Interferometric Filter Layout for pc-Amber Pump Coupling
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Solution Overview
Problem
Conventional automotive technologies using ceramic phosphor converted-amber (pc-amber) LEDs have a limited coupling efficiency of pump radiation into the converter layer, necessitating an improvement in radiation profile management.
Innovation Solution
Incorporating a second interferometric filter on the side opposite the light-emitting surface of the LED, combined with an anti-reflective coating, to enhance the coupling efficiency of pump radiation into the converter layer by manipulating radiation profiles and transmission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional pc-amber LED designs use interferometric filters at the light emitting surface to reflect pump radiation back, then some pump radiation is reflected, but the coupling efficiency of pump radiation into the converter layer remains limited
Solution Approach 1:
The patent inverts the conventional filter placement by positioning the interferometric filter at the side opposite the light emitting surface (the pump radiation input side) rather than at the light emitting surface. This inversion allows the filter to directly manipulate the incoming pump radiation profile before it enters the converter layer, significantly improving coupling efficiency while maintaining a relatively simple single-filter configuration
Solution Approach 2:
The patent modifies the radiation profile parameters of the pump light by using the interferometric filter to shape and control the angular and spectral distribution of the pump radiation. This parameter transformation optimizes the coupling between the LED chip and the converter layer, enabling more efficient energy transfer without adding complex multi-filter systems
2Productivity
If optimized films are used for phosphor conversion, then conversion performance is improved, but full conversion of pump radiation is not achieved due to limited coupling efficiency
Solution Approach 1:
The patent applies preliminary action by pre-shaping the pump radiation profile using the interferometric filter before the light enters the converter layer. This preliminary manipulation of the radiation profile ensures optimal coupling conditions are established in advance, maximizing the converter layer's ability to absorb and convert pump radiation into visible light, thereby reducing unconverted pump radiation
Solution Approach 2:
The interferometric filter acts as an intermediary element between the LED chip and the converter layer. It mediates the interaction by transforming the pump radiation characteristics to better match the converter layer's absorption profile, enabling more complete energy conversion while maintaining high productivity in the phosphor conversion process
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 configuration significantly improves the conversion efficiency and uniformity of light emission, enhancing the overall performance of pc-amber LEDs by increasing the percentage of pump radiation absorbed and controlling the emission profile.
Implementation Method 1
interferometric filters at a light emitting surface (LES) to reflect back the pump radiation
Implementation Method 2
the interferometric filters are an optical filter that reflect the pump radiation back
Implementation Method 3
The filter is deposited on the opposite side. The filter influences a radiation profile to increase a coupling efficiency of a pump radiation into the converter layer
Implementation Method 4
The second filter reflects into the converter one or more portions of light exiting the light emitting surface
Data Source
AI summary
A device is provided. The device includes a converter layer and a filter. The converter layer includes a light emitting surface and an opposite side of the light emitting surface. The filter is deposited on the opposite side. The filter influences a radiation profile to increase a coupling efficiency of a pump radiation into the converter layer.