Quantum Dot Light-Emitting Element With Defect-Passivating Matrix
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Solution Overview
Problem
The durability of light-emitting elements is low due to the instability of quantum dots and the use of organic compounds that decompose easily, leading to reduced luminous efficiency and fluorescence resonance energy transfer.
Innovation Solution
A light-emitting element with a matrix material comprising an inorganic semiconductor and an additive that fills the space between quantum dots, forming a high concentration distribution region to inactivate lattice defects and improve durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organic compounds are used in the light-emitting element, then the manufacturing process is easier, but the durability and stability are low due to easy decomposition
Solution Approach 1:
The patent changes the material parameter from organic compounds to inorganic semiconductor materials in the matrix. This fundamental material substitution maintains manufacturability through established semiconductor processing techniques while dramatically improving durability and resistance to decomposition, directly resolving the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The patent creates a composite material system combining inorganic semiconductor matrix with quantum dots embedded within it. This composite structure leverages the stability of inorganic materials while incorporating the optoelectronic properties of quantum dots, achieving both durability and functional performance.
2Power
If quantum dots are used in the light-emitting element, then the luminous efficiency is improved, but the durability is reduced due to instability of quantum dots
Solution Approach 1:
The inorganic semiconductor matrix acts as an intermediary protective environment for the quantum dots. It provides structural support and stabilization to the quantum dots, preventing their degradation while maintaining their optoelectronic properties, thus preserving luminous efficiency while improving durability.
Solution Approach 2:
The composite structure of quantum dots embedded in an inorganic semiconductor matrix creates a synergistic system where the quantum dots provide high luminous efficiency and the inorganic matrix provides stability and durability, resolving the contradiction between performance and reliability.
3Ease of manufacture
If additive concentration is uniform throughout the matrix, then the manufacturing process is simpler, but the lattice defects remain active reducing durability
Solution Approach 1:
The patent applies local quality by creating a non-uniform distribution of additives within the inorganic semiconductor matrix. The additive concentration varies spatially, with higher concentrations positioned to specifically target and neutralize lattice defects in critical regions, thereby improving durability without significantly complicating the manufacturing process.
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 inorganic semiconductor matrix enhances the durability and luminous efficiency of the light-emitting element by preventing decomposition and reducing non-light-emission centers, resulting in improved external quantum efficiency.
Implementation Method 1
bringing a crystal growth rate of the inorganic semiconductor to equal to or less than a thermal diffusion rate of the additive
Implementation Method 2
modifying the precursor of the inorganic semiconductor into an inorganic semiconductor
Data Source
AI summary
A matrix material includes an inorganic semiconductor and an additive, fills a space between a first quantum dot and a second quantum dot, and includes a first portion adjacent to the first quantum dot, a second portion adjacent to the second quantum dot, and a third portion positioned between the first portion and the second portion and having a concentration of the additive higher than those of the first portion and the second portion.