Scattering Body Luminescent Device for Compact Heat Management
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Solution Overview
Problem
High luminance light sources, such as those used in endoscopy and projection apparatus, suffer from power loss due to heat emission during the conversion of pump light to longer wavelengths, necessitating a more efficient design for luminescent devices that minimizes heat sink requirements and allows for compact structures.
Innovation Solution
A luminescent device featuring a scattering body with specific angular relationships between the input and output of pump and converted light, utilizing scattering centers to deviate light paths, allowing for operation in transmission mode without additional optical elements on the rear side, thereby enabling a compact structure and efficient light conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a luminescent element is operated in reflection mode with a heat sink on the rear side, then heat dissipation is improved, but the device complexity and space requirements increase
Solution Approach 1:
The patent inverts the conventional reflection mode operation by using transmission mode, where pump light enters one side and converted light exits the opposite side. This inversion eliminates the need for rear-side heat sinks and complex optical elements, while the scattering body's internal structure handles heat management differently through its material composition and geometry.
Solution Approach 2:
The patent extracts and removes the rear-side heat sink and additional optical elements from the conventional reflection mode design. By operating in transmission mode with a scattering body, the design eliminates these separate components while maintaining effective heat dissipation through the scattering body's inherent properties.
2Use of energy by moving object
If additional optical elements are added to the rear side for light control, then light conversion efficiency is improved, but the device complexity and overall size increase
Solution Approach 1:
The scattering body performs multiple functions simultaneously: it scatters pump light to increase path length and absorption efficiency, converts light wavelengths through the luminescent substance, and manages heat dissipation. This multi-functionality eliminates the need for separate optical elements on the rear side, reducing device complexity while maintaining high light conversion efficiency.
Solution Approach 2:
The patent merges the scattering function, luminescent conversion function, and heat management function into a single integrated scattering body structure. This consolidation eliminates the need for separate rear-side optical elements and heat sinks, reducing both device complexity and overall size while maintaining efficient light conversion.
3Volume of moving object
If the scattering body deviates light significantly from the principal propagation direction, then compact structure is achieved, but the angle control precision becomes more difficult
Solution Approach 1:
The patent optimizes the scattering particle parameters (size, concentration, material properties) to achieve the desired balance between light deviation and angle control. By carefully selecting scattering particle diameters in the range of 0.1-10 micrometers and adjusting their concentration, the design achieves significant light deviation for compactness while maintaining acceptable angle control through the scattering body's optical properties.
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 design reduces the need for optical elements on the rear side, allowing for a more compact illumination device and enabling the use of space for cooling or other purposes, while maintaining efficient light conversion and filtering capabilities.
Implementation Method 1
the scattering body is configured to scatter pump light, propagating in the scattering body in a principal propagation direction after input, by means of the scattering centers in such a way that converted light passes through the exit face in a principal emission direction
Implementation Method 2
a luminescent element which converts pump light and is arranged at a distance from the pump light source. By means of the luminescent element, conversion of e.g. ultraviolet or blue pump light into longer wavelength converted light is carried out
Implementation Method 3
conversion of e.g. ultraviolet or blue pump light into longer wavelength converted light is carried out, during which a power loss emitted in the form of heat typically always occurs, for instance owing to the Stokes shift
Data Source
AI summary
A luminescent device is disclosed comprising a luminescent substance for the conversion of pump light, wherein a scattering body which scatters the pump light is provided. The pump light input into the scattering body may first be scattered at inert scatterers provided in the scattering body and subsequently converted. Light scattered at luminescent particles may also be simultaneously converted.