Condensed Metal Phosphate Matrix for Thermal Management in Radiation Conversion
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Solution Overview
Problem
Current illumination systems using high-power LEDs and lasers face challenges with heat dissipation and stability due to the limitations of traditional binders and substrates, leading to efficiency reduction and potential damage from high luminous power densities, especially in miniaturized applications like pico-projection where space and cooling are critical.
Innovation Solution
A device utilizing a conversion element with a condensed metal phosphate matrix that embeds phosphors, providing improved thermal conductivity and stability, allowing for efficient heat dissipation and long-term operation without direct physical contact with the radiation source, and using a sol-gel method to produce the matrix at lower temperatures, reducing the risk of phosphor damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-power radiation sources are used to generate excitation radiation, then the intensity and luminous power density are improved, but the conversion element overheats and suffers damage
Solution Approach 1:
A heat dissipation element is introduced as an intermediary between the conversion element and the environment. This mediator facilitates thermal energy transfer from the conversion element to the heat dissipation element, preventing overheating while allowing high-power operation. The heat dissipation element acts as a thermal bridge that protects the conversion element from excessive temperature rise.
Solution Approach 2:
The conversion element is constructed as a composite structure comprising phosphor particles embedded in a binder material. This composite design allows optimization of thermal properties through material selection - the binder can be chosen for its thermal conductivity while the phosphor provides the radiation conversion function. The composite structure enables simultaneous achievement of high power handling and thermal management.
2Reliability
If the conversion element is cooled efficiently, then thermal damage is prevented, but the device complexity increases
Solution Approach 1:
The heat dissipation element is merged with the existing device structure rather than being added as a separate cooling system. By integrating the heat dissipation function into the device housing or mounting structure, thermal management is achieved without proportionally increasing device complexity. The same structural component serves both mechanical support and thermal management functions.
Solution Approach 2:
The conversion element design enables passive heat dissipation through proper material selection and geometric configuration. The binder material and phosphor particle arrangement are designed to facilitate natural heat flow from high to low temperature regions. This self-service approach to thermal management reduces the need for active cooling systems while maintaining conversion element stability.
3Adaptability or versatility
If phosphors are used for radiation conversion, then spectral range expansion is achieved, but conversion losses occur due to thermal quenching
Solution Approach 1:
The binder material parameters are optimized to change the thermal environment of the phosphors. By selecting binder materials with specific thermal conductivity, heat capacity, and thermal stability parameters, the thermal quenching effect is reduced. The binder creates a thermal field that maintains lower operating temperatures for the phosphors, thereby reducing conversion losses while preserving spectral conversion capabilities.
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 enables high-efficiency conversion radiation with improved thermal and chemical stability, extended lifetime, and reduced risk of damage from high-power excitation radiation, suitable for miniaturized applications like pico-projection systems.
Implementation Method 1
The conversion element includes a condensed metal phosphate matrix that embeds phosphors, providing improved thermal conductivity and stability, allowing for efficient heat dissipation
Implementation Method 2
The conversion element includes phosphors and is arranged at a distance from the radiation arrangement in a beam path of the excitation radiation
Implementation Method 3
In radiation conversion, in which phosphors are irradiated by means of LEDs and/or laser diodes and in turn emit light of a different wavelength
Data Source
AI summary
A device for providing electromagnetic radiation may include a radiation arrangement for generating excitation radiation, and at least one conversion element for generating conversion radiation, which includes condensed metal phosphate and phosphors embedded in the condensed metal phosphate, and is arranged at a distance from the radiation arrangement in a beam path of the excitation radiation. The conversion element includes a silicatic matrix and alkali metal phosphate.