Nanorod LED Central Current Path for Surface Defect Loss
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Solution Overview
Problem
Microscale and nanoscale LEDs experience decreased luminous efficiency due to surface defects when their size is reduced, leading to interrupted current flow and reduced performance.
Innovation Solution
A nanorod light-emitting device with a centralized current passage structure, featuring a first and second semiconductor layer, an emission layer, a conductive layer, and a current blocking layer, which concentrates current to the center portion of the nanorod, preventing surface defects and enhancing luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the size of LED is decreased to microscale or nanoscale, then the miniaturization is achieved, but the luminous efficiency decreases due to surface defects
Solution Approach 1:
The patent divides the current flow path into distinct regions: a central current passage region and peripheral current blocking regions. This segmentation allows current to be confined to the center portion of the nanorod, avoiding surface defects at the periphery while maintaining miniaturization benefits
Solution Approach 2:
The patent applies different properties to different regions of the nanorod structure. The central region has high electrical conductivity to concentrate current flow, while the peripheral regions have low electrical conductivity (current blocking) to prevent current from reaching defective surface areas. This local differentiation resolves the contradiction between miniaturization and luminous efficiency
2Length of moving object
If the size of LED is decreased to microscale or nanoscale, then the miniaturization is achieved, but the current flow is interrupted due to surface defects
Solution Approach 1:
The patent segments the nanorod structure into a central conductive core and peripheral blocking regions. This segmentation creates a dedicated current passage channel that is isolated from surface defects, ensuring continuous current flow even at microscale and nanoscale dimensions
Solution Approach 2:
The patent introduces an intermediary current blocking layer that acts as a barrier between the current flow path and the defective surface regions. This intermediary structure prevents direct interaction between current and surface defects, maintaining current flow continuity in miniaturized devices
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 centralized current passage structure in the nanorod light-emitting device effectively reduces surface defects, improving luminous efficiency while maintaining a small size and large aspect ratio, thereby enhancing the performance of microscale and nanoscale LEDs.
Implementation Method 1
a current blocking layer surrounding a sidewall of the conductive layer
Implementation Method 2
a conductive layer disposed between at least one of a center portion of a lower surface of the emission layer and the first semiconductor layer and a center portion of an upper surface of the emission layer and the second semiconductor layer
Implementation Method 3
an emission layer disposed above the first semiconductor layer
Data Source
AI summary
Provided is a nanorod light-emitting device including a first semiconductor layer doped with a first conductive type impurity, an emission layer disposed above the first semiconductor layer, a second semiconductor layer disposed above the emission layer and doped with a second conductive type impurity that is electrically opposite to the first conductive type impurity, a conductive layer disposed between at least one of a center portion of a lower surface of the emission layer and the first semiconductor layer and a center portion of an upper surface of the emission layer and the second semiconductor layer, and a current blocking layer surrounding a sidewall of the conductive layer.