Quantum Dot Electroluminescence Panel Ligand Exchange
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Quantum dot electro-luminescence display panels have low luminescence efficiency due to long organic chains blocking hole and electron movement, which hinders recombination and reduces brightness and efficiency.
Innovation Solution
The use of a quantum dot light-emitting layer in an electro-luminescence structure with a hole transport layer made of poly(3,4-ethylenedioxy thiophene)-poly(styrene sulfonic acid) and a hole barrier layer of 1,3,5-tri(1-phenyl-1H-benzimidazole-2-yl) benzene, along with a post-treatment using 3-mercaptopropionic acid in acetonitrile to improve carrier mobility and recombination efficiency, replaces the traditional color filter film for enhanced brightness and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum dots are coated with long organic chains, then the quantum dots are stable and easy to process, but the movement of holes and electrons is blocked and luminescence efficiency is reduced
Solution Approach 1:
The patent extracts and removes the long organic chains from the quantum dot surface through a post-treatment process using short-chain ligands. This extraction eliminates the harmful blocking effect on charge carrier movement while maintaining quantum dot stability through the remaining short-chain ligands, thereby resolving the contradiction between stability and luminescence efficiency.
Solution Approach 2:
The patent changes the ligand chain length parameter from long to short through chemical treatment. By controlling the ligand chain length parameter, the quantum dots achieve both stability (through sufficient ligand coverage) and high luminescence efficiency (through minimal blocking of charge carrier movement), resolving the technical contradiction.
2Device complexity
If traditional color filter films are used to realize primary colors, then the display structure is simple, but the transmittance is low and brightness is reduced
Solution Approach 1:
The patent replaces the passive optical filtering mechanism (color filter films) with an active electroluminescence mechanism (quantum dot light-emitting layer). This substitution eliminates the need for separate color filter components, simplifying the overall structure while dramatically improving brightness through direct light emission from the quantum dots themselves.
3Illumination intensity
If quantum dot light-emitting layer is used to replace color filter film, then transmittance and brightness are improved, but luminescence efficiency is initially low due to long organic chains
Solution Approach 1:
The patent applies a post-treatment process to the quantum dot light-emitting layer before final device operation. This preliminary action (ligand exchange treatment) modifies the quantum dot surface properties in advance, removing long organic chains and replacing them with short-chain ligands, thereby preparing the quantum dots for high-efficiency luminescence while maintaining their brightness-enhancing properties.
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 configuration increases luminous efficiency, reduces power consumption, and stabilizes color coordinates, resulting in improved brightness and color gamut while avoiding color aberration and power consumption reduction.
Implementation Method 1
OLED (Organic Light Emitting Diode) using the electro-fluorescence phenomenon can replace the color filter film
Implementation Method 2
the hole transport layer is made of a material comprising poly (3,4-ethylenedioxy thiophene)-poly (styrene sulfonic acid)
Implementation Method 3
the electro-luminescence structure further comprises a hole barrier layer provided between the quantum dot light-emitting layer and the cathode
Data Source
AI summary
Embodiments of the disclosure provide an electro-luminescence display panel and a fabrication method thereof, and a display device. The electro-luminescence display panel comprises a plurality of light-emitting units. Each light-emitting unit comprises a plurality of sub light-emitting units for displaying different colors, an electro-luminescence structure is provided in each of the sub light-emitting units, and the electro-luminescence structure comprises a quantum dot light-emitting layer.