mechanism that improves overall light usage efficiency
Solution Approach 2:
The patent addresses the reflection problem by adding a functional layer in a different dimension (the rear surface of the substrate) rather than modifying the front surface where light enters. This dimensional approach allows the reflective layer to capture and redirect light without interfering with the primary light entry path
2Ease of manufacture
If transparent resin is used as the fluorescence generator material, then ease of manufacture is improved, but thermal conductivity is low causing poor heat dissipation
Solution Approach 1:
The patent creates a composite fluorescence generator by mixing fluorescent particles with a transparent resin binder. This composite structure combines the manufacturing advantages of resin with the heat dissipation capabilities of the fluorescent material particles themselves, which act as heat sinks distributed throughout the generator volume
Solution Approach 2:
The patent utilizes the porous or particulate structure of the fluorescent material within the resin matrix to enhance heat dissipation. The numerous particle-resin interfaces and the inherent thermal pathways through the fluorescent particles create multiple heat conduction routes, improving overall thermal management while maintaining the resin's manufacturing benefits
3Ease of manufacture
If transparent resin is used in the fluorescence generator, then ease of manufacture is improved, but reliability is low due to thermal quenching and detachment
Solution Approach 1:
The patent converts the thermal quenching problem into a manageable parameter by optimizing the fluorescent particle size distribution and concentration. Smaller particles provide larger surface area for heat dissipation to the resin, reducing thermal quenching effects. The patent also uses the resin's thermal expansion properties to create a buffer that prevents detachment under thermal cycling
Solution Approach 2:
The patent optimizes multiple parameters including fluorescent particle size (using finer particles to reduce thermal quenching), particle concentration, and resin composition to achieve a balance between manufacturing ease and reliability. By carefully controlling these parameters, the patent maintains chromaticity stability while preserving the manufacturing advantages of using resin
4Ease of manufacture
If transparent resin is used in the fluorescence generator, then ease of manufacture is improved, but thermal conductivity is low causing detachment due to thermal expansion mismatch
Solution Approach 1:
The patent applies local quality enhancement by concentrating heat dissipation pathways at the particle-resin interfaces and using fluorescent particles with inherently better thermal conductivity than the bulk resin. This localized thermal management reduces thermal stress concentration at critical bonding interfaces, preventing detachment while maintaining the overall resin-based structure's manufacturing advantages
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 significantly improves light usage efficiency and reliability by minimizing reflection losses and effectively dissipating heat, resulting in enhanced fluorescence generation and stability of the light output.
Implementation Method 1
a fluorescence generator that is excited by the excitation light and generates fluorescence
Implementation Method 2
a highly heat-conductive material having a thermal conductivity in a range from 100 W/m·K to 300 W/m·K
Implementation Method 3
a portion of the excitation light that enters the substrate for fluorescence from the atmosphere is reflected toward the atmosphere
Data Source
AI summary
A fluorescence emitting module includes: a fluorescent substrate consisting essentially of a sintered fluorescent substance that includes a fluorescent material; and a rotator that rotates the fluorescent substrate about an axis extending in a thickness direction of the fluorescent substrate.