Coarse-Grained Nitridosilicate Phosphor Thermal Management
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Solution Overview
Problem
Current radiation conversion technologies face challenges with miniaturization, thermal stability, and efficiency due to overheating and damage from high-energy excitation radiation, particularly in applications like pico-projection and high-power LEDs, where phosphor layers are prone to thermal destruction and have limited heat dissipation and stability issues.
Innovation Solution
A device using a conversion element with coarse-grained nitridosilicate phosphors and a condensed metal phosphate binder for improved heat dissipation and stability, allowing for high-energy excitation radiation conversion while maintaining mechanical and thermal stability, and enabling efficient radiation conversion with reduced thermal quenching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-power LEDs or laser diodes are used as radiation sources to achieve high energy efficiency and high intensity, then the excitation radiation power increases, but the conversion element overheats and suffers thermal damage
Solution Approach 1:
The conversion element is divided into multiple phosphor layers with different phosphor materials, each layer converting a portion of the excitation radiation. This segmentation distributes the thermal load across multiple layers rather than concentrating it in a single phosphor layer, thereby reducing the temperature rise in each individual layer while maintaining high conversion efficiency.
Solution Approach 2:
The patent uses composite phosphor materials with different thermal conductivities and emission characteristics arranged in multiple layers. The composite structure allows optimization of both optical conversion efficiency and thermal management, as different phosphor materials can be selected for their specific thermal and optical properties to handle the high-power excitation radiation.
2Temperature
If multiple conversion elements are arranged on a rotating phosphor wheel to distribute thermal load, then the temperature of individual conversion elements decreases, but the device complexity and installation space increase
Solution Approach 1:
The patent extracts the thermal management function from the mechanical rotation system by using stationary multiple phosphor layers with high thermal conductivity substrates. This eliminates the need for rotating phosphor wheels while achieving similar thermal distribution效果, thereby reducing device complexity and eliminating moving parts.
Solution Approach 2:
The mechanical rotation system is replaced with a stationary multi-layer phosphor structure that uses thermal conduction and optical design to distribute thermal load. This substitution eliminates moving parts, reduces mechanical complexity, and improves reliability while maintaining effective thermal management.
3Productivity
If phosphor layers are used for radiation conversion to expand spectral ranges, then the conversion efficiency increases, but the phosphor layers are prone to thermal destruction and have limited heat dissipation
Solution Approach 1:
The patent employs composite phosphor materials with different thermal conductivities and emission characteristics arranged in multiple layers. The composite structure allows optimization of both optical conversion efficiency and thermal management, as different phosphor materials can be selected for their specific thermal and optical properties to handle the high-power excitation radiation.
Solution Approach 2:
The patent changes the thermal and optical parameters of the phosphor layers by selecting materials with different properties and arranging them in specific configurations. This allows optimization of the balance between conversion efficiency and thermal stability, enabling the system to operate at high powers without phosphor degradation.
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 a temperature-resistant, weather-resistant, and high-efficiency conversion element with extended service life, capable of handling high-power densities and maintaining optical stability under extreme conditions, suitable for applications in miniaturized projection systems and high-performance LEDs.
Implementation Method 1
The conversion element has phosphors and is arranged at a distance to the radiation assembly in a beam path of the excitation radiation
Implementation Method 2
one possibility for opening up further spectral ranges is, for example, radiation conversion, in which phosphors are irradiated by means of LEDs and/or laser diodes and in turn emit radiation of another wavelength
Implementation Method 3
A device using a conversion element with coarse-grained nitridosilicate phosphors and a condensed metal phosphate binder for improved heat dissipation and stability
Data Source
AI summary
Various embodiments may relate to a device for providing electromagnetic radiation, including a radiation assembly for generating excitation radiation, and at least one conversion element for generating conversion radiation, which has at least one first phosphor and which is arranged at a distance to the radiation assembly in a beam path of the excitation radiation. As the first phosphor, a nitridosilicate of the type M2Si5N8:D is used, wherein D= activator and wherein M is selected from the group barium, strontium, calcium alone or in combination, wherein the mean grain size d50 of the phosphor is at least 10 μm.