Strained Semiconductor Islands for Multi-Wavelength LED Manufacturing
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Solution Overview
Problem
Current methods for manufacturing optoelectronic devices, such as micro-display screens, face challenges in producing LEDs that emit different wavelengths using the same technology and substrate, as materials with varying properties require complex assembly and energy-consuming phosphorescent conversion, leading to reduced efficiency and increased complexity.
Innovation Solution
A method for manufacturing crystalline semiconductor islands with varying lattice parameters on a single substrate, involving the formation of strained elementary layers, heat treatment to relax the islands, and transferring them to a growth medium, allowing for the collective production of LEDs emitting different wavelengths without the need for phosphorescent conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different materials are used to manufacture LEDs emitting at various wavelengths, then the emission wavelengths can be achieved, but the device complexity and manufacturing complexity increase significantly
Solution Approach 1:
The patent applies local quality by creating different strain levels in specific regions of the semiconductor layer. By controlling the strain distribution locally, LEDs with different emission wavelengths are formed in different areas of the same substrate, allowing wavelength diversity without requiring different materials or complex assembly processes
Solution Approach 2:
The patent changes physical parameters (strain level, thickness) of the semiconductor layer to control emission wavelength. By adjusting the strain parameter in different regions, LEDs emitting at various wavelengths are produced on the same substrate, eliminating the need for multiple material systems and simplifying manufacturing
2Adaptability or versatility
If phosphorescent conversion is used to achieve different emission wavelengths from identical LEDs, then wavelength diversity is achieved, but light energy is consumed and manufacturing complexity increases
Solution Approach 1:
The patent performs preliminary action by incorporating different strain levels directly into the LED structure during manufacturing. This pre-configures the LEDs to emit at different wavelengths from the outset, eliminating the need for subsequent phosphorescent conversion and the associated energy losses
3Adaptability or versatility
If phosphorescent materials are dispensed on LED emitting surfaces to achieve color conversion, then wavelength diversity is achieved, but the manufacturing method becomes more complex
Solution Approach 1:
The patent extracts the need for phosphorescent materials entirely by achieving wavelength diversity through strain-controlled direct emission. This removes the complex dispensing and alignment steps required for phosphorescent conversion, simplifying the manufacturing process while maintaining color emission capability
4Productivity
If identical LEDs are manufactured on the same substrate to simplify production, then manufacturing efficiency improves, but the ability to emit different wavelengths is lost
Solution Approach 1:
The patent applies local quality by introducing spatial variations in strain level across the substrate. This allows identical LED structures to emit at different wavelengths depending on their location, maintaining manufacturing efficiency while achieving wavelength diversity
Solution Approach 2:
The patent changes the strain parameter in different regions of the substrate to enable wavelength variety. By controlling physical parameters during a single manufacturing process, the patent achieves both high productivity and emission versatility
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
Enables the efficient and simplified production of optoelectronic devices with distinct light properties using a single manufacturing technology, improving efficiency and reducing complexity by directly emitting light across multiple wavelengths on a single substrate.
Implementation Method 1
heat-treating the relaxation substrate at a relaxation temperature greater than or equal to the glass transition temperature of the flow layer to cause differentiated lateral expansion of the islands of the first and second group
Implementation Method 2
heat-treating the relaxation substrate at a relaxation temperature greater than or equal to the glass transition temperature of the flow layer
Data Source
AI summary
A method for manufacturing a plurality of crystalline semiconductor islands having a variety of lattice parameters includes the following steps: providing a relaxation substrate that comprises a medium, a flow layer disposed on the medium and, a plurality of strained crystalline semiconductor islands having an initial lattice parameter located on the flow layer, a first group of islands having a first lattice parameter and a second group of islands having a second lattice parameter that is different from the first; and heat treating the relaxation substrate at a relaxation temperature greater than or equal to the glass transition temperature of the flow layer to cause differentiated lateral expansion of the islands of the first and second group. The lattice parameter of the relaxed islands of the first group and the relaxed islands of the second group then have different values.