Nitride Quantum Dot Light Emitting Device Nanorod Extraction
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Solution Overview
Problem
The existing methods for manufacturing nitride quantum dot light emitting devices face challenges due to limitations in using aluminum nitride templates, such as insulation characteristics and difficulty in forming efficient light emitting diodes with high luminance and broad wavelength range.
Innovation Solution
A light emitting device is designed with a substrate, a nitride-based buffer layer, vertically arranged nanorod layers, and nitride quantum dots, where the nanorod layers are spaced apart and covered by a top contact layer, and a method involving forming a metal thin film, modifying it into a quantum dot, and forming a top contact layer to enhance photo extraction efficiency and wavelength control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If aluminum nitride template substrate is used for quantum dot formation, then quantum dot structure can be obtained, but insulation characteristic prevents effective LED operation
Solution Approach 1:
The patent extracts the template function from the aluminum nitride substrate and transfers it to a sacrificial layer that is later removed. The AlN is used only for initial quantum dot nucleation and growth, then completely removed by selective etching, leaving behind suspended quantum dots on the nanorod array without insulation problems.
Solution Approach 2:
The patent performs preliminary quantum dot formation on the AlN template before removing the template. The quantum dots are nucleated and grown to desired size and distribution while the AlN provides structural support, then the AlN is removed after serving its template purpose.
2Ease of manufacture
If quantum well structure is used in small pixel LED, then device can be manufactured, but light emission efficiency is insufficient
Solution Approach 1:
The patent transitions from two-dimensional quantum well structures to zero-dimensional quantum dot structures. The quantum dots are arranged in vertically suspended nanorod arrays, creating a three-dimensional configuration that enhances light extraction efficiency while maintaining small pixel size.
Solution Approach 2:
The patent creates localized quantum dot structures with specific size and composition control within each pixel. The quantum dots are individually positioned on nanorod tips, allowing precise control of emission characteristics while maintaining overall device miniaturization.
3Reliability
If conventional LED structure is used, then device can operate, but photo extraction efficiency is limited
Solution Approach 1:
The patent uses vertically oriented nanorod structures with curved surfaces that enhance light extraction through multiple internal reflections. The nanorod geometry creates favorable optical paths that reduce total internal reflection and improve photo extraction efficiency compared to flat conventional structures.
Solution Approach 2:
The patent creates a composite structure combining nanorod arrays with quantum dots, where the nanorods provide mechanical support and optical enhancement while the quantum dots provide light emission. The suspended configuration combines multiple materials and structures to achieve superior photo extraction.
4Device complexity
If narrow wavelength range LED is used, then device structure is simple, but display quality and flexibility are limited
Solution Approach 1:
The patent controls quantum dot emission wavelength by changing composition parameters (indium gallium nitride ratios) and size parameters of the quantum dots. By adjusting these parameters during growth, different emission wavelengths can be achieved from the same nanorod platform structure.
Solution Approach 2:
The patent creates a universal nanorod platform that can support quantum dots with different emission wavelengths. The same nanorod growth and quantum dot formation process can produce blue, green, red, or other wavelength emissions by adjusting quantum dot composition, making the structure multi-functional for various display applications.
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 solution increases photo extraction efficiency and allows for light emission across a broad wavelength range, enabling high luminance and flexible display applications, with the ability to emit blue, green, and red colors by adjusting indium and gallium content in the nitride quantum dots.
Implementation Method 1
a light emitting device having a nitride quantum dot and a method of manufacturing the same
Implementation Method 2
Research on a light source with a small size and on a quantum dot (QD) have been actively performed because the QD has a higher efficiency than a quantum well (QW) in a small light emitting device
Implementation Method 3
the plurality of nanorod layers being spaced apart from each other; a nitride quantum dot (QD) arranged on the plurality of nanorod layers
Data Source
AI summary
Provided are a light emitting device having a nitride quantum dot and a method of manufacturing the same. The light emitting device may include: a substrate; a nitride-based buffer layer arranged on the substrate; a plurality of nanorod layers arranged on the nitride-based buffer layer in a vertical direction and spaced apart from each other; a nitride quantum dot arranged on each of the plurality of nanorod layers; and a top contact layer covering the plurality of nanorod layers and the nitride quantum dots. A pyramid-shaped material layer may be further included between each of the plurality of nanorod layers and each of the nitride quantum dots. One or the plurality of nitride quantum dots may be arranged on each of the nanorod layers.