Triple-Layer Semiconductor Nanoparticles for Enhanced Emission
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Solution Overview
Problem
Conventional core/shell type nanosized semiconductors fail to achieve superior optical characteristics, specifically in terms of emission efficiency and continuous emission life.
Innovation Solution
Triple-layer semiconductor nanoparticles and nanorods with a core, intermediate, and shell layer, where the shell layer has a greater band gap than the core layer, and the intermediate layer's lattice constant is between that of the core and shell layers, enhancing lattice compatibility and reducing defects, thereby improving optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional core/shell type nanoparticle is used, then the structure is simple and easy to manufacture, but the emission efficiency and continuous emission life are insufficient
Solution Approach 1:
The patent divides the nanoparticle into three distinct layers (core, intermediate, and shell) instead of the conventional two-layer structure. This segmentation allows each layer to serve specific functions: the core provides the base optical properties, the intermediate layer reduces lattice mismatch, and the shell enhances emission efficiency, thereby resolving the contradiction between structural simplicity and emission performance.
Solution Approach 2:
The intermediate layer acts as a mediator between the core and shell layers. It has a lattice constant that is intermediate between those of the core and shell materials, which reduces lattice mismatch and interface defects. This intermediary layer enables better optical characteristics without requiring a complete redesign of the entire nanoparticle system.
2Reliability
If the lattice constant mismatch between core and shell layers is large, then the manufacturing process is simpler, but the emission characteristics deteriorate due to increased defects
Solution Approach 1:
The intermediate layer serves as a lattice constant bridge between the core and shell materials. By selecting materials with intermediate lattice constants for the intermediate layer, the patent reduces the overall lattice mismatch in the system, thereby reducing interface defects and improving emission characteristics without significantly complicating the manufacturing process.
Solution Approach 2:
The patent systematically varies the lattice constant parameter by selecting specific materials for each layer. The intermediate layer's lattice constant is specifically chosen to be between those of the core and shell, creating a gradient that minimizes defect formation while maintaining manufacturability through controlled material selection.
3Reliability
If a triple-layer structure with intermediate layer is implemented, then the emission efficiency and continuous emission life are enhanced, but the manufacturing complexity increases
Solution Approach 1:
The nanoparticle is segmented into three functional layers, each with specific compositional and structural characteristics. This segmentation enables the system to achieve superior emission efficiency and continuous emission life by assigning specific roles to each layer while maintaining a systematic manufacturing approach.
Solution Approach 2:
The patent employs composite material design by combining different semiconductor materials in a triple-layer configuration. The core, intermediate, and shell layers use different material compositions optimized for their specific functions, creating a composite structure that achieves enhanced optical properties while following established nanomaterial synthesis protocols.
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 triple-layer structure results in enhanced emission efficiency and longer continuous emission life compared to conventional core/shell semiconductors, with specific examples showing improved emission intensity and life by factors ranging from 1.2 to 2.5.
Implementation Method 1
a lattice constant of a crystal forming the intermediate layer being a value between a lattice constant of the crystal forming the core layer and that of the crystal forming the shell layer
Implementation Method 2
nano-sized semiconductors such as semiconductor nanoparticles or semiconductor nanorods displays, which are nanosized, display quantum size effects such as an increase of band gap energy or the confinement effect of exciton
Implementation Method 3
a crystal forming the shell layer having a band gap greater than that of a crystal forming the core layer
Data Source
AI summary
A semiconductor nanoparticle and semiconductor nanorod that have optical characteristics (luminescence intensity and emission lifetime) superior to those of conventional core/shell nanosized semiconductors. There are provided a triple-layer semiconductor nanoparticle, and triple-layer semiconductor nanorod, having an average particle diameter of 2 to 50 nm and comprising a core layer, an interlayer and a shell layer, wherein the layers are composed of different crystals, and wherein the crystal constructing the shell layer exhibits a band gap greater than that of the crystal constructing the core layer, and wherein the crystal constructing the interlayer has a lattice constant assuming a value between those of the crystal constructing the core layer and the crystal constructing the shell layer.