Nanorod LED Current Blocking Around Sidewall Defects
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Solution Overview
Problem
Surface defects in micro- or nano-scale LEDs can lead to reduced luminous efficiency due to current flowing near defective areas, which affects the performance of micro- or nano-LEDs used in display devices.
Innovation Solution
A nanorod light-emitting device with a centralized current path structure, featuring a first semiconductor layer, a light-emitting layer, a second semiconductor layer, conductive layers, current blocking layers, and an insulating film to prevent current from flowing to the sides of the nanorods, thereby concentrating current in the central defect-free region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current flows through the entire cross-section of the nanorod including side regions, then the current path area is maximized, but surface defects in the side regions reduce luminous efficiency
Solution Approach 1:
The current path is segmented into a central region and side regions. The central conductive layer is positioned only in the central portion of the light-emitting layer, while current blocking layers are positioned in the side regions to prevent current flow. This segmentation allows the current to flow only through the defect-free central region, improving luminous efficiency without requiring complex overall device restructuring
Solution Approach 2:
Different regions of the light-emitting layer are given different functional qualities: the central region is designed to conduct current (with a central conductive layer), while the side regions are designed to block current (with current blocking layers). This local differentiation ensures that current flows only through the high-quality central region, avoiding surface defects in the side regions, thereby improving luminous efficiency
2Reliability
If current is concentrated in the central portion only, then luminous efficiency is improved by avoiding surface defects, but the current path area is reduced
Solution Approach 1:
Instead of allowing current to flow through the entire cross-section (excessive action), the current is restricted to flow only through the central portion (partial action). The current blocking layers in the side regions prevent excessive current distribution, while the central conductive layer ensures sufficient current flow through the defect-free central region, maintaining energy efficiency and improving luminous efficiency
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 configuration enhances the luminous efficiency of the nanorod light-emitting devices by ensuring current flows only through central portions with minimal surface defects, improving overall performance.
Implementation Method 1
an insulating film that surrounds a side surface of the second semiconductor layer, a side surface of the light-emitting layer, and a side surface of the at least one current blocking layer
Implementation Method 2
at least one conductive layer disposed between a central portion of a lower surface of the light-emitting layer and the first semiconductor layer
Data Source
AI summary
A nanorod light-emitting device is provided. The nanorod light-emitting device includes a first semiconductor layer, a light-emitting layer on the first semiconductor layer, a second semiconductor layer disposed on the light-emitting layer, at least one conductive layer disposed between a central portion of a lower surface of the light-emitting layer and the first semiconductor layer, or between a central portion of an upper surface of the light-emitting layer and the second semiconductor layer, at least one current blocking layer that surrounds a side surface of the at least one conductive layer, and an insulating film that surrounds a side surface of the second semiconductor layer, a side surface of the light-emitting layer, and a side surface of the at least one current blocking layer.