Reflective Element Spectral Selectivity in Optoelectronic Components
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Solution Overview
Problem
Optoelectronic components face inefficiencies due to absorption losses when converting electromagnetic radiation from one spectral range to another, as radiation from the converted spectral range is often absorbed by the semiconductor chip rather than being emitted effectively.
Innovation Solution
Incorporating a reflective element with distinct reflectivity in different spectral ranges, arranged between the semiconductor chip and the wavelength-converting element, or on the semiconductor chip's radiation emission face, to enhance the reflection of converted radiation and reduce absorption losses, thereby increasing the efficiency of electromagnetic radiation emission in the desired spectral range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wavelength-converting element is used to convert electromagnetic radiation from the first spectral range to the second spectral range, then the spectral range of emitted radiation is extended, but absorption losses increase because the converted radiation is absorbed by the semiconductor chip instead of being emitted effectively
Solution Approach 1:
A reflective element is introduced as an intermediary component between the semiconductor chip and the wavelength-converting element. This reflective element has wavelength-dependent reflectivity: it is highly reflective in the second spectral range (above 1200 nm) to prevent absorption losses, while being transparent or low-reflective in the first spectral range (below 1100 nm) to allow the converted radiation to pass through to the wavelength-converting element. This intermediary component resolves the contradiction by enabling spectral extension while minimizing energy loss.
2Productivity
If the reflective element has high reflectivity in the first spectral range, then more radiation is reflected back to the wavelength-converting element, but less radiation passes through to be converted and emitted in the desired spectral range
Solution Approach 1:
The reflective element exhibits spatially varying optical properties based on wavelength: it has high reflectivity for radiation in the second spectral range (above 1200 nm) and low reflectivity (high transmission) for radiation in the first spectral range (below 1100 nm). This wavelength-dependent local quality allows the same component to serve dual functions: protecting against absorption losses for converted radiation while permitting efficient operation of the wavelength-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
The reflective element significantly increases the ratio of electromagnetic radiation emitted in the second spectral range compared to the first, reducing absorption losses and enhancing the overall efficiency of the optoelectronic component by effectively reflecting converted radiation back out.
Implementation Method 1
a wavelength-converting element configured to convert electromagnetic radiation including a wavelength from the first spectral range into electromagnetic radiation including a wavelength from a second spectral range
Implementation Method 2
a reflective element including a first reflectivity in the first spectral range and a second reflectivity in the second spectral range, wherein the first spectral range is below 1100 nm, and the second spectral range is above 1200 nm
Data Source
AI summary
An optoelectronic component includes an optoelectronic semiconductor chip configured to emit electromagnetic radiation including a wavelength from a first spectral range, a wavelength-converting element configured to convert electromagnetic radiation including a wavelength from the first spectral range into electromagnetic radiation including a wavelength from a second spectral range, and a reflective element including a first reflectivity in the first spectral range and a second reflectivity in the second spectral range, wherein the first spectral range is below 1100 nm, and the second spectral range is above 1200 nm.