Nano-structured LED with Flat Nanocore Surface
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Solution Overview
Problem
Current semiconductor light-emitting devices, particularly 3D LED structures with nano pyramids, suffer from low luminescent efficiency due to electrical current concentration at the top, leading to limited light emission from the sides.
Innovation Solution
A nano-structured light-emitting device with a hexagonal prismoid-shaped nanocore and active layer, surrounded by a conductive layer, which includes a flat upper surface to distribute electrical current evenly across the sides, enhancing luminescent efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a 3D nano pyramid structure is used to increase light-emitting area, then the light-emitting area increases, but electrical current concentrates at the top leading to reduced luminescent efficiency
Solution Approach 1:
The patent applies asymmetry by transitioning from a symmetric nano pyramid structure to an asymmetric nanorod structure with a flat upper surface. This asymmetric geometry prevents electrical current concentration at the apex while maintaining increased light-emitting area, thereby resolving the contradiction between area expansion and efficiency preservation
Solution Approach 2:
The patent employs dimensionality change by extending the light-emitting structure from a 2D planar configuration to a 3D nanorod structure with significant height. This vertical extension increases the light-emitting area while the flat upper surface geometry ensures uniform current distribution throughout the structure, preventing energy loss
2Illumination intensity
If electrical current is injected into a nano pyramid structure, then light emission occurs, but current concentration at the top limits light emission from sides
Solution Approach 1:
The asymmetric nanorod geometry with flat upper surface creates multiple current injection pathways along the sides rather than concentrating current at a single apex point. This asymmetric structure enables uniform current distribution while maintaining strong light emission from all surfaces
Solution Approach 2:
The nanorod structure effectively segments the current injection process into multiple distributed contact points along the sides and base, rather than a single concentrated point at the top. This segmentation of current injection paths enables uniform current distribution across the entire structure, facilitating ease of operation
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 design improves luminescent efficiency by ensuring even current distribution across the sides of the nano structure, increasing the light-emission area and reducing concentration at the top, thereby enhancing the overall light output.
Implementation Method 1
A semiconductor light-emitting device such as a light emitting diode (LED) or a laser diode (LD) employs electroluminescence, that is, light emission from a semiconductor material according to application of electrical current or a voltage.
Data Source
AI summary
A nano-structured light-emitting device including a first semiconductor layer; a nano structure formed on the first semiconductor layer. The nano structure includes a nanocore, and an active layer and a second semiconductor layer that are formed on a surface of the nanocore, and of which the surface is planarized. A conductive layer surrounds sides of the nano structure, a first electrode is electrically connected to the first semiconductor layer and a second electrode is electrically connected to the conductive layer.