Quantum Dot Composition with Thermal Decomposition Auxiliary Compound
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Solution Overview
Problem
Current quantum dot-based light emitting elements face challenges in achieving high luminous efficiency and service life due to poor dispersibility and charge injection property degradation, primarily because of the organic ligands bonded to the quantum dots.
Innovation Solution
A quantum dot composition is developed that includes a quantum dot with a ligand bonded to its surface and a thermal decomposition auxiliary compound, such as an azo compound, which is used to form a light emitting element by heating the composition, allowing for the removal of the ligand's tail portion and improving the dispersibility and capping properties of the quantum dots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If quantum dots with organic ligands are used, then dispersibility is improved, but luminous efficiency and service life deteriorate due to charge injection property degradation
Solution Approach 1:
The patent extracts only the necessary part of the ligand (the head portion that provides dispersibility) while removing the harmful part (the tail portion that causes charge injection degradation). This is achieved through controlled thermal decomposition that selectively eliminates the ligand tail portion, retaining the beneficial dispersibility function while eliminating the harmful charge injection interference.
Solution Approach 2:
The patent changes the chemical state of the ligand through thermal decomposition, transforming it from a complete organic ligand (with both head and tail portions) to a modified state where only the head portion remains bonded to the quantum dot surface. This parameter change in the ligand structure resolves the contradiction by maintaining dispersibility while eliminating charge injection degradation.
2Reliability
If ligands are removed completely from quantum dots, then charge injection properties are improved, but dispersibility deteriorates
Solution Approach 1:
Instead of removing the entire ligand, the patent selectively extracts only the harmful tail portion while preserving the beneficial head portion. This partial extraction maintains the dispersibility function provided by the head portion while removing the charge injection degradation caused by the tail portion, achieving both improved charge injection and maintained dispersibility.
3Reliability
If quantum dots are evenly distributed in emission layer, then luminous efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent performs preliminary action by modifying the ligand structure before the quantum dots are incorporated into the emission layer. The thermal decomposition auxiliary compound is added to the quantum dot composition in advance, so that when the emission layer is formed, the ligand tail portions are already decomposed and removed, enabling automatic even distribution of quantum dots without requiring complex additional manufacturing steps.
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
This approach enhances the luminous efficiency and service life of the light emitting element by ensuring even distribution of quantum dots and maintaining charge injection properties, resulting in lower driving voltage and improved luminance.
Implementation Method 1
a thermal decomposition auxiliary compound, such as an azo compound, which is used to form a light emitting element by heating the composition, allowing for the removal of the ligand's tail portion
Data Source
AI summary
A quantum dot composition includes a quantum dot having a surface to which a ligand is bonded, and a thermal decomposition auxiliary compound. The quantum dot composition may be applied to an emission layer of a light emitting element and a display device, thereby improving luminous efficiency of the light emitting element and the display device.