Edge-Coupled Luminescent Layer for Uniform Radiation Emission
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Solution Overview
Problem
Radiating devices face issues such as obstructed view, opacity, insufficiently uniform intensity, and low efficiency due to the location of the radiation source and material properties, particularly when dealing with defrosting, defogging, and photo-catalytic applications.
Innovation Solution
A radiation emitting device with a radiation source coupled to an edge of a radiation emitting layer, comprising a host material and luminescent agents, where the radiation source excites the luminescent agents to emit radiation uniformly across broad surfaces, overcoming the limitations of traditional designs by allowing emission from both surfaces and adapting to materials with higher refractive indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the radiation source is placed at the center or opposite of broad surfaces, then the view through the device is unobstructed, but the radiation intensity becomes insufficient far from the perimeter and uniformity is poor
Solution Approach 1:
The patent transitions from placing the radiation source in the plane of or opposite the broad surfaces to positioning it at the edge of the radiation emitting layer. This dimensional change allows radiation to enter through the edge and propagate through the layer, achieving uniform emission from both broad surfaces without obstructing the view through the device.
Solution Approach 2:
The patent divides the radiation emitting layer into distinct geometric components with a specific aspect ratio (length L to height d ratio ≥ 10). This segmentation allows the edge-coupled source to effectively illuminate the entire broad surface area through controlled propagation within the layer.
2Illumination intensity
If the radiation source is placed at the edge of the radiation emitting layer, then uniform radiation emission is achieved across broad surfaces, but the source may obstruct the view through the device
Solution Approach 1:
The patent applies local quality by concentrating the radiation source at the edge region rather than distributing it across the center. This localized positioning creates uniform radiation emission from the broad surfaces while minimizing obstruction, as the source occupies only the edge region rather than blocking the central view path.
3Reliability
If materials with higher refractive indices are used in the radiation emitting layer, then the efficiency of radiation emission is reduced due to total internal reflection
Solution Approach 1:
The patent inverts the conventional approach by coupling the radiation source to the edge rather than placing it opposite the broad surfaces. This inversion changes the radiation entry path, allowing light to propagate through the high refractive index material from the edge, which reduces total internal reflection losses and improves emission efficiency while maintaining material flexibility.
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 achieves uniform radiation emission, enhanced efficiency, and improved performance in defrosting, defogging, and photo-catalytic applications by ensuring that the radiation is emitted uniformly and effectively, even when materials with higher refractive indices are present, thereby addressing the drawbacks of existing technologies.
Implementation Method 1
the source radiation is transmitted from the radiation source through the edge and excites the luminescent agent, whereafter the luminescent agent emits an emitted radiation
Implementation Method 2
at least a portion of the emitted radiation exits through at least one of the broad surfaces through an escape cone
Data Source
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AI summary
In an embodiment, a radiation emitting device comprises a radiation emitting layer comprising a host material and a luminescent agent; and a radiation source that emits a source radiation; wherein the radiation emitting layer comprises an edge and two broad surfaces, wherein the edge has a height of d and the broad surfaces have a length L, wherein length L is greater than height d, and the ratio of L to d is greater than or equal to 10; and wherein the radiation source is coupled to the edge, wherein the source radiation is transmitted from the radiation source through the edge and excites the luminescent agent, whereafter the luminescent agent emits an emitted radiation, wherein at least a portion of the emitted radiation exits through at least one of the broad surfaces through an escape cone.