Nanorod LED Multi-Quantum Well Structure for Miniaturization Loss
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Solution Overview
Problem
Miniaturization of LEDs to micro or nano units leads to a decrease in light emission efficiency.
Innovation Solution
A nanorod light-emitting device is developed, comprising a support layer, a first-type semiconductor nanocore, a mask layer, a light-emitting layer with a multi-quantum well structure, and a second-type semiconductor layer, which together enhance light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If LEDs are miniaturized to micro or nano units, then the size of the light-emitting device is reduced, but the light emission efficiency decreases
Solution Approach 1:
The light-emitting layer is divided into multiple quantum wells arranged in sequence, creating discrete light-emitting regions within the nanorod structure. This segmentation allows for optimized light emission at each interface while maintaining the overall miniaturized form factor, thereby improving light emission efficiency despite the reduced size.
Solution Approach 2:
The patent transitions from conventional planar LED structures to a vertical nanorod configuration with multi-quantum wells arranged along the vertical axis. This dimensional change enables efficient light emission in a compact volume by utilizing the vertical dimension for multiple light-emitting interfaces, thus maintaining high efficiency while achieving miniaturization.
2Loss of energy
If a multi-quantum well structure is implemented, then light emission efficiency is improved, but device complexity increases
Solution Approach 1:
Multiple quantum wells are merged into a single vertical nanorod structure, integrating multiple light-emitting functions within one compact component. This merging approach achieves high light emission efficiency through multiple interfaces while avoiding the complexity of assembling separate devices, as the entire multi-quantum well structure is formed as an integrated nanorod.
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 nanorod light-emitting device achieves improved light emission efficiency, with an internal quantum efficiency greater than 20%, even when emitting red light.
Implementation Method 1
a first-type semiconductor nanocore protruding from an upper surface of the support layer and including a semiconductor material doped as a first conductivity type, a mask layer on an upper surface of the support layer and extending to a first height of the first-type semiconductor nanocore in a vertical direction and adjacent to a surface of the first-type semiconductor nanocore, a light-emitting layer having a multi-quantum well structure adjacent to a portion of the first-type semiconductor nanocore above the first height in the vertical direction, and a second-type semiconductor layer adjacent to a surface of the light-emitting layer and including a semiconductor material doped as a second conductivity type
Data Source
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AI summary
Provided is a nanorod light-emitting device including a support layer, a first-type semiconductor nanocore protruding from an upper surface of the support layer and including a semiconductor material doped as a first conductivity type, a mask layer on an upper surface of the support layer and extending to a first height of the first-type semiconductor nanocore in a vertical direction and adjacent to a surface of the first-type semiconductor nanocore, a light-emitting layer having a multi-quantum well structure adjacent to a portion of the first-type semiconductor nanocore above the first height in the vertical direction, and a second-type semiconductor layer adjacent to a surface of the light-emitting layer and including a semiconductor material doped as a second conductivity type.