Light Emitting Device Multiple Quantum Wells
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Achieving high-order light emission in super luminescent diodes without increasing current injection density, which can lead to shorter device life due to high current requirements.
Innovation Solution
A light emitting device with multiple quantum-confined structures, including a first and second quantum well structure where the high-order energy level is substantially matched to the ground energy level, allowing for light emission with reduced current injection density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high current injection density is applied to achieve high-order light emission, then light emission intensity is improved, but device life is reduced
Solution Approach 1:
The patent changes the energy level parameters of the quantum-confined structures by adjusting well depth and width to achieve substantial matching between E1 and E2, enabling high-order light emission at lower current injection densities and extending device life
Solution Approach 2:
The active layer is segmented into multiple quantum-confined structures with different energy levels (ground level E0, high-order level E1 in first structure; ground level E2 in second structure), allowing selective population of energy levels and reduced current requirements for high-order emission
2Adaptability or versatility
If single quantum well structure with multiple energy levels is used to increase wavelength band, then emission spectrum width is improved, but current injection density must be increased
Solution Approach 1:
The active layer is divided into multiple quantum-confined structures, each contributing different energy levels to the emission spectrum. This segmentation enables wide spectrum coverage through multiple transitions without requiring high current injection density in a single structure
Solution Approach 2:
The patent extends the energy level structure by adding a second quantum-confined structure with ground level E2 that matches E1, creating an additional dimension in the energy level hierarchy. This enables multiple emission pathways (E0→E1, E1→E2, E2→higher levels) that broaden the emission spectrum while distributing current requirements across multiple transitions
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 high-order light emission with lower current injection density, potentially extending the life of the light emitting device and improving emission intensity in a wide wavelength band.
Implementation Method 1
the active layer has a plurality of quantum-confined structures, and a first quantum-confined structure has a ground level having an energy level E0 and a high-order level having an energy level E1
Implementation Method 2
light is emitted by injection of electric current to the active layer through the upper electrode layer and the lower electrode layer
Data Source
AI summary
The present invention provides a light emitting device which emit light having a high-order level without increasing a current injection density to an active layer. A light emitting device according to the present invention includes an upper electrode layer, a lower electrode layer, and an active layer provided between them. In this case, light is emitted by injection of electric current to the active layer through the upper electrode layer and the lower electrode layer, the active layer has a plurality of quantum-confined structures, and a first quantum-confined structure has a ground level having an energy level E0 and a high-order level having an energy level E1, and a second quantum-confined structure has an energy level E2 which is higher than the E0, and the E1 and the E2 are substantially matched.