GaN {20-21} Laser Diode Structure for Low-Voltage Light Emission
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Solution Overview
Problem
Existing optical devices, such as conventional light bulbs and early laser technologies, face inefficiencies in energy conversion, reliability issues due to thermal expansion, and limitations in directional light emission, making them unsuitable for applications requiring focused or high-efficiency light.
Innovation Solution
The development of a low voltage laser device using a gallium and nitrogen containing substrate configured on the {20-21} family of planes or off-cuts, which eliminates the need for aluminum bearing cladding regions and incorporates thin barrier layers in the multi-quantum well active region to achieve efficient electromagnetic radiation emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional light bulbs use tungsten filament, then light emission is achieved, but energy efficiency deteriorates with more than 90% energy loss as thermal energy
Solution Approach 1:
The patent replaces the thermal radiation mechanism of tungsten filaments with electroluminescence in semiconductor laser diodes. The active region uses quantum well structures where electron-hole recombination directly generates photons, eliminating the need for thermal heating and achieving significantly higher energy efficiency in converting electrical energy to light.
Solution Approach 2:
The invention employs composite semiconductor structures including GaN-based quantum wells separated by AlGaN barrier layers. This composite material system enables efficient carrier confinement and radiative recombination, achieving high energy conversion efficiency while maintaining structural stability and directing light emission.
2Stability of the object's composition
If aluminum bearing cladding regions are used in laser devices, then structural stability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates aluminum-bearing cladding regions from the laser device structure. Instead of using AlGaN cladding layers, the invention employs GaN-based cladding structures that maintain structural stability while simplifying the manufacturing process and reducing material complexity.
Solution Approach 2:
The invention changes the compositional parameters of the cladding regions from aluminum-containing alloys to pure GaN or GaN-based structures. This parameter change maintains the structural stability needed for laser operation while eliminating the manufacturing complexities associated with aluminum incorporation and phase control.
3Power
If conventional lasers use flash lamp pumping, then laser output is achieved, but wall plug efficiency deteriorates to less than 0.1%
Solution Approach 1:
The patent replaces the optical pumping mechanism of flash lamps with direct electrical injection pumping. The laser diode structure allows electrical current to directly excite carriers in the quantum well active region, eliminating the intermediate optical conversion step and achieving wall plug efficiencies greater than 50%.
Solution Approach 2:
The invention enables continuous electrical-to-optical energy conversion through direct carrier injection and radiative recombination in the quantum well structure. This continuous process eliminates the pulsed nature of lamp pumping and maintains high efficiency throughout operation, with wall plug efficiency exceeding 50%.
4Illumination intensity
If conventional lasers use gas discharge mechanisms, then directional light emission is achieved, but device size and cost increase significantly
Solution Approach 1:
The patent employs thin-film semiconductor heterostructure layers in the micrometer scale to achieve laser emission. The quantum well active region and cladding layers form a compact planar structure that provides directional light emission without the bulky gas discharge components, reducing device size to a fraction of conventional laser dimensions.
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 approach enables the creation of optical devices with improved efficiency, reliability, and directional light emission, specifically achieving low voltage operation and high output power without the drawbacks of aluminum-containing cladding regions.
Implementation Method 1
low voltage laser device using a gallium and nitrogen containing substrate configured on the {20-21} family of planes
Data Source
AI summary
A low voltage laser device having an active region configured for one or more selected wavelengths of light emissions.