Quantum Dot Light-Emitting Element Cyclic Ligand Coordination
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Solution Overview
Problem
Conventional ligands coordinating quantum dots in light-emitting layers exhibit low carrier transportability, leading to reduced injection efficiency and luminous efficiency of the light-emitting layer.
Innovation Solution
Incorporating cyclic organic compounds, such as crown ether, hetero crown ether, benzo-crown ether, cryptand, calixarene, and cyclofan, which coordinate with quantum dots to enhance carrier injection efficiency and dispersibility, thereby improving the reliability and luminous efficiency of the light-emitting layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ligands are used to coordinate quantum dots, then dispersibility of quantum dots is improved and defects are inactivated, but carrier transportability is low resulting in reduced injection efficiency and luminous efficiency
Solution Approach 1:
The patent changes the chemical parameters of the ligand by introducing cyclic structures (crown ethers, cryptands, calixarenes) with specific functional groups. These structural modifications alter the electronic and steric properties of the ligand, enabling simultaneous achievement of good dispersibility and high carrier transportability, thus resolving the contradiction between stability and injection efficiency
Solution Approach 2:
The patent employs composite ligand structures that combine cyclic organic frameworks with coordinating functional groups. These composite structures integrate the dispersibility-enhancing cyclic skeleton with the carrier-transporting functional groups, achieving both stability improvement and enhanced carrier injection efficiency without compromise
2Quantity of substance
If conventional ligands are used to coordinate quantum dots, then dispersibility of quantum dots is improved, but luminous efficiency of the light-emitting layer decreases
Solution Approach 1:
The patent modifies ligand parameters by incorporating cyclic structures with specific atomic compositions and spatial arrangements. These changes optimize the ligand's ability to disperse quantum dots while minimizing energy loss pathways, thereby maintaining high luminous efficiency despite improved dispersibility
3Reliability
If conventional ligands are used to coordinate quantum dots, then defects in surfaces of quantum dots are inactivated, but carrier transportability is reduced
Solution Approach 1:
The patent applies local quality modification by designing ligands with distinct functional regions: cyclic structural portions that provide steric protection and defect passivation, and coordinated functional groups that facilitate carrier transport. This spatial differentiation of functions within the ligand structure resolves the contradiction between defect inactivation and carrier transportability
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 use of cyclic organic compounds improves carrier injection efficiency, enhances luminous efficiency, and maintains the inactivation of defects in the quantum dots, resulting in a more reliable light-emitting layer.
Implementation Method 1
at least some of atoms that form a ring of the cyclic organic compound are coordinated to the quantum dots
Data Source
AI summary
A light-emitting element includes: a first electrode; a second electrode; and a light-emitting layer between the first electrode and the second electrode, wherein the light-emitting layer includes quantum dots and a cyclic organic compound, and at least some of atoms that form a ring of the cyclic organic compound are coordinated to the quantum dots.