Nanorod LED Porous Quantum Dot Structure for Luminous Efficiency
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Solution Overview
Problem
The luminous efficiency of LEDs deteriorates when they are miniaturized to micro or nano units, despite their advantages in lifespan, power consumption, and response speed.
Innovation Solution
A nanorod light-emitting device is designed with an n-type semiconductor layer featuring a core rod and radially or vertically arranged nano pores, where quantum dots are dispersed to convert blue light into red light, enhancing luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If LEDs are miniaturized to micro or nano units, then device size is reduced, but luminous efficiency deteriorates
Solution Approach 1:
The patent introduces a porous layer containing numerous pores (nanoscale voids) within the light-emitting device structure. These pores are filled with quantum dots that convert light wavelengths. The porous structure increases the surface area and light interaction volume without significantly increasing the overall device volume, thereby maintaining high luminous efficiency even at miniaturized scales.
Solution Approach 2:
The patent employs a composite structure combining multiple materials: a porous matrix material, quantum dots (semiconductor nanoparticles), and surrounding functional layers. This composite approach allows the quantum dots to efficiently convert light within the confined pore spaces, achieving high luminous efficiency in a compact nanoscale device configuration.
2Loss of energy
If quantum dots are dispersed in nano pores, then color conversion efficiency is improved, but device structure complexity increases
Solution Approach 1:
The patent segments the light conversion function into discrete quantum dots distributed within porous structures. Each pore acts as an independent compartment containing quantum dots, allowing the conversion function to be distributed throughout the material rather than concentrated in a single complex component. This segmentation simplifies the overall device architecture while maintaining high conversion efficiency.
Solution Approach 2:
The patent applies local quality by concentrating quantum dots specifically within the pores of the porous layer, where they can efficiently interact with incident light. The surrounding matrix material provides structural support and optical pathways, while the quantum-dot-filled pores provide the conversion function. This localized arrangement optimizes performance without requiring complex integration throughout the entire device.
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 luminous efficiency by utilizing quantum dots for color conversion, maintaining efficiency even at nano scales, and securing external quantum efficiency of 10% or more.
Implementation Method 1
The plurality of quantum dots may be configured to convert blue light emitted by the active layer into red light
Data Source
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AI summary
A nanorod light-emitting device includes an n-type semiconductor layer, an active layer on the n-type semiconductor layer, and a p-type semiconductor layer on the active layer, and the n-type semiconductor layer includes a core rod, a plurality of nano pores opened in an outward direction from the core rod, and a plurality of quantum dots dispersed in the plurality of nano pores.