Ceramic Conversion Element With Columnar Regions And Reflective Coating
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Solution Overview
Problem
Ceramic conversion elements emit light of varying colors when viewed from different angles due to non-homogeneous light emission, particularly through side surfaces, which affects their performance in optoelectronic semiconductor components.
Innovation Solution
A ceramic conversion element with columnar regions within a ceramic or vitreous matrix, where the columnar regions are aligned at an angle of up to 45° with the main surface, and are formed from wavelength-converting monocrystalline or ceramic fibers and/or platelets with a reflective coating, which convert electromagnetic radiation from one wavelength range to another, reducing side emission by structuring the bulk material to enhance radiation reflection towards the main surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ceramic conversion elements have homogeneous bulk material, then manufacturing is simple, but the color of emitted light varies with observation angle
Solution Approach 1:
The bulk material is segmented into a multiplicity of columnar regions arranged within a ceramic or vitreous matrix. Each columnar region contains fibers and/or platelets with specific orientations, creating localized optical properties that collectively achieve angle-independent light emission while maintaining manufacturing feasibility through modular structure formation
Solution Approach 2:
Different regions within the conversion element are given different local optical properties through the columnar structure. The fibers and platelets in each columnar region are oriented to convert light locally, with the collective arrangement of regions with varying local properties achieving uniform overall emission across different observation angles
2Loss of energy
If light is emitted through side surfaces, then radiation exit is maximized, but color uniformity deteriorates
Solution Approach 1:
The side surfaces of individual columnar regions are equipped with specific optical properties through oriented fibers and platelets. Each columnar region's side surfaces are designed to emit converted light with specific characteristics, and the collective arrangement of these regions with different local emission properties achieves angle-independent overall emission while maintaining high radiation exit efficiency
3Ease of operation
If columnar regions are aligned perpendicular to main surface, then light emission directionality is improved, but manufacturing alignment precision becomes difficult
Solution Approach 1:
The orientation parameter of columnar regions is changed from strict perpendicular alignment to an angular range of at most 45° with the normal to the main surface. This parameter change maintains sufficient emission directionality for optimal performance while significantly reducing manufacturing alignment precision requirements, making production more feasible
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 ensures a more uniform light emission color across angles and reduces radiation exit from side surfaces, providing an additional degree of freedom for controlled emission spectrum modification and improved performance in optoelectronic semiconductor components.
Implementation Method 1
the fibers and/or the platelets convert electromagnetic radiation of a first wavelength range into electromagnetic radiation of a second wavelength range different from the first wavelength range
Implementation Method 2
said fibers and/or said platelets are provided with a reflective coating
Data Source
AI summary
A ceramic conversion element having a multiplicity of columnar regions arranged within a ceramic or vitreous matrix, wherein the columnar regions have a preferential direction which makes an angle of at most 45° with a normal to the main surface of the conversion element, at least either the columnar regions or the matrix convert electromagnetic radiation of a first wavelength range into electromagnetic radiation of a second wavelength range different from the first wavelength range and, the columnar regions are formed by wavelength-converting monocrystalline or ceramic fibers and/or monocrystalline or ceramic platelets, said fibers and/or said platelets are provided with a reflective coating.