Silicon Carbide Heating with Red LED Wavelengths
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Solution Overview
Problem
Existing heating systems using blue LEDs are not optimal for non-silicon semiconductor substrates like silicon carbide, as they do not absorb light efficiently, leading to suboptimal heating results.
Innovation Solution
A system utilizing red LEDs emitting light between 600 nm and 650 nm, combined with collimating optics and potentially a diffuser, to enhance absorption and efficiency in heating silicon carbide substrates, allowing for greater distance and uniformity between the LEDs and the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If blue LEDs (450-500 nm) are used to heat silicon carbide substrates, then the heating system can be simple and use readily available components, but the substrate does not absorb the light efficiently leading to poor heating performance
Solution Approach 1:
The patent changes the wavelength parameter of the LED light source from the conventional blue range (450-500 nm) to the red range (600-650 nm). This parameter change aligns the LED emission spectrum with the absorption characteristics of silicon carbide, which has higher absorption coefficients in the red wavelength range, thereby significantly improving heating efficiency while maintaining component availability
Solution Approach 2:
The patent applies color changes by selecting LEDs that emit red light (600-650 nm) instead of blue light. This color selection is based on the absorption spectrum of silicon carbide, which absorbs red light more efficiently. The color change directly addresses the mismatch between blue LED emission and silicon carbide absorption, resolving the technical contradiction
2Device complexity
If blue LEDs are used for heating, then the system structure can be simple, but the absorption coefficient of silicon carbide at these wavelengths is low resulting in high power requirements and energy waste
Solution Approach 1:
By changing the operational wavelength parameter from blue (450-500 nm) to red (600-650 nm), the system achieves better coupling with silicon carbide absorption. This reduces the power required for effective heating and minimizes energy loss, while keeping the overall system structure relatively simple
Solution Approach 2:
The patent converts the previously harmful wavelength mismatch into a beneficial alignment. By selecting red LEDs whose wavelength matches the high-absorption region of silicon carbide, the system transforms what was previously energy-wasting blue light into efficiently absorbed red light, reducing power requirements and energy waste
3Productivity
If red LEDs emitting at 600-650 nm are used, then absorption efficiency and heating performance improve, but the system requires more specific component selection and calibration
Solution Approach 1:
The patent specifies a particular wavelength range (600-650 nm) for red LEDs to optimize absorption by silicon carbide. While this requires specific component selection, the benefit of dramatically improved heating efficiency justifies the additional calibration requirements. The parameter change targets the peak absorption region of silicon carbide
4Productivity
If LEDs are placed close to the substrate for efficient heating, then heating effectiveness improves, but the system has limited adjustment range and flexibility
Solution Approach 1:
The patent introduces collimating optics as an intermediary component between the red LED array and the silicon carbide substrate. These optics collimate the divergent light from LEDs, enabling the light to travel longer distances without significant intensity loss. This mediator allows the LED array to be positioned further from the substrate while maintaining effective heating, thereby increasing system flexibility and adjustment range
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 red LED system achieves faster and more efficient heating of silicon carbide substrates with reduced power requirements, improving coupling efficiency and reducing waste energy compared to traditional blue LED systems.
Implementation Method 1
the wavelengths emitted by blue LEDs are also readily absorbed by silicon... the absorption coefficient of silicon decreases with increasing wavelength... This wavelength is better absorbed by silicon carbide
Implementation Method 2
collimating optics are disposed between the LEDs and the silicon carbide substrate. The collimating optics may increase the allowable distance between the LEDs and the substrate
Implementation Method 3
a diffuser is disposed between the LEDs and the substrate
Data Source
AI summary
A system and method for heating silicon carbide substrates is disclosed. The system includes a heating element that utilizes LEDs that emit light at wavelengths between 600 nm and 650 nm. This wavelength is better absorbed by silicon carbide. In certain embodiments, collimating optics are disposed between the LEDs and the silicon carbide substrate. The collimating optics may increase the allowable distance between the LEDs and the substrate. In other embodiments, a diffuser is disposed between the LEDs and the substrate. In addition, a method of heating a substrate is disclosed. The relationship between absorption coefficient and wavelength is determined for the substrate. Based on this relationship, an optimal wavelength or range of wavelengths is selected. The substrate is then heated using an LED emitting light at the optimal wavelengths.